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static_assert.hpp
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static_assert.hpp
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// (C) Copyright John Maddock 2000.
// Use, modification and distribution are subject to 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)
// See http://www.boost.org/libs/static_assert for documentation.
/*
Revision history:
02 August 2000
Initial version.
*/
#ifndef BOOST_STATIC_ASSERT_HPP
#define BOOST_STATIC_ASSERT_HPP
#include <boost/config.hpp>
#include <boost/detail/workaround.hpp>
#include <cstddef> //for std::size_t
#if defined(__GNUC__) && !defined(__GXX_EXPERIMENTAL_CXX0X__)
//
// This is horrible, but it seems to be the only we can shut up the
// "anonymous variadic macros were introduced in C99 [-Wvariadic-macros]"
// warning that get spewed out otherwise in non-C++11 mode.
//
#pragma GCC system_header
#endif
#ifndef BOOST_NO_CXX11_STATIC_ASSERT
# ifndef BOOST_NO_CXX11_VARIADIC_MACROS
# define BOOST_STATIC_ASSERT_MSG( ... ) static_assert(__VA_ARGS__)
# else
# define BOOST_STATIC_ASSERT_MSG( B, Msg ) static_assert( B, Msg )
# endif
#else
# define BOOST_STATIC_ASSERT_MSG( B, Msg ) BOOST_STATIC_ASSERT( B )
#endif
#ifdef BOOST_BORLANDC
//
// workaround for buggy integral-constant expression support:
#define BOOST_BUGGY_INTEGRAL_CONSTANT_EXPRESSIONS
#endif
#if defined(__GNUC__) && (__GNUC__ == 3) && ((__GNUC_MINOR__ == 3) || (__GNUC_MINOR__ == 4))
// gcc 3.3 and 3.4 don't produce good error messages with the default version:
# define BOOST_SA_GCC_WORKAROUND
#endif
//
// If the compiler issues warnings about old C style casts,
// then enable this:
//
#if defined(__GNUC__) && ((__GNUC__ > 3) || ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 4)))
# ifndef BOOST_NO_CXX11_VARIADIC_MACROS
# define BOOST_STATIC_ASSERT_BOOL_CAST( ... ) ((__VA_ARGS__) != 0)
# else
# define BOOST_STATIC_ASSERT_BOOL_CAST( x ) ((x) != 0)
# endif
#else
# ifndef BOOST_NO_CXX11_VARIADIC_MACROS
# define BOOST_STATIC_ASSERT_BOOL_CAST( ... ) (bool)(__VA_ARGS__)
# else
# define BOOST_STATIC_ASSERT_BOOL_CAST(x) (bool)(x)
# endif
#endif
#ifndef BOOST_NO_CXX11_STATIC_ASSERT
# ifndef BOOST_NO_CXX11_VARIADIC_MACROS
# define BOOST_STATIC_ASSERT( ... ) static_assert(__VA_ARGS__, #__VA_ARGS__)
# else
# define BOOST_STATIC_ASSERT( B ) static_assert(B, #B)
# endif
#else
namespace boost{
// HP aCC cannot deal with missing names for template value parameters
template <bool x> struct STATIC_ASSERTION_FAILURE;
template <> struct STATIC_ASSERTION_FAILURE<true> { enum { value = 1 }; };
// HP aCC cannot deal with missing names for template value parameters
template<std::size_t x> struct static_assert_test{};
}
//
// Implicit instantiation requires that all member declarations be
// instantiated, but that the definitions are *not* instantiated.
//
// It's not particularly clear how this applies to enum's or typedefs;
// both are described as declarations [7.1.3] and [7.2] in the standard,
// however some compilers use "delayed evaluation" of one or more of
// these when implicitly instantiating templates. We use typedef declarations
// by default, but try defining BOOST_USE_ENUM_STATIC_ASSERT if the enum
// version gets better results from your compiler...
//
// Implementation:
// Both of these versions rely on sizeof(incomplete_type) generating an error
// message containing the name of the incomplete type. We use
// "STATIC_ASSERTION_FAILURE" as the type name here to generate
// an eye catching error message. The result of the sizeof expression is either
// used as an enum initialiser, or as a template argument depending which version
// is in use...
// Note that the argument to the assert is explicitly cast to bool using old-
// style casts: too many compilers currently have problems with static_cast
// when used inside integral constant expressions.
//
#if !defined(BOOST_BUGGY_INTEGRAL_CONSTANT_EXPRESSIONS)
#if defined(BOOST_MSVC) && defined(BOOST_NO_CXX11_VARIADIC_MACROS)
#define BOOST_STATIC_ASSERT( B ) \
typedef ::boost::static_assert_test<\
sizeof(::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST ( B ) >)>\
BOOST_JOIN(boost_static_assert_typedef_, __COUNTER__)
#elif defined(BOOST_MSVC)
#define BOOST_STATIC_ASSERT(...) \
typedef ::boost::static_assert_test<\
sizeof(::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST (__VA_ARGS__) >)>\
BOOST_JOIN(boost_static_assert_typedef_, __COUNTER__)
#elif (defined(BOOST_INTEL_CXX_VERSION) || defined(BOOST_SA_GCC_WORKAROUND)) && defined(BOOST_NO_CXX11_VARIADIC_MACROS)
// agurt 15/sep/02: a special care is needed to force Intel C++ issue an error
// instead of warning in case of failure
# define BOOST_STATIC_ASSERT( B ) \
typedef char BOOST_JOIN(boost_static_assert_typedef_, __LINE__) \
[ ::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST( B ) >::value ]
#elif (defined(BOOST_INTEL_CXX_VERSION) || defined(BOOST_SA_GCC_WORKAROUND)) && !defined(BOOST_NO_CXX11_VARIADIC_MACROS)
// agurt 15/sep/02: a special care is needed to force Intel C++ issue an error
// instead of warning in case of failure
# define BOOST_STATIC_ASSERT(...) \
typedef char BOOST_JOIN(boost_static_assert_typedef_, __LINE__) \
[ ::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST( __VA_ARGS__ ) >::value ]
#elif defined(__sgi)
// special version for SGI MIPSpro compiler
#define BOOST_STATIC_ASSERT( B ) \
BOOST_STATIC_CONSTANT(bool, \
BOOST_JOIN(boost_static_assert_test_, __LINE__) = ( B )); \
typedef ::boost::static_assert_test<\
sizeof(::boost::STATIC_ASSERTION_FAILURE< \
BOOST_JOIN(boost_static_assert_test_, __LINE__) >)>\
BOOST_JOIN(boost_static_assert_typedef_, __LINE__)
#elif BOOST_WORKAROUND(__MWERKS__, <= 0x3003)
// special version for CodeWarrior <= 8.x
#define BOOST_STATIC_ASSERT( B ) \
BOOST_STATIC_CONSTANT(int, \
BOOST_JOIN(boost_static_assert_test_, __LINE__) = \
sizeof(::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST( B ) >) )
#else
// generic version
# ifndef BOOST_NO_CXX11_VARIADIC_MACROS
# define BOOST_STATIC_ASSERT( ... ) \
typedef ::boost::static_assert_test<\
sizeof(::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST( __VA_ARGS__ ) >)>\
BOOST_JOIN(boost_static_assert_typedef_, __LINE__) BOOST_ATTRIBUTE_UNUSED
# else
# define BOOST_STATIC_ASSERT( B ) \
typedef ::boost::static_assert_test<\
sizeof(::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST( B ) >)>\
BOOST_JOIN(boost_static_assert_typedef_, __LINE__) BOOST_ATTRIBUTE_UNUSED
# endif
#endif
#else
// alternative enum based implementation:
# ifndef BOOST_NO_CXX11_VARIADIC_MACROS
# define BOOST_STATIC_ASSERT( ... ) \
enum { BOOST_JOIN(boost_static_assert_enum_, __LINE__) \
= sizeof(::boost::STATIC_ASSERTION_FAILURE< (bool)( __VA_ARGS__ ) >) }
# else
# define BOOST_STATIC_ASSERT(B) \
enum { BOOST_JOIN(boost_static_assert_enum_, __LINE__) \
= sizeof(::boost::STATIC_ASSERTION_FAILURE< (bool)( B ) >) }
# endif
#endif
#endif // defined(BOOST_NO_CXX11_STATIC_ASSERT)
#endif // BOOST_STATIC_ASSERT_HPP