diff options
author | Jędrzej Nowacki <jedrzej.nowacki@nokia.com> | 2012-06-04 16:52:32 +0200 |
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committer | Qt by Nokia <qt-info@nokia.com> | 2012-07-27 03:27:27 +0200 |
commit | 9b95ed1fe39853534b859a64095febeaf0975cf7 (patch) | |
tree | b331d00d5305a0b4d334d13af256e2af5db1f28f /src/corelib/global | |
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/global')
-rw-r--r-- | src/corelib/global/qtypeinfo.h | 32 |
1 files changed, 32 insertions, 0 deletions
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; \ |