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| 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 | namespace arb_compile_assertion { |
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| 15 | template <bool> struct is; |
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| 16 | template <> struct is<true> { enum { value = 1 }; }; |
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| 17 | template<int x> struct static_assert_test{}; |
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| 18 | } |
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| 19 | |
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| 20 | #define CA_JOIN(X,Y) X##Y |
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| 21 | #define CA_JOINTYPE(X,Y) CA_JOIN(X, Y) |
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| 22 | #define CA_UNIQUETYPE(typename) CA_JOINTYPE(typename,__LINE__) |
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| 23 | |
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| 24 | #define COMPILE_ASSERTED_TYPE(const_expression) ::arb_compile_assertion::static_assert_test<sizeof(::arb_compile_assertion::is< (bool)( const_expression ) >)> |
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| 25 | #define COMPILE_ASSERT(const_expression) typedef COMPILE_ASSERTED_TYPE(const_expression) CA_UNIQUETYPE(_arb_compile_assertion_typedef_) |
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| 26 | |
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| 27 | #else |
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| 28 | #error static_assert.h included twice |
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| 29 | #endif // STATIC_ASSERT_H |
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