Imported existing code
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Hazim Gazov
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libraries/include/boost/static_warning.hpp
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libraries/include/boost/static_warning.hpp
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#ifndef BOOST_STATIC_WARNING_HPP
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#define BOOST_STATIC_WARNING_HPP
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// (C) Copyright Robert Ramey 2003. Jonathan Turkanis 2004.
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// Use, modification and distribution is subject to the Boost Software
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// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// MS compatible compilers support #pragma once
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#if defined(_MSC_VER) && (_MSC_VER >= 1020)
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# pragma once
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#endif
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// http://www.boost.org/LICENSE_1_0.txt)
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// See http://www.boost.org/libs/static_assert for documentation.
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/*
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Revision history:
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15 June 2003 - Initial version.
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31 March 2004 - improved diagnostic messages and portability
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(Jonathan Turkanis)
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03 April 2004 - works on VC6 at class and namespace scope
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- ported to DigitalMars
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- static warnings disabled by default; when enabled,
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uses pragmas to enable required compiler warnings
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on MSVC, Intel, Metrowerks and Borland 5.x.
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(Jonathan Turkanis)
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30 May 2004 - tweaked for msvc 7.1 and gcc 3.3
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- static warnings ENabled by default; when enabled,
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(Robert Ramey)
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*/
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#include <boost/config.hpp>
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//
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// Implementation
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// Makes use of the following warnings:
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// 1. GCC prior to 3.3: division by zero.
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// 2. BCC 6.0 preview: unreferenced local variable.
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// 3. DigitalMars: returning address of local automatic variable.
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// 4. VC6: class previously seen as struct (as in 'boost/mpl/print.hpp')
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// 5. All others: deletion of pointer to incomplete type.
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//
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// The trick is to find code which produces warnings containing the name of
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// a structure or variable. Details, with same numbering as above:
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// 1. static_warning_impl<B>::value is zero iff B is false, so diving an int
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// by this value generates a warning iff B is false.
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// 2. static_warning_impl<B>::type has a constructor iff B is true, so an
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// unreferenced variable of this type generates a warning iff B is false.
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// 3. static_warning_impl<B>::type overloads operator& to return a dynamically
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// allocated int pointer only is B is true, so returning the address of an
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// automatic variable of this type generates a warning iff B is fasle.
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// 4. static_warning_impl<B>::STATIC_WARNING is decalred as a struct iff B is
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// false.
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// 5. static_warning_impl<B>::type is incomplete iff B is false, so deleting a
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// pointer to this type generates a warning iff B is false.
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//
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//------------------Enable selected warnings----------------------------------//
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// Enable the warnings relied on by BOOST_STATIC_WARNING, where possible. The
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// only pragma which is absolutely necessary here is for Borland 5.x, since
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// W8073 is disabled by default. If enabling selected warnings is considered
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// unacceptable, this section can be replaced with:
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// #if defined(__BORLANDC__) && (__BORLANDC__ <= 0x600)
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// pragma warn +stu
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// #endif
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# if defined(BOOST_MSVC)
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# pragma warning(2:4150) // C4150: deletion of pointer to incomplete type 'type'.
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# elif defined(BOOST_INTEL) && (defined(__WIN32__) || defined(WIN32))
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# pragma warning(2:457) // #457: delete of pointer to incomplete class.
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# elif defined(__BORLANDC__) && (__BORLANDC__ <= 0x600)
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# pragma warn +stu // W8073: Undefined structure 'structure'.
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# elif defined(__MWERKS__)
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# pragma extended_errorcheck on // Enable 'extended error checking'.
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# endif
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//------------------Configure-------------------------------------------------//
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# if defined(__BORLANDC__) && (__BORLANDC__ >= 0x600)
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# define BOOST_HAS_DESCRIPTIVE_UNREFERENCED_VARIABLE_WARNING
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# elif defined(__GNUC__) && !defined(BOOST_INTEL) // && (__GNUC__ * 100 + __GNUC_MINOR__ <= 302)
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# define BOOST_HAS_DESCRIPTIVE_DIVIDE_BY_ZERO_WARNING
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# elif defined(__DMC__)
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# define BOOST_HAS_DESCRIPTIVE_RETURNING_ADDRESS_OF_TEMPORARY_WARNING
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# elif defined(BOOST_MSVC) // && (BOOST_MSVC < 1300)
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# define BOOST_NO_PREDEFINED_LINE_MACRO
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# pragma warning(disable:4094) // C4094: untagged 'stuct' declared no symbols
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#endif
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//------------------Helper templates------------------------------------------//
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namespace boost {
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struct STATIC_WARNING;
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template<bool>
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struct static_warning_impl;
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template<>
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struct static_warning_impl<false> {
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enum { value = 0 };
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#if !defined(BOOST_HAS_DESCRIPTIVE_UNREFERENCED_VARIABLE_WARNING) && \
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!defined(BOOST_HAS_DESCRIPTIVE_RETURNING_ADDRESS_OF_TEMPORARY_WARNING)
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typedef boost::STATIC_WARNING type;
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#else
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typedef int type;
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#endif
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#if defined(BOOST_NO_PREDEFINED_LINE_MACRO)
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struct STATIC_WARNING { };
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#endif
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};
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template<>
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struct static_warning_impl<true> {
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enum { value = 1 };
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struct type { type() { } int* operator&() { return new int; } };
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#if defined(BOOST_NO_PREDEFINED_LINE_MACRO)
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class STATIC_WARNING { };
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#endif
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};
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} // namespace boost
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//------------------Definition of BOOST_STATIC_WARNING------------------------//
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#if defined(BOOST_HAS_DESCRIPTIVE_UNREFERENCED_VARIABLE_WARNING)
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# define BOOST_STATIC_WARNING_IMPL(B) \
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struct BOOST_JOIN(STATIC_WARNING, __LINE__) { \
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void f() { \
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::boost::static_warning_impl<(bool)( B )>::type \
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STATIC_WARNING; \
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} \
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} \
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/**/
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#elif defined(BOOST_HAS_DESCRIPTIVE_RETURNING_ADDRESS_OF_TEMPORARY_WARNING)
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# define BOOST_STATIC_WARNING_IMPL(B) \
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struct BOOST_JOIN(STATIC_WARNING, __LINE__) { \
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int* f() { \
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::boost::static_warning_impl<(bool)( B )>::type \
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STATIC_WARNING; \
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return &STATIC_WARNING; \
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} \
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} \
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/**/
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#elif defined(BOOST_HAS_DESCRIPTIVE_DIVIDE_BY_ZERO_WARNING)
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# define BOOST_STATIC_WARNING_IMPL(B) \
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struct BOOST_JOIN(STATIC_WARNING, __LINE__) { \
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int f() { int STATIC_WARNING = 1; \
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return STATIC_WARNING / \
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boost::static_warning_impl<(bool)( B )>::value; } \
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} \
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/**/
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#elif defined(BOOST_NO_PREDEFINED_LINE_MACRO)
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// VC6; __LINE__ macro broken when -ZI is used see Q199057, so
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// non-conforming workaround is used.
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# define BOOST_STATIC_WARNING_IMPL(B) \
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struct { \
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struct S { \
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typedef boost::static_warning_impl<(bool)( B )> f; \
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friend class f::STATIC_WARNING; \
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}; \
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} \
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/**/
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#else // Deletion of pointer to incomplete type.
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# define BOOST_STATIC_WARNING_IMPL(B) \
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struct BOOST_JOIN(STATIC_WARNING, __LINE__) { \
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::boost::static_warning_impl<(bool)( B )>::type* p; \
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void f() { delete p; } \
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} \
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/**/
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#endif
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#ifndef BOOST_DISABLE_STATIC_WARNINGS
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# define BOOST_STATIC_WARNING(B) BOOST_STATIC_WARNING_IMPL(B)
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#else // #ifdef BOOST_ENABLE_STATIC_WARNINGS //-------------------------------//
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# define BOOST_STATIC_WARNING(B) BOOST_STATIC_WARNING_IMPL(true)
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#endif
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#endif // BOOST_STATIC_WARNING_HPP
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