diff options
| author | Thiago Macieira <thiago.macieira@intel.com> | 2017-04-18 16:43:41 -0700 |
|---|---|---|
| committer | Thiago Macieira <thiago.macieira@intel.com> | 2017-06-07 15:54:31 +0000 |
| commit | d254d8c19714af69a9897bdd67c4e9aa3267c3a3 (patch) | |
| tree | 1b82236c071690ec3a5539e846f68bbd42dbcade /src/corelib/global/qcompilerdetection.h | |
| parent | 6ae801875ea3c654f808b7ed519b403807653068 (diff) | |
Use the C++ [[nodiscard]] attribute
Change-Id: I7814054a102a407d876ffffd14b6a285c70b21de
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Diffstat (limited to 'src/corelib/global/qcompilerdetection.h')
| -rw-r--r-- | src/corelib/global/qcompilerdetection.h | 67 |
1 files changed, 36 insertions, 31 deletions
diff --git a/src/corelib/global/qcompilerdetection.h b/src/corelib/global/qcompilerdetection.h index c221115e8f..9ffd164b61 100644 --- a/src/corelib/global/qcompilerdetection.h +++ b/src/corelib/global/qcompilerdetection.h @@ -1061,6 +1061,37 @@ #endif /* + * SG10's SD-6 feature detection and some useful extensions from Clang and GCC + * https://isocpp.org/std/standing-documents/sd-6-sg10-feature-test-recommendations + * http://clang.llvm.org/docs/LanguageExtensions.html#feature-checking-macros + */ +#ifdef __has_builtin +# define QT_HAS_BUILTIN(x) __has_builtin(x) +#else +# define QT_HAS_BUILTIN(x) 0 +#endif +#ifdef __has_attribute +# define QT_HAS_ATTRIBUTE(x) __has_attribute(x) +#else +# define QT_HAS_ATTRIBUTE(x) 0 +#endif +#ifdef __has_cpp_attribute +# define QT_HAS_CPP_ATTRIBUTE(x) __has_cpp_attribute(x) +#else +# define QT_HAS_CPP_ATTRIBUTE(x) 0 +#endif +#ifdef __has_include +# define QT_HAS_INCLUDE(x) __has_include(x) +#else +# define QT_HAS_INCLUDE(x) 0 +#endif +#ifdef __has_include_next +# define QT_HAS_INCLUDE_NEXT(x) __has_include_next(x) +#else +# define QT_HAS_INCLUDE_NEXT(x) 0 +#endif + +/* * C++11 keywords and expressions */ #ifdef Q_COMPILER_NULLPTR @@ -1141,6 +1172,11 @@ # define Q_DECL_ALIGN(n) alignas(n) #endif +#if QT_HAS_CPP_ATTRIBUTE(nodiscard) // P0188R1 +# undef Q_REQUIRED_RESULT +# define Q_REQUIRED_RESULT [[nodiscard]] +#endif + /* * Fallback macros to certain compiler features */ @@ -1215,37 +1251,6 @@ #ifndef QT_MAKE_CHECKED_ARRAY_ITERATOR # define QT_MAKE_CHECKED_ARRAY_ITERATOR(x, N) (x) #endif - -/* - * SG10's SD-6 feature detection and some useful extensions from Clang and GCC - * https://isocpp.org/std/standing-documents/sd-6-sg10-feature-test-recommendations - * http://clang.llvm.org/docs/LanguageExtensions.html#feature-checking-macros - */ -#ifdef __has_builtin -# define QT_HAS_BUILTIN(x) __has_builtin(x) -#else -# define QT_HAS_BUILTIN(x) 0 -#endif -#ifdef __has_attribute -# define QT_HAS_ATTRIBUTE(x) __has_attribute(x) -#else -# define QT_HAS_ATTRIBUTE(x) 0 -#endif -#ifdef __has_cpp_attribute -# define QT_HAS_CPP_ATTRIBUTE(x) __has_cpp_attribute(x) -#else -# define QT_HAS_CPP_ATTRIBUTE(x) 0 -#endif -#ifdef __has_include -# define QT_HAS_INCLUDE(x) __has_include(x) -#else -# define QT_HAS_INCLUDE(x) 0 -#endif -#ifdef __has_include_next -# define QT_HAS_INCLUDE_NEXT(x) __has_include_next(x) -#else -# define QT_HAS_INCLUDE_NEXT(x) 0 -#endif #ifdef __has_feature # define QT_HAS_FEATURE(x) __has_feature(x) #else |