| 1 | // ============================================================= // |
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| 2 | // // |
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| 3 | // File : static_assert.h // |
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| 4 | // Purpose : compile time assertion // |
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| 5 | // // |
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| 6 | // Institute of Microbiology (Technical University Munich) // |
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| 7 | // http://www.arb-home.de/ // |
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| 8 | // // |
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| 9 | // ============================================================= // |
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| 10 | |
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| 11 | #ifndef STATIC_ASSERT_H |
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| 12 | #define STATIC_ASSERT_H |
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| 13 | |
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| 14 | #ifndef CXXFORWARD_H |
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| 15 | #include <cxxforward.h> |
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| 16 | #endif |
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| 17 | #ifndef STRINGIZE_H |
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| 18 | #include "stringize.h" |
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| 19 | #endif |
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| 20 | |
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| 21 | #if defined (Cxx11) |
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| 22 | |
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| 23 | #define STATIC_ASSERT(const_expression) static_assert(const_expression,#const_expression) |
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| 24 | #define STATIC_ASSERT_ANNOTATED(const_expression,failReason) static_assert(const_expression,failReason) |
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| 25 | |
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| 26 | #else |
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| 27 | |
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| 28 | namespace arb_compile_assertion { |
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| 29 | template <bool> struct is; |
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| 30 | template <> struct is<true> { enum { value = 1 }; }; |
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| 31 | template<int x> struct static_assert_test{}; |
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| 32 | } |
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| 33 | |
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| 34 | #define CA_UNIQUETYPE(typename) concatenate_pscans(typename,__LINE__) |
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| 35 | #define COMPILE_ASSERTED_TYPE(const_expression) ::arb_compile_assertion::static_assert_test<sizeof(::arb_compile_assertion::is< (bool)( const_expression ) >)> |
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| 36 | #define ASSERT_VIA_IS(type_definition,type_id) typedef type_definition type_id; struct concatenate(using_,type_id) { type_id instance; } |
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| 37 | #define STATIC_ASSERT(const_expression) ASSERT_VIA_IS(COMPILE_ASSERTED_TYPE(const_expression), CA_UNIQUETYPE(_arb_compile_assertion_typedef_)) |
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| 38 | #define STATIC_ASSERT_ANNOTATED(const_expression,annotation) STATIC_ASSERT(const_expression) |
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| 39 | |
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| 40 | #endif |
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| 41 | |
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| 42 | #else |
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| 43 | #error static_assert.h included twice |
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| 44 | #endif // STATIC_ASSERT_H |
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