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author | Simon Hausmann <simon.hausmann@theqtcompany.com> | 2015-06-04 05:56:06 +0000 |
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committer | The Qt Project <gerrit-noreply@qt-project.org> | 2015-06-04 05:56:06 +0000 |
commit | ccad00121d0a9d703cf715c54347b32bfc33bbfc (patch) | |
tree | 8e492f00f9ea81d87ae9126ad06c3dbc21fee3a3 /src/corelib/global/qtypetraits.h | |
parent | dc2617f35be61b4827b8e3d192c85e2feacf7f6a (diff) | |
parent | e2f66f921594b7be4af4a058c959557489e86879 (diff) |
Merge "Merge remote-tracking branch 'origin/5.5' into dev" into refs/staging/dev
Diffstat (limited to 'src/corelib/global/qtypetraits.h')
-rw-r--r-- | src/corelib/global/qtypetraits.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/src/corelib/global/qtypetraits.h b/src/corelib/global/qtypetraits.h index 3a305713e6..488e257e0f 100644 --- a/src/corelib/global/qtypetraits.h +++ b/src/corelib/global/qtypetraits.h @@ -506,6 +506,27 @@ Q_STATIC_ASSERT((!is_unsigned<qint64>::value)); Q_STATIC_ASSERT((!is_signed<quint64>::value)); Q_STATIC_ASSERT(( is_signed<qint64>::value)); +template<class T = void> struct is_default_constructible; + +template<> struct is_default_constructible<void> +{ +protected: + template<bool> struct test { typedef char type; }; +public: + static bool const value = false; +}; +template<> struct is_default_constructible<>::test<true> { typedef double type; }; + +template<class T> struct is_default_constructible : is_default_constructible<> +{ +private: + template<class U> static typename test<!!sizeof(::new U())>::type sfinae(U*); + template<class U> static char sfinae(...); +public: + static bool const value = sizeof(sfinae<T>(0)) > 1; +}; + + } // namespace QtPrivate QT_END_NAMESPACE |