Imported existing code
This commit is contained in:
Hazim Gazov
329
libraries/include/boost/proto/context/callable.hpp
Normal file
329
libraries/include/boost/proto/context/callable.hpp
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@@ -0,0 +1,329 @@
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#ifndef BOOST_PP_IS_ITERATING
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///////////////////////////////////////////////////////////////////////////////
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/// \file callable.hpp
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/// Definintion of callable_context\<\>, an evaluation context for
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/// proto::eval() that explodes each node and calls the derived context
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/// type with the expressions constituents. If the derived context doesn't
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/// have an overload that handles this node, fall back to some other
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/// context.
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//
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// Copyright 2008 Eric Niebler. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_PROTO_CONTEXT_CALLABLE_HPP_EAN_06_23_2007
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#define BOOST_PROTO_CONTEXT_CALLABLE_HPP_EAN_06_23_2007
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#include <boost/proto/detail/prefix.hpp> // must be first include
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#include <boost/config.hpp>
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#include <boost/detail/workaround.hpp>
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#include <boost/preprocessor/cat.hpp>
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#include <boost/preprocessor/iteration/iterate.hpp>
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#include <boost/preprocessor/facilities/intercept.hpp>
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#include <boost/preprocessor/repetition/repeat.hpp>
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#include <boost/preprocessor/repetition/enum_params.hpp>
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#include <boost/preprocessor/repetition/enum_trailing.hpp>
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#include <boost/preprocessor/repetition/enum_trailing_params.hpp>
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#include <boost/preprocessor/arithmetic/inc.hpp>
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#include <boost/preprocessor/selection/max.hpp>
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#include <boost/mpl/if.hpp>
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#include <boost/mpl/bool.hpp>
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#include <boost/utility/result_of.hpp>
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#include <boost/type_traits/remove_cv.hpp>
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#include <boost/proto/proto_fwd.hpp>
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#include <boost/proto/traits.hpp> // for child_c
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#include <boost/proto/detail/suffix.hpp> // must be last include
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namespace boost { namespace proto
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{
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namespace detail
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{
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template<typename T>
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yes_type check_is_expr_handled(T const &);
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no_type check_is_expr_handled(private_type_ const &);
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template<typename Context, long Arity>
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struct callable_context_wrapper;
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template<typename Expr, typename Context, long Arity = Expr::proto_arity_c>
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struct is_expr_handled;
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template<typename Expr, typename Context>
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struct is_expr_handled<Expr, Context, 0>
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{
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static callable_context_wrapper<Context, 1> &sctx_;
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static Expr &sexpr_;
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static typename Expr::proto_tag &stag_;
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BOOST_STATIC_CONSTANT(bool, value =
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(
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sizeof(yes_type) ==
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sizeof(
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detail::check_is_expr_handled(
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(sctx_(stag_, proto::value(sexpr_)), 0)
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)
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)));
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typedef mpl::bool_<value> type;
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};
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}
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namespace context
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{
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/// \brief A BinaryFunction that accepts a Proto expression and a
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/// callable context and calls the context with the expression tag
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/// and children as arguments, effectively fanning the expression
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/// out.
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///
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/// <tt>callable_eval\<\></tt> requires that \c Context is a
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/// PolymorphicFunctionObject that can be invoked with \c Expr's
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/// tag and children as expressions, as follows:
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///
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/// \code
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/// context(Expr::proto_tag(), child_c<0>(expr), child_c<1>(expr), ...)
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/// \endcode
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template<
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typename Expr
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, typename Context
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, long Arity BOOST_PROTO_WHEN_BUILDING_DOCS(= Expr::proto_arity_c)
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>
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struct callable_eval
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{};
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/// \brief A BinaryFunction that accepts a Proto expression and a
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/// callable context and calls the context with the expression tag
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/// and children as arguments, effectively fanning the expression
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/// out.
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///
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/// <tt>callable_eval\<\></tt> requires that \c Context is a
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/// PolymorphicFunctionObject that can be invoked with \c Expr's
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/// tag and children as expressions, as follows:
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///
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/// \code
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/// context(Expr::proto_tag(), value(expr))
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/// \endcode
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template<typename Expr, typename Context>
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struct callable_eval<Expr, Context, 0>
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{
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typedef typename proto::result_of::value<Expr const &>::type value_type;
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typedef
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typename boost::result_of<
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Context(typename Expr::proto_tag, value_type)
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>::type
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result_type;
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/// \param expr The current expression
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/// \param context The callable evaluation context
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/// \return <tt>context(Expr::proto_tag(), value(expr))</tt>
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result_type operator ()(Expr &expr, Context &context) const
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{
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return context(typename Expr::proto_tag(), proto::value(expr));
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}
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};
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/// \brief An evaluation context adaptor that makes authoring a
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/// context a simple matter of writing function overloads, rather
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/// then writing template specializations.
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///
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/// <tt>callable_context\<\></tt> is a base class that implements
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/// the context protocol by passing fanned-out expression nodes to
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/// the derived context, making it easy to customize the handling
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/// of expression types by writing function overloads. Only those
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/// expression types needing special handling require explicit
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/// handling. All others are dispatched to a user-specified
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/// default context, \c DefaultCtx.
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///
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/// <tt>callable_context\<\></tt> is defined simply as:
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///
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/// \code
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/// template<typename Context, typename DefaultCtx = default_context>
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/// struct callable_context
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/// {
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/// template<typename Expr, typename ThisContext = Context>
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/// struct eval
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/// : mpl::if_<
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/// is_expr_handled_<Expr, Context> // For exposition
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/// , callable_eval<Expr, ThisContext>
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/// , typename DefaultCtx::template eval<Expr, Context>
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/// >::type
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/// {};
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/// };
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/// \endcode
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///
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/// The Boolean metafunction <tt>is_expr_handled_\<\></tt> uses
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/// metaprogramming tricks to determine whether \c Context has
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/// an overloaded function call operator that accepts the
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/// fanned-out constituents of an expression of type \c Expr.
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/// If so, the handling of the expression is dispatched to
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/// <tt>callable_eval\<\></tt>. If not, it is dispatched to
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/// the user-specified \c DefaultCtx.
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///
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/// Below is an example of how to use <tt>callable_context\<\></tt>:
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///
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/// \code
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/// // An evaluation context that increments all
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/// // integer terminals in-place.
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/// struct increment_ints
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/// : callable_context<
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/// increment_ints const // derived context
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/// , null_context const // fall-back context
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/// >
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/// {
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/// typedef void result_type;
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///
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/// // Handle int terminals here:
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/// void operator()(proto::tag::terminal, int &i) const
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/// {
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/// ++i;
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/// }
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/// };
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/// \endcode
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///
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/// With \c increment_ints, we can do the following:
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///
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/// \code
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/// literal<int> i = 0, j = 10;
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/// proto::eval( i - j * 3.14, increment_ints() );
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///
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/// assert( i.get() == 1 && j.get() == 11 );
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/// \endcode
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template<
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typename Context
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, typename DefaultCtx BOOST_PROTO_WHEN_BUILDING_DOCS(= default_context)
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>
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struct callable_context
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{
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/// A BinaryFunction that accepts an \c Expr and a
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/// \c Context, and either fans out the expression and passes
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/// it to the context, or else hands off the expression to
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/// \c DefaultCtx.
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///
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/// If \c Context is a PolymorphicFunctionObject such that
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/// it can be invoked with the tag and children of \c Expr,
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/// as <tt>ctx(Expr::proto_tag(), child_c\<0\>(expr), child_c\<1\>(expr)...)</tt>,
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/// then <tt>eval\<Expr, ThisContext\></tt> inherits from
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/// <tt>callable_eval\<Expr, ThisContext\></tt>. Otherwise,
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/// <tt>eval\<Expr, ThisContext\></tt> inherits from
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/// <tt>DefaultCtx::eval\<Expr, Context\></tt>.
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template<typename Expr, typename ThisContext = Context>
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struct eval
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: mpl::if_<
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detail::is_expr_handled<Expr, Context>
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, callable_eval<Expr, ThisContext>
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, typename DefaultCtx::template eval<Expr, Context>
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>::type
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{};
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};
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}
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#define BOOST_PROTO_CHILD_N_TYPE(Z, N, Expr) \
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typedef typename proto::result_of::child_c<Expr const &, N>::type BOOST_PP_CAT(child, N); \
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/**/
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#define BOOST_PROTO_CHILD_N(Z, N, expr) \
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proto::child_c<N>(expr) \
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/**/
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#define BOOST_PP_ITERATION_PARAMS_1 \
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(3, (1, BOOST_PROTO_MAX_ARITY, <boost/proto/context/callable.hpp>)) \
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/**/
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#include BOOST_PP_ITERATE()
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#undef BOOST_PROTO_CHILD_N_TYPE
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#undef BOOST_PROTO_CHILD_N
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}}
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#endif
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#else
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#define N BOOST_PP_ITERATION()
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namespace detail
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{
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template<typename Context>
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struct callable_context_wrapper<Context, N>
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: remove_cv<Context>::type
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{
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callable_context_wrapper();
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typedef
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private_type_ const &fun_type(
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BOOST_PP_ENUM_PARAMS(
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BOOST_PP_INC(N)
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, detail::dont_care BOOST_PP_INTERCEPT
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)
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);
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operator fun_type *() const;
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};
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template<typename Expr, typename Context>
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struct is_expr_handled<Expr, Context, N>
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{
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static callable_context_wrapper<Context, N> &sctx_;
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static Expr &sexpr_;
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static typename Expr::proto_tag &stag_;
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BOOST_STATIC_CONSTANT(bool, value =
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(
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sizeof(yes_type) ==
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sizeof(
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detail::check_is_expr_handled(
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(sctx_(
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stag_
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BOOST_PP_ENUM_TRAILING(N, BOOST_PROTO_CHILD_N, sexpr_)
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), 0)
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)
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)));
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typedef mpl::bool_<value> type;
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};
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}
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namespace context
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{
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/// \brief A BinaryFunction that accepts a Proto expression and a
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/// callable context and calls the context with the expression tag
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/// and children as arguments, effectively fanning the expression
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/// out.
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///
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/// <tt>callable_eval\<\></tt> requires that \c Context is a
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/// PolymorphicFunctionObject that can be invoked with \c Expr's
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/// tag and children as expressions, as follows:
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///
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/// \code
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/// context(Expr::proto_tag(), child_c\<0\>(expr), child_c\<1\>(expr), ...)
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/// \endcode
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template<typename Expr, typename Context>
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struct callable_eval<Expr, Context, N>
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{
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BOOST_PP_REPEAT(N, BOOST_PROTO_CHILD_N_TYPE, Expr)
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typedef
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typename boost::result_of<
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Context(
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typename Expr::proto_tag
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BOOST_PP_ENUM_TRAILING_PARAMS(N, child)
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)
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>::type
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result_type;
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/// \param expr The current expression
|
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/// \param context The callable evaluation context
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/// \return <tt>context(Expr::proto_tag(), child_c\<0\>(expr), child_c\<1\>(expr), ...)</tt>
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result_type operator ()(Expr &expr, Context &context) const
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{
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return context(
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typename Expr::proto_tag()
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BOOST_PP_ENUM_TRAILING(N, BOOST_PROTO_CHILD_N, expr)
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);
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}
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};
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}
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#undef N
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#endif
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434
libraries/include/boost/proto/context/default.hpp
Normal file
434
libraries/include/boost/proto/context/default.hpp
Normal file
@@ -0,0 +1,434 @@
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#ifndef BOOST_PP_IS_ITERATING
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///////////////////////////////////////////////////////////////////////////////
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/// \file default.hpp
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/// Definintion of default_context, a default evaluation context for
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/// proto::eval() that uses Boost.Typeof to deduce return types
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/// of the built-in operators.
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//
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// Copyright 2008 Eric Niebler. Distributed under the Boost
|
||||
// Software License, Version 1.0. (See accompanying file
|
||||
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
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#ifndef BOOST_PROTO_CONTEXT_DEFAULT_HPP_EAN_01_08_2007
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#define BOOST_PROTO_CONTEXT_DEFAULT_HPP_EAN_01_08_2007
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#include <boost/proto/detail/prefix.hpp> // must be first include
|
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#include <boost/config.hpp>
|
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#include <boost/preprocessor/iteration/iterate.hpp>
|
||||
#include <boost/preprocessor/repetition/enum_shifted.hpp>
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#include <boost/utility/result_of.hpp>
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#include <boost/type_traits/is_const.hpp>
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#include <boost/type_traits/is_function.hpp>
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#include <boost/type_traits/remove_reference.hpp>
|
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#include <boost/type_traits/is_member_pointer.hpp>
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#include <boost/type_traits/is_member_object_pointer.hpp>
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#include <boost/type_traits/is_member_function_pointer.hpp>
|
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#include <boost/proto/proto_fwd.hpp>
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#include <boost/proto/tags.hpp>
|
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#include <boost/proto/eval.hpp>
|
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#include <boost/proto/traits.hpp> // for proto::child_c()
|
||||
#include <boost/proto/detail/decltype.hpp>
|
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#include <boost/proto/detail/suffix.hpp> // must be last include
|
||||
|
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namespace boost { namespace proto
|
||||
{
|
||||
/// INTERNAL ONLY
|
||||
///
|
||||
#define UNREF(x) typename boost::remove_reference<x>::type
|
||||
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namespace context
|
||||
{
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||||
template<
|
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typename Expr
|
||||
, typename Context
|
||||
, typename Tag BOOST_PROTO_WHEN_BUILDING_DOCS(= typename Expr::proto_tag)
|
||||
, long Arity BOOST_PROTO_WHEN_BUILDING_DOCS(= Expr::proto_arity_c)
|
||||
>
|
||||
struct default_eval
|
||||
{};
|
||||
|
||||
/// INTERNAL ONLY
|
||||
///
|
||||
#define BOOST_PROTO_UNARY_OP_RESULT(OP, TAG, MAKE) \
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||||
template<typename Expr, typename Context> \
|
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struct default_eval<Expr, Context, TAG, 1> \
|
||||
{ \
|
||||
private: \
|
||||
typedef typename proto::result_of::child_c<Expr, 0>::type e0; \
|
||||
typedef typename proto::result_of::eval<UNREF(e0), Context>::type r0; \
|
||||
public: \
|
||||
BOOST_PROTO_DECLTYPE_(OP proto::detail::MAKE<r0>(), result_type) \
|
||||
result_type operator ()(Expr &expr, Context &ctx) const \
|
||||
{ \
|
||||
return OP proto::eval(proto::child_c<0>(expr), ctx); \
|
||||
} \
|
||||
}; \
|
||||
/**/
|
||||
|
||||
/// INTERNAL ONLY
|
||||
///
|
||||
#define BOOST_PROTO_BINARY_OP_RESULT(OP, TAG, LMAKE, RMAKE) \
|
||||
template<typename Expr, typename Context> \
|
||||
struct default_eval<Expr, Context, TAG, 2> \
|
||||
{ \
|
||||
private: \
|
||||
typedef typename proto::result_of::child_c<Expr, 0>::type e0; \
|
||||
typedef typename proto::result_of::child_c<Expr, 1>::type e1; \
|
||||
typedef typename proto::result_of::eval<UNREF(e0), Context>::type r0; \
|
||||
typedef typename proto::result_of::eval<UNREF(e1), Context>::type r1; \
|
||||
public: \
|
||||
BOOST_PROTO_DECLTYPE_( \
|
||||
proto::detail::LMAKE<r0>() OP proto::detail::RMAKE<r1>() \
|
||||
, result_type \
|
||||
) \
|
||||
result_type operator ()(Expr &expr, Context &ctx) const \
|
||||
{ \
|
||||
return proto::eval( \
|
||||
proto::child_c<0>(expr), ctx) OP proto::eval(proto::child_c<1>(expr) \
|
||||
, ctx \
|
||||
); \
|
||||
} \
|
||||
}; \
|
||||
/**/
|
||||
|
||||
BOOST_PROTO_UNARY_OP_RESULT(+, proto::tag::unary_plus, make)
|
||||
BOOST_PROTO_UNARY_OP_RESULT(-, proto::tag::negate, make)
|
||||
BOOST_PROTO_UNARY_OP_RESULT(*, proto::tag::dereference, make)
|
||||
BOOST_PROTO_UNARY_OP_RESULT(~, proto::tag::complement, make)
|
||||
BOOST_PROTO_UNARY_OP_RESULT(&, proto::tag::address_of, make)
|
||||
BOOST_PROTO_UNARY_OP_RESULT(!, proto::tag::logical_not, make)
|
||||
BOOST_PROTO_UNARY_OP_RESULT(++, proto::tag::pre_inc, make_mutable)
|
||||
BOOST_PROTO_UNARY_OP_RESULT(--, proto::tag::pre_dec, make_mutable)
|
||||
|
||||
BOOST_PROTO_BINARY_OP_RESULT(<<, proto::tag::shift_left, make_mutable, make)
|
||||
BOOST_PROTO_BINARY_OP_RESULT(>>, proto::tag::shift_right, make_mutable, make)
|
||||
BOOST_PROTO_BINARY_OP_RESULT(*, proto::tag::multiplies, make, make)
|
||||
BOOST_PROTO_BINARY_OP_RESULT(/, proto::tag::divides, make, make)
|
||||
BOOST_PROTO_BINARY_OP_RESULT(%, proto::tag::modulus, make, make)
|
||||
BOOST_PROTO_BINARY_OP_RESULT(+, proto::tag::plus, make, make)
|
||||
BOOST_PROTO_BINARY_OP_RESULT(-, proto::tag::minus, make, make)
|
||||
BOOST_PROTO_BINARY_OP_RESULT(<, proto::tag::less, make, make)
|
||||
BOOST_PROTO_BINARY_OP_RESULT(>, proto::tag::greater, make, make)
|
||||
BOOST_PROTO_BINARY_OP_RESULT(<=, proto::tag::less_equal, make, make)
|
||||
BOOST_PROTO_BINARY_OP_RESULT(>=, proto::tag::greater_equal, make, make)
|
||||
BOOST_PROTO_BINARY_OP_RESULT(==, proto::tag::equal_to, make, make)
|
||||
BOOST_PROTO_BINARY_OP_RESULT(!=, proto::tag::not_equal_to, make, make)
|
||||
BOOST_PROTO_BINARY_OP_RESULT(||, proto::tag::logical_or, make, make)
|
||||
BOOST_PROTO_BINARY_OP_RESULT(&&, proto::tag::logical_and, make, make)
|
||||
BOOST_PROTO_BINARY_OP_RESULT(&, proto::tag::bitwise_and, make, make)
|
||||
BOOST_PROTO_BINARY_OP_RESULT(|, proto::tag::bitwise_or, make, make)
|
||||
BOOST_PROTO_BINARY_OP_RESULT(^, proto::tag::bitwise_xor, make, make)
|
||||
|
||||
BOOST_PROTO_BINARY_OP_RESULT(=, proto::tag::assign, make_mutable, make)
|
||||
BOOST_PROTO_BINARY_OP_RESULT(<<=, proto::tag::shift_left_assign, make_mutable, make)
|
||||
BOOST_PROTO_BINARY_OP_RESULT(>>=, proto::tag::shift_right_assign, make_mutable, make)
|
||||
BOOST_PROTO_BINARY_OP_RESULT(*=, proto::tag::multiplies_assign, make_mutable, make)
|
||||
BOOST_PROTO_BINARY_OP_RESULT(/=, proto::tag::divides_assign, make_mutable, make)
|
||||
BOOST_PROTO_BINARY_OP_RESULT(%=, proto::tag::modulus_assign, make_mutable, make)
|
||||
BOOST_PROTO_BINARY_OP_RESULT(+=, proto::tag::plus_assign, make_mutable, make)
|
||||
BOOST_PROTO_BINARY_OP_RESULT(-=, proto::tag::minus_assign, make_mutable, make)
|
||||
BOOST_PROTO_BINARY_OP_RESULT(&=, proto::tag::bitwise_and_assign, make_mutable, make)
|
||||
BOOST_PROTO_BINARY_OP_RESULT(|=, proto::tag::bitwise_or_assign, make_mutable, make)
|
||||
BOOST_PROTO_BINARY_OP_RESULT(^=, proto::tag::bitwise_xor_assign, make_mutable, make)
|
||||
|
||||
#undef BOOST_PROTO_UNARY_OP_RESULT
|
||||
#undef BOOST_PROTO_BINARY_OP_RESULT
|
||||
|
||||
/// INTERNAL ONLY
|
||||
template<typename Expr, typename Context>
|
||||
struct is_member_function_eval
|
||||
{
|
||||
typedef typename proto::result_of::child_c<Expr, 1>::type e1;
|
||||
typedef typename proto::result_of::eval<UNREF(e1), Context>::type r1;
|
||||
typedef typename remove_const<typename remove_reference<r1>::type>::type uncvref_r1;
|
||||
typedef typename is_member_function_pointer<uncvref_r1>::type type;
|
||||
BOOST_STATIC_CONSTANT(bool, value = type::value);
|
||||
};
|
||||
|
||||
/// INTERNAL ONLY
|
||||
template<typename Expr, typename Context, bool IsMemFunCall>
|
||||
struct memfun_eval
|
||||
{
|
||||
private:
|
||||
typedef typename result_of::child_c<Expr, 0>::type e0;
|
||||
typedef typename result_of::child_c<Expr, 1>::type e1;
|
||||
typedef typename proto::result_of::eval<UNREF(e0), Context>::type r0;
|
||||
typedef typename proto::result_of::eval<UNREF(e1), Context>::type r1;
|
||||
public:
|
||||
typedef typename detail::mem_ptr_fun<r0, r1>::result_type result_type;
|
||||
result_type operator ()(Expr &expr, Context &ctx) const
|
||||
{
|
||||
return detail::mem_ptr_fun<r0, r1>()(
|
||||
proto::eval(proto::child_c<0>(expr), ctx)
|
||||
, proto::eval(proto::child_c<1>(expr), ctx)
|
||||
);
|
||||
}
|
||||
};
|
||||
|
||||
/// INTERNAL ONLY
|
||||
template<typename Expr, typename Context>
|
||||
struct memfun_eval<Expr, Context, true>
|
||||
{
|
||||
private:
|
||||
typedef typename result_of::child_c<Expr, 0>::type e0;
|
||||
typedef typename result_of::child_c<Expr, 1>::type e1;
|
||||
typedef typename proto::result_of::eval<UNREF(e0), Context>::type r0;
|
||||
typedef typename proto::result_of::eval<UNREF(e1), Context>::type r1;
|
||||
public:
|
||||
typedef detail::memfun<r0, r1> result_type;
|
||||
result_type const operator ()(Expr &expr, Context &ctx) const
|
||||
{
|
||||
return detail::memfun<r0, r1>(
|
||||
proto::eval(proto::child_c<0>(expr), ctx)
|
||||
, proto::eval(proto::child_c<1>(expr), ctx)
|
||||
);
|
||||
}
|
||||
};
|
||||
|
||||
template<typename Expr, typename Context>
|
||||
struct default_eval<Expr, Context, tag::mem_ptr, 2>
|
||||
: memfun_eval<Expr, Context, is_member_function_eval<Expr, Context>::value>
|
||||
{};
|
||||
|
||||
template<typename Expr, typename Context, typename Tag>
|
||||
struct default_eval<Expr, Context, Tag, 0>
|
||||
{
|
||||
typedef
|
||||
typename proto::result_of::value<Expr &>::type
|
||||
result_type;
|
||||
|
||||
result_type operator ()(Expr &expr, Context &) const
|
||||
{
|
||||
return proto::value(expr);
|
||||
}
|
||||
};
|
||||
|
||||
// Handle post-increment specially.
|
||||
template<typename Expr, typename Context>
|
||||
struct default_eval<Expr, Context, proto::tag::post_inc, 1>
|
||||
{
|
||||
private:
|
||||
typedef typename proto::result_of::child_c<Expr, 0>::type e0;
|
||||
typedef typename proto::result_of::eval<UNREF(e0), Context>::type r0;
|
||||
public:
|
||||
BOOST_PROTO_DECLTYPE_(proto::detail::make_mutable<r0>() ++, result_type)
|
||||
result_type operator ()(Expr &expr, Context &ctx) const
|
||||
{
|
||||
return proto::eval(proto::child_c<0>(expr), ctx) ++;
|
||||
}
|
||||
};
|
||||
|
||||
// Handle post-decrement specially.
|
||||
template<typename Expr, typename Context>
|
||||
struct default_eval<Expr, Context, proto::tag::post_dec, 1>
|
||||
{
|
||||
private:
|
||||
typedef typename proto::result_of::child_c<Expr, 0>::type e0;
|
||||
typedef typename proto::result_of::eval<UNREF(e0), Context>::type r0;
|
||||
public:
|
||||
BOOST_PROTO_DECLTYPE_(proto::detail::make_mutable<r0>() --, result_type)
|
||||
result_type operator ()(Expr &expr, Context &ctx) const
|
||||
{
|
||||
return proto::eval(proto::child_c<0>(expr), ctx) --;
|
||||
}
|
||||
};
|
||||
|
||||
// Handle subscript specially.
|
||||
template<typename Expr, typename Context>
|
||||
struct default_eval<Expr, Context, proto::tag::subscript, 2>
|
||||
{
|
||||
private:
|
||||
typedef typename proto::result_of::child_c<Expr, 0>::type e0;
|
||||
typedef typename proto::result_of::child_c<Expr, 1>::type e1;
|
||||
typedef typename proto::result_of::eval<UNREF(e0), Context>::type r0;
|
||||
typedef typename proto::result_of::eval<UNREF(e1), Context>::type r1;
|
||||
public:
|
||||
BOOST_PROTO_DECLTYPE_(proto::detail::make_subscriptable<r0>()[proto::detail::make<r1>()], result_type)
|
||||
result_type operator ()(Expr &expr, Context &ctx) const
|
||||
{
|
||||
return proto::eval(proto::child_c<0>(expr), ctx)[proto::eval(proto::child_c<1>(expr), ctx)];
|
||||
}
|
||||
};
|
||||
|
||||
// Handle if_else_ specially.
|
||||
template<typename Expr, typename Context>
|
||||
struct default_eval<Expr, Context, proto::tag::if_else_, 3>
|
||||
{
|
||||
private:
|
||||
typedef typename proto::result_of::child_c<Expr, 0>::type e0;
|
||||
typedef typename proto::result_of::child_c<Expr, 1>::type e1;
|
||||
typedef typename proto::result_of::child_c<Expr, 2>::type e2;
|
||||
typedef typename proto::result_of::eval<UNREF(e0), Context>::type r0;
|
||||
typedef typename proto::result_of::eval<UNREF(e1), Context>::type r1;
|
||||
typedef typename proto::result_of::eval<UNREF(e2), Context>::type r2;
|
||||
public:
|
||||
BOOST_PROTO_DECLTYPE_(
|
||||
proto::detail::make<r0>()
|
||||
? proto::detail::make<r1>()
|
||||
: proto::detail::make<r2>()
|
||||
, result_type
|
||||
)
|
||||
result_type operator ()(Expr &expr, Context &ctx) const
|
||||
{
|
||||
return proto::eval(proto::child_c<0>(expr), ctx)
|
||||
? proto::eval(proto::child_c<1>(expr), ctx)
|
||||
: proto::eval(proto::child_c<2>(expr), ctx);
|
||||
}
|
||||
};
|
||||
|
||||
// Handle comma specially.
|
||||
template<typename Expr, typename Context>
|
||||
struct default_eval<Expr, Context, proto::tag::comma, 2>
|
||||
{
|
||||
private:
|
||||
typedef typename proto::result_of::child_c<Expr, 0>::type e0;
|
||||
typedef typename proto::result_of::child_c<Expr, 1>::type e1;
|
||||
typedef typename proto::result_of::eval<UNREF(e0), Context>::type r0;
|
||||
typedef typename proto::result_of::eval<UNREF(e1), Context>::type r1;
|
||||
public:
|
||||
typedef typename proto::detail::comma_result<r0, r1>::type result_type;
|
||||
result_type operator ()(Expr &expr, Context &ctx) const
|
||||
{
|
||||
return proto::eval(proto::child_c<0>(expr), ctx), proto::eval(proto::child_c<1>(expr), ctx);
|
||||
}
|
||||
};
|
||||
|
||||
// Handle function specially
|
||||
#define EVAL_TYPE(Z, N, DATA) \
|
||||
typename proto::result_of::eval< \
|
||||
typename remove_reference< \
|
||||
typename proto::result_of::child_c<DATA, N>::type \
|
||||
>::type \
|
||||
, Context \
|
||||
>::type \
|
||||
/**/
|
||||
|
||||
#define EVAL(Z, N, DATA) \
|
||||
proto::eval(proto::child_c<N>(DATA), context) \
|
||||
/**/
|
||||
|
||||
template<typename Expr, typename Context>
|
||||
struct default_eval<Expr, Context, proto::tag::function, 1>
|
||||
{
|
||||
typedef
|
||||
typename proto::detail::result_of_fixup<EVAL_TYPE(~, 0, Expr)>::type
|
||||
function_type;
|
||||
|
||||
typedef
|
||||
typename boost::result_of<function_type()>::type
|
||||
result_type;
|
||||
|
||||
result_type operator ()(Expr &expr, Context &context) const
|
||||
{
|
||||
return EVAL(~, 0, expr)();
|
||||
}
|
||||
};
|
||||
|
||||
template<typename Expr, typename Context>
|
||||
struct default_eval<Expr, Context, proto::tag::function, 2>
|
||||
{
|
||||
typedef
|
||||
typename proto::detail::result_of_fixup<EVAL_TYPE(~, 0, Expr)>::type
|
||||
function_type;
|
||||
|
||||
typedef
|
||||
typename detail::result_of_<function_type(EVAL_TYPE(~, 1, Expr))>::type
|
||||
result_type;
|
||||
|
||||
result_type operator ()(Expr &expr, Context &context) const
|
||||
{
|
||||
return this->invoke(
|
||||
expr
|
||||
, context
|
||||
, is_member_function_pointer<function_type>()
|
||||
, is_member_object_pointer<function_type>()
|
||||
);
|
||||
}
|
||||
|
||||
private:
|
||||
result_type invoke(Expr &expr, Context &context, mpl::false_, mpl::false_) const
|
||||
{
|
||||
return EVAL(~, 0, expr)(EVAL(~, 1, expr));
|
||||
}
|
||||
|
||||
result_type invoke(Expr &expr, Context &context, mpl::true_, mpl::false_) const
|
||||
{
|
||||
using namespace detail::get_pointer_;
|
||||
return (get_pointer(EVAL(~, 1, expr)) ->* EVAL(~, 0, expr))();
|
||||
}
|
||||
|
||||
result_type invoke(Expr &expr, Context &context, mpl::false_, mpl::true_) const
|
||||
{
|
||||
using namespace detail::get_pointer_;
|
||||
return (get_pointer(EVAL(~, 1, expr)) ->* EVAL(~, 0, expr));
|
||||
}
|
||||
};
|
||||
|
||||
#define BOOST_PP_ITERATION_PARAMS_1 (3, (3, BOOST_PROTO_MAX_ARITY, <boost/proto/context/default.hpp>))
|
||||
#include BOOST_PP_ITERATE()
|
||||
|
||||
#undef EVAL_TYPE
|
||||
#undef EVAL
|
||||
|
||||
/// default_context
|
||||
///
|
||||
struct default_context
|
||||
{
|
||||
/// default_context::eval
|
||||
///
|
||||
template<typename Expr, typename ThisContext = default_context const>
|
||||
struct eval
|
||||
: default_eval<Expr, ThisContext>
|
||||
{};
|
||||
};
|
||||
|
||||
} // namespace context
|
||||
|
||||
}} // namespace boost::proto
|
||||
|
||||
#undef UNREF
|
||||
|
||||
#endif
|
||||
|
||||
#else
|
||||
|
||||
#define N BOOST_PP_ITERATION()
|
||||
|
||||
template<typename Expr, typename Context>
|
||||
struct default_eval<Expr, Context, proto::tag::function, N>
|
||||
{
|
||||
typedef
|
||||
typename proto::detail::result_of_fixup<EVAL_TYPE(~, 0, Expr)>::type
|
||||
function_type;
|
||||
|
||||
typedef
|
||||
typename boost::result_of<
|
||||
function_type(BOOST_PP_ENUM_SHIFTED(N, EVAL_TYPE, Expr))
|
||||
>::type
|
||||
result_type;
|
||||
|
||||
result_type operator ()(Expr &expr, Context &context) const
|
||||
{
|
||||
return this->invoke(expr, context, is_member_function_pointer<function_type>());
|
||||
}
|
||||
|
||||
private:
|
||||
result_type invoke(Expr &expr, Context &context, mpl::false_) const
|
||||
{
|
||||
return EVAL(~, 0, expr)(BOOST_PP_ENUM_SHIFTED(N, EVAL, expr));
|
||||
}
|
||||
|
||||
result_type invoke(Expr &expr, Context &context, mpl::true_) const
|
||||
{
|
||||
#define M0(Z, M, expr) BOOST_PP_COMMA_IF(BOOST_PP_SUB(M, 2)) EVAL(Z, M, expr)
|
||||
using namespace detail::get_pointer_;
|
||||
return (get_pointer(EVAL(~, 1, expr)) ->* EVAL(~, 0, expr))(
|
||||
BOOST_PP_REPEAT_FROM_TO(2, N, M0, expr)
|
||||
);
|
||||
#undef M0
|
||||
}
|
||||
};
|
||||
|
||||
#undef N
|
||||
|
||||
#endif
|
||||
87
libraries/include/boost/proto/context/null.hpp
Normal file
87
libraries/include/boost/proto/context/null.hpp
Normal file
@@ -0,0 +1,87 @@
|
||||
#ifndef BOOST_PP_IS_ITERATING
|
||||
///////////////////////////////////////////////////////////////////////////////
|
||||
/// \file null.hpp
|
||||
/// Definintion of null_context\<\>, an evaluation context for
|
||||
/// proto::eval() that simply evaluates each child expression, doesn't
|
||||
/// combine the results at all, and returns void.
|
||||
//
|
||||
// Copyright 2008 Eric Niebler. Distributed under the Boost
|
||||
// Software License, Version 1.0. (See accompanying file
|
||||
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
||||
|
||||
#ifndef BOOST_PROTO_CONTEXT_NULL_HPP_EAN_06_24_2007
|
||||
#define BOOST_PROTO_CONTEXT_NULL_HPP_EAN_06_24_2007
|
||||
|
||||
#include <boost/proto/detail/prefix.hpp> // must be first include
|
||||
#include <boost/preprocessor/iteration/iterate.hpp>
|
||||
#include <boost/preprocessor/repetition/repeat.hpp>
|
||||
#include <boost/proto/proto_fwd.hpp>
|
||||
#include <boost/proto/eval.hpp>
|
||||
#include <boost/proto/traits.hpp>
|
||||
#include <boost/proto/detail/suffix.hpp> // must be last include
|
||||
|
||||
namespace boost { namespace proto { namespace context
|
||||
{
|
||||
|
||||
template<
|
||||
typename Expr
|
||||
, typename Context
|
||||
, long Arity BOOST_PROTO_WHEN_BUILDING_DOCS(= Expr::proto_arity_c)
|
||||
>
|
||||
struct null_eval
|
||||
{};
|
||||
|
||||
template<typename Expr, typename Context>
|
||||
struct null_eval<Expr, Context, 0>
|
||||
{
|
||||
typedef void result_type;
|
||||
void operator()(Expr &, Context &) const
|
||||
{}
|
||||
};
|
||||
|
||||
#define BOOST_PROTO_EVAL_N(Z, N, DATA) \
|
||||
proto::eval(proto::child_c<N>(expr), ctx); \
|
||||
/**/
|
||||
|
||||
#define BOOST_PP_ITERATION_PARAMS_1 \
|
||||
(3, (1, BOOST_PROTO_MAX_ARITY, <boost/proto/context/null.hpp>)) \
|
||||
/**/
|
||||
|
||||
#include BOOST_PP_ITERATE()
|
||||
|
||||
#undef BOOST_PROTO_EVAL_N
|
||||
|
||||
/// null_context
|
||||
///
|
||||
struct null_context
|
||||
{
|
||||
/// null_context::eval
|
||||
///
|
||||
template<typename Expr, typename ThisContext = null_context const>
|
||||
struct eval
|
||||
: null_eval<Expr, ThisContext>
|
||||
{};
|
||||
};
|
||||
|
||||
}}}
|
||||
|
||||
#endif
|
||||
|
||||
#else
|
||||
|
||||
#define N BOOST_PP_ITERATION()
|
||||
|
||||
template<typename Expr, typename Context>
|
||||
struct null_eval<Expr, Context, N>
|
||||
{
|
||||
typedef void result_type;
|
||||
|
||||
void operator ()(Expr &expr, Context &ctx) const
|
||||
{
|
||||
BOOST_PP_REPEAT(N, BOOST_PROTO_EVAL_N, ~)
|
||||
}
|
||||
};
|
||||
|
||||
#undef N
|
||||
|
||||
#endif
|
||||
Reference in New Issue
Block a user