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author | Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com> | 2016-02-17 17:51:49 +0000 |
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committer | The Qt Project <gerrit-noreply@qt-project.org> | 2016-02-17 19:57:54 +0000 |
commit | 86c5a337e3b123f2e41c8b15b416f39655519acd (patch) | |
tree | efa0f720a190889b3d31ddbd07cee0495b8a15d4 /src/corelib/global | |
parent | 47ca3f78139ad51a5018dcdad27fa5caf817f08d (diff) | |
parent | 6620045fcaada61a2897195f32c0ee35beebc37b (diff) |
Merge "Merge dev into 5.7" into refs/staging/5.7
Diffstat (limited to 'src/corelib/global')
-rw-r--r-- | src/corelib/global/qglobal.cpp | 43 | ||||
-rw-r--r-- | src/corelib/global/qglobal.h | 60 |
2 files changed, 103 insertions, 0 deletions
diff --git a/src/corelib/global/qglobal.cpp b/src/corelib/global/qglobal.cpp index a7ed29d859..e4fa0f7391 100644 --- a/src/corelib/global/qglobal.cpp +++ b/src/corelib/global/qglobal.cpp @@ -921,6 +921,49 @@ Q_STATIC_ASSERT_X(QT_POINTER_SIZE == sizeof(void *), "QT_POINTER_SIZE defined in \sa qMin(), qMax() */ +/*! \fn auto qOverload(T functionPointer) + \relates <QtGlobal> + \since 5.7 + + qOverload() returns a pointer to an overloaded function. The template + parameter is the list of the argument types of the function. + \a functionPointer is the pointer to the (member) function: + + \snippet code/src_corelib_global_qglobal.cpp 52 + + If a member function is also const-overladed \l qConstOverload and + \l qNonConstOverload needs to be used. + + qOverload() needs C++14 enabled. In C++11 only code the helper + classes QOverload, QConstOverload, and QNonConstOverload could be used directly: + + \snippet code/src_corelib_global_qglobal.cpp 53 + + \sa qConstOverload(), qNonConstOverload() +*/ + +/*! \fn auto qConstOverload(T memberFunctionPointer) + \relates <QtGlobal> + \since 5.7 + + qConstOverload() returns a pointer to an constant member function: + + \snippet code/src_corelib_global_qglobal.cpp 54 + + \sa qOverload, qNonConstOverload +*/ + +/*! \fn auto qNonConstOverload(T memberFunctionPointer) + \relates <QtGlobal> + \since 5.7 + + qNonConstOverload() eturns a pointer to an non constant member function: + + \snippet code/src_corelib_global_qglobal.cpp 54 + + \sa qOverload, qNonConstOverload +*/ + /*! \macro QT_VERSION_CHECK \relates <QtGlobal> diff --git a/src/corelib/global/qglobal.h b/src/corelib/global/qglobal.h index 69840996dc..d607b04192 100644 --- a/src/corelib/global/qglobal.h +++ b/src/corelib/global/qglobal.h @@ -1018,6 +1018,66 @@ Q_CORE_EXPORT QString qtTrId(const char *id, int n = -1); { return T::dynamic_cast_will_always_fail_because_rtti_is_disabled; } #endif + +#ifdef Q_QDOC + +// Just for documentation generation +auto qOverload(T functionPointer); +auto qConstOverload(T memberFunctionPointer); +auto qNonConstOverload(T memberFunctionPointer); + +#elif defined(Q_COMPILER_VARIADIC_TEMPLATES) + +template <typename... Args> +struct QNonConstOverload +{ + template <typename R, typename T> + Q_DECL_CONSTEXPR auto operator()(R (T::*ptr)(Args...)) const Q_DECL_NOTHROW -> decltype(ptr) + { return ptr; } + + template <typename R, typename T> + static Q_DECL_CONSTEXPR auto of(R (T::*ptr)(Args...)) Q_DECL_NOTHROW -> decltype(ptr) + { return ptr; } +}; + +template <typename... Args> +struct QConstOverload +{ + template <typename R, typename T> + Q_DECL_CONSTEXPR auto operator()(R (T::*ptr)(Args...) const) const Q_DECL_NOTHROW -> decltype(ptr) + { return ptr; } + + template <typename R, typename T> + static Q_DECL_CONSTEXPR auto of(R (T::*ptr)(Args...) const) Q_DECL_NOTHROW -> decltype(ptr) + { return ptr; } +}; + +template <typename... Args> +struct QOverload : QConstOverload<Args...>, QNonConstOverload<Args...> +{ + using QConstOverload<Args...>::of; + using QConstOverload<Args...>::operator(); + using QNonConstOverload<Args...>::of; + using QNonConstOverload<Args...>::operator(); + + template <typename R> + Q_DECL_CONSTEXPR auto operator()(R (*ptr)(Args...)) const Q_DECL_NOTHROW -> decltype(ptr) + { return ptr; } + + template <typename R> + static Q_DECL_CONSTEXPR auto of(R (*ptr)(Args...)) Q_DECL_NOTHROW -> decltype(ptr) + { return ptr; } +}; + +#if defined(__cpp_variable_templates) && __cpp_variable_templates >= 201304 // C++14 +template <typename... Args> Q_CONSTEXPR QOverload<Args...> qOverload Q_DECL_UNUSED = {}; +template <typename... Args> Q_CONSTEXPR QConstOverload<Args...> qConstOverload Q_DECL_UNUSED = {}; +template <typename... Args> Q_CONSTEXPR QNonConstOverload<Args...> qNonConstOverload Q_DECL_UNUSED = {}; +#endif + +#endif + + class QByteArray; Q_CORE_EXPORT QByteArray qgetenv(const char *varName); Q_CORE_EXPORT bool qputenv(const char *varName, const QByteArray& value); |