Drake's trivially copyable optimop

indra/llmath/m4math.h

@@ -117,7 +117,7 @@ public:
 			  const LLVector4 &pos);						// Initializes Matrix with Euler angles
 	LLMatrix4(const F32 roll, const F32 pitch, const F32 yaw);				// Initializes Matrix with Euler angles
 
-	~LLMatrix4(void);										// Destructor
+	~LLMatrix4() = default;									// Destructor
 
 	LLSD getValue() const;
 	void setValue(const LLSD&);
@@ -246,6 +246,8 @@ public:
 	friend std::ostream&	 operator<<(std::ostream& s, const LLMatrix4 &a);	// Stream a
 };
 
+static_assert(std::is_trivially_copyable<LLMatrix4>{}, "LLMatrix4 must be a trivially copyable type");
+
 inline const LLMatrix4&	LLMatrix4::setIdentity()
 {
 	mMatrix[0][0] = 1.f;