Add qHash(QRegExp) and qHash(QRegularExpression)

QReg*Exp*s can be compared for equality,
so qHash should be overloaded, too.

There was a (poor) private implementation of qHash(QRegExpEngineKey)
already, which has now been replaced with a better one (the old one
didn't take into account all the fields that make up equality,
producing unnecessary collisions).

[ChangeLog][QtCore][QRegExp] Added qHash(QRegExp).
[ChangeLog][QtCore][QRegularExpression] Added qHash(QRegularExpression).

Change-Id: I1d22fbcc0508018a3f94b4c24571b13ba6e07df2
Reviewed-by: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/src/corelib/tools/qregularexpression.h b/src/corelib/tools/qregularexpression.h
index d2abfc7701..2bca6a211b 100644
--- a/src/corelib/tools/qregularexpression.h
+++ b/src/corelib/tools/qregularexpression.h
@@ -49,6 +49,9 @@ QT_BEGIN_NAMESPACE
 class QRegularExpressionMatch;
 class QRegularExpressionMatchIterator;
 struct QRegularExpressionPrivate;
+class QRegularExpression;
+
+Q_CORE_EXPORT uint qHash(const QRegularExpression &key, uint seed = 0) Q_DECL_NOTHROW;
 
 class Q_CORE_EXPORT QRegularExpression
 {
@@ -139,6 +142,7 @@ private:
     friend class QRegularExpressionMatch;
     friend struct QRegularExpressionMatchPrivate;
     friend class QRegularExpressionMatchIterator;
+    friend Q_CORE_EXPORT uint qHash(const QRegularExpression &key, uint seed) Q_DECL_NOTHROW;
 
     QRegularExpression(QRegularExpressionPrivate &dd);
     QExplicitlySharedDataPointer<QRegularExpressionPrivate> d;