qSwap: use std::swap as implementation, and specialize std::swap for our container

std::swap might be reimplemented for many types. That might speedup
our Qt algorithms that uses qSwap. (std::swap also use std::move)

Specialize std::swap for our shared type, so stl algorithls work faster

Reviewed-by: Joao

3 files changed, 36 insertions, 0 deletions

diff --git a/src/corelib/tools/qscopedpointer.h b/src/corelib/tools/qscopedpointer.h
index 40d3851..a24cc71 100644
--- a/src/corelib/tools/qscopedpointer.h
+++ b/src/corelib/tools/qscopedpointer.h
@@ -186,6 +186,18 @@ template <class T, class Cleanup>
 Q_INLINE_TEMPLATE void qSwap(QScopedPointer<T, Cleanup> &p1, QScopedPointer<T, Cleanup> &p2)
 { p1.swap(p2); }
 
+#ifndef QT_NO_STL
+QT_END_NAMESPACE
+namespace std {
+    template <class T, class Cleanup>
+    Q_INLINE_TEMPLATE void swap(QScopedPointer<T, Cleanup> &p1, QScopedPointer<T, Cleanup> &p2)
+    { p1.swap(p2); }
+}
+QT_BEGIN_NAMESPACE
+#endif
+
+
+
 namespace QtPrivate {
     template <typename X, typename Y> struct QScopedArrayEnsureSameType;
     template <typename X> struct QScopedArrayEnsureSameType<X,X> { typedef X* Type; };
diff --git a/src/corelib/tools/qshareddata.h b/src/corelib/tools/qshareddata.h
index b646a9d..1079595 100644
--- a/src/corelib/tools/qshareddata.h
+++ b/src/corelib/tools/qshareddata.h
@@ -263,6 +263,20 @@ template <class T>
 Q_INLINE_TEMPLATE void qSwap(QExplicitlySharedDataPointer<T> &p1, QExplicitlySharedDataPointer<T> &p2)
 { p1.swap(p2); }
 
+#ifndef QT_NO_STL
+QT_END_NAMESPACE
+namespace std {
+    template <class T>
+    Q_INLINE_TEMPLATE void swap(QSharedDataPointer<T> &p1, QSharedDataPointer<T> &p2)
+    { p1.swap(p2); }
+
+    template <class T>
+    Q_INLINE_TEMPLATE void swap(QExplicitlySharedDataPointer<T> &p1, QExplicitlySharedDataPointer<T> &p2)
+    { p1.swap(p2); }
+}
+QT_BEGIN_NAMESPACE
+#endif
+
 QT_END_NAMESPACE
 
 QT_END_HEADER
diff --git a/src/corelib/tools/qsharedpointer_impl.h b/src/corelib/tools/qsharedpointer_impl.h
index 4b47713..965ac14 100644
--- a/src/corelib/tools/qsharedpointer_impl.h
+++ b/src/corelib/tools/qsharedpointer_impl.h
@@ -784,6 +784,16 @@ inline void qSwap(QSharedPointer<T> &p1, QSharedPointer<T> &p2)
     p1.swap(p2);
 }
 
+#ifndef QT_NO_STL
+QT_END_NAMESPACE
+namespace std {
+    template <class T>
+    inline void swap(QSharedPointer<T> &p1, QSharedPointer<T> &p2)
+    { p1.swap(p2); }
+}
+QT_BEGIN_NAMESPACE
+#endif
+
 namespace QtSharedPointer {
 // helper functions:
     template <class X, class T>