| 1 | // ================================================================ // |
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| 2 | // // |
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| 3 | // File : cxxforward.h // |
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| 4 | // Purpose : macros for forward usage of C++11 features // |
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| 5 | // w/o loosing compatibility to C++03 compilers // |
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| 6 | // // |
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| 7 | // Coded by Ralf Westram (coder@reallysoft.de) in December 2012 // |
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| 8 | // Institute of Microbiology (Technical University Munich) // |
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| 9 | // http://www.arb-home.de/ // |
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| 10 | // // |
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| 11 | // ================================================================ // |
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| 12 | |
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| 13 | #ifndef CXXFORWARD_H |
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| 14 | #define CXXFORWARD_H |
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| 15 | |
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| 16 | #ifndef GCCVER_H |
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| 17 | #include "gccver.h" |
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| 18 | #endif |
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| 19 | |
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| 20 | #if defined(__cplusplus) |
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| 21 | # if (GCC_VERSION_CODE >= 407) |
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| 22 | # if (__cplusplus == 199711L) |
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| 23 | # else |
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| 24 | # if (__cplusplus == 201103L) |
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| 25 | # define ARB_ENABLE_Cxx11_FEATURES |
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| 26 | # else |
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| 27 | # error Unknown C++ standard defined in __cplusplus |
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| 28 | # endif |
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| 29 | # endif |
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| 30 | # endif |
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| 31 | #else |
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| 32 | # warning C compilation includes cxxforward.h |
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| 33 | #endif |
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| 34 | |
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| 35 | |
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| 36 | #ifdef ARB_ENABLE_Cxx11_FEATURES |
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| 37 | |
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| 38 | // C++11 is enabled starting with gcc 4.7 in ../Makefile@USE_Cxx11 |
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| 39 | // |
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| 40 | // Full support for C++11 is available starting with gcc 4.8. |
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| 41 | // Use #ifdef Cxx11 to insert conditional sections using full C++11 |
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| 42 | # if (GCC_VERSION_CODE >= 408) |
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| 43 | # define Cxx11 1 |
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| 44 | # endif |
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| 45 | |
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| 46 | // allows static member initialisation in class definition: |
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| 47 | # define CONSTEXPR constexpr |
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| 48 | # define CONSTEXPR_RETURN constexpr |
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| 49 | |
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| 50 | // allows to protect overloading functions against signature changes of overload functions: |
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| 51 | # define OVERRIDE override |
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| 52 | |
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| 53 | #else |
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| 54 | // backward (non C++11) compatibility defines: |
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| 55 | # define CONSTEXPR const |
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| 56 | # define CONSTEXPR_RETURN |
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| 57 | # define OVERRIDE |
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| 58 | |
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| 59 | #endif |
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| 60 | |
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| 61 | #else |
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| 62 | #error cxxforward.h included twice |
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| 63 | #endif // CXXFORWARD_H |
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