diff options
author | Jędrzej Nowacki <jedrzej.nowacki@nokia.com> | 2012-06-04 16:52:32 +0200 |
---|---|---|
committer | Qt by Nokia <qt-info@nokia.com> | 2012-07-27 03:27:27 +0200 |
commit | 9b95ed1fe39853534b859a64095febeaf0975cf7 (patch) | |
tree | b331d00d5305a0b4d334d13af256e2af5db1f28f /src/corelib | |
parent | 0feb2646748a65bafea8485104a2d5833c0d1558 (diff) |
Introduce QTypeInfoMerger.
QTypeInfoMerger class was created to allow "inheriting" QTypeInfo
traits. The class implementation was based on the QTypeInfo<QPair<>>
specialization, therefore the specialization was refactored to
use the new class.
Change-Id: I4ff3e5eac1d55da086dad84274cce2b2c0a721be
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>
Reviewed-by: Stephen Kelly <stephen.kelly@kdab.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Diffstat (limited to 'src/corelib')
-rw-r--r-- | src/corelib/doc/snippets/code/src_corelib_global_qglobal.cpp | 14 | ||||
-rw-r--r-- | src/corelib/global/qtypeinfo.h | 32 | ||||
-rw-r--r-- | src/corelib/tools/qpair.h | 13 |
3 files changed, 47 insertions, 12 deletions
diff --git a/src/corelib/doc/snippets/code/src_corelib_global_qglobal.cpp b/src/corelib/doc/snippets/code/src_corelib_global_qglobal.cpp index dc6c3aa616..8feac30d1d 100644 --- a/src/corelib/doc/snippets/code/src_corelib_global_qglobal.cpp +++ b/src/corelib/doc/snippets/code/src_corelib_global_qglobal.cpp @@ -538,6 +538,20 @@ CApaApplication *myApplicationFactory(); void myMessageHandler(QtMsgType, const QMessageLogContext &, const char *); //! [49] +//! [50] +class B {...}; +class C {...}; +class D {...}; +struct A : public B { + C c; + D d; +}; +//! [50] + +//! [51] +template<> class QTypeInfo<A> : public QTypeInfoMerger<A, B, C, D> {}; +//! [51] + //! [qlikely] // the condition inside the "if" will be successful most of the times for (int i = 1; i <= 365; i++) { diff --git a/src/corelib/global/qtypeinfo.h b/src/corelib/global/qtypeinfo.h index 4255548b0d..e8aa883c9d 100644 --- a/src/corelib/global/qtypeinfo.h +++ b/src/corelib/global/qtypeinfo.h @@ -97,6 +97,38 @@ public: }; }; +/*! + \class QTypeInfoMerger + \internal + + \brief QTypeInfoMerger merges the QTypeInfo flags of T1, T2... and presents them + as a QTypeInfo<T> would do. + + Let's assume that we have a simple set of structs: + + \snippet code/src_corelib_global_qglobal.cpp 50 + + To create a proper QTypeInfo specialization for A struct, we have to check + all sub-components; B, C and D, then take the lowest common denominator and call + Q_DECLATE_TYPEINFO with the resulting flags. An easier and less fragile approach is to + use QTypeInfoMerger, which does that automatically. So struct A would have + the following QTypeInfo definition: + + \snippet code/src_corelib_global_qglobal.cpp 51 +*/ +template <class T, class T1, class T2 = T1, class T3 = T1, class T4 = T1> +class QTypeInfoMerger +{ +public: + enum { + isComplex = QTypeInfo<T1>::isComplex || QTypeInfo<T2>::isComplex || QTypeInfo<T3>::isComplex || QTypeInfo<T4>::isComplex, + isStatic = QTypeInfo<T1>::isStatic || QTypeInfo<T2>::isStatic || QTypeInfo<T3>::isStatic || QTypeInfo<T4>::isStatic, + isLarge = sizeof(T) > sizeof(void*), + isPointer = false, + isDummy = false, + sizeOf = sizeof(T) + }; +}; #define Q_DECLARE_MOVABLE_CONTAINER(CONTAINER) \ template <typename T> class CONTAINER; \ diff --git a/src/corelib/tools/qpair.h b/src/corelib/tools/qpair.h index f8455339f3..b73bf6706a 100644 --- a/src/corelib/tools/qpair.h +++ b/src/corelib/tools/qpair.h @@ -66,18 +66,7 @@ struct QPair // mark QPair<T1,T2> as complex/movable/primitive depending on the // typeinfos of the constituents: template<class T1, class T2> -class QTypeInfo< QPair<T1, T2> > -{ -public: - enum { - isComplex = QTypeInfo<T1>::isComplex || QTypeInfo<T2>::isComplex, - isStatic = QTypeInfo<T1>::isStatic || QTypeInfo<T2>::isStatic, - isLarge = sizeof(QPair<T1, T2>) > sizeof(void*), - isPointer = false, - isDummy = false, - sizeOf = sizeof(QPair<T1, T2>) - }; -}; +class QTypeInfo<QPair<T1, T2> > : public QTypeInfoMerger<QPair<T1, T2>, T1, T2> {}; // Q_DECLARE_TYPEINFO template <class T1, class T2> Q_INLINE_TEMPLATE bool operator==(const QPair<T1, T2> &p1, const QPair<T1, T2> &p2) |