| // (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> |
| |
| #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 ) BOOST_STATIC_ASSERT( B ) |
| # endif |
| #else |
| # define BOOST_STATIC_ASSERT_MSG( B, Msg ) BOOST_STATIC_ASSERT( B ) |
| #endif |
| |
| #ifdef __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 ? false : true) |
| # else |
| # define BOOST_STATIC_ASSERT_BOOL_CAST( x ) ((x) == 0 ? false : true) |
| # 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 |
| // |
| // If the compiler warns about unused typedefs then enable this: |
| // |
| #if defined(__GNUC__) && ((__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 7))) |
| # define BOOST_STATIC_ASSERT_UNUSED_ATTRIBUTE __attribute__((unused)) |
| #else |
| # define BOOST_STATIC_ASSERT_UNUSED_ATTRIBUTE |
| #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<int 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) && (BOOST_MSVC < 1300) |
| // __LINE__ macro broken when -ZI is used see Q199057 |
| // fortunately MSVC ignores duplicate typedef's. |
| #define BOOST_STATIC_ASSERT( B ) \ |
| typedef ::boost::static_assert_test<\ |
| sizeof(::boost::STATIC_ASSERTION_FAILURE< (bool)( B ) >)\ |
| > boost_static_assert_typedef_ |
| #elif 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_STATIC_ASSERT_UNUSED_ATTRIBUTE |
| # 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_STATIC_ASSERT_UNUSED_ATTRIBUTE |
| # 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 |
| |
| |