Add qHash(QLocale)

QLocales can be compared for equality,
so qHash should be overloaded, too.

[ChangeLog][QtCore][QLocale] Added qHash(QLocale).

Change-Id: Ia0fdf1207b842b9bb20b8f9ab0165016915debf4
Reviewed-by: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/corelib/tools/qlocale.cpp

@@ -42,6 +42,7 @@
 
 #include "qdatastream.h"
 #include "qdebug.h"
+#include "qhashfunctions.h"
 #include "qstring.h"
 #include "qlocale.h"
 #include "qlocale_p.h"
@@ -865,6 +866,21 @@ bool QLocale::operator!=(const QLocale &other) const
     return d->m_data != other.d->m_data || d->m_numberOptions != other.d->m_numberOptions;
 }
 
+/*!
+    \since 5.6
+    \relates QLocale
+
+    Returns the hash value for \a key, using
+    \a seed to seed the calculation.
+*/
+uint qHash(const QLocale &key, uint seed) Q_DECL_NOTHROW
+{
+    QtPrivate::QHashCombine hash;
+    seed = hash(seed, key.d->m_data);
+    seed = hash(seed, key.d->m_numberOptions);
+    return seed;
+}
+
 /*!
     \since 4.2
 

src/corelib/tools/qlocale.h

@@ -45,6 +45,7 @@ QT_BEGIN_NAMESPACE
 class QDataStream;
 class QDate;
 class QDateTime;
+class QLocale;
 class QTime;
 class QVariant;
 class QTextStream;
@@ -52,6 +53,8 @@ class QTextStreamPrivate;
 
 class QLocalePrivate;
 
+Q_CORE_EXPORT uint qHash(const QLocale &key, uint seed = 0) Q_DECL_NOTHROW;
+
 class Q_CORE_EXPORT QLocale
 {
     Q_GADGET
@@ -979,6 +982,8 @@ public:
 private:
     QLocale(QLocalePrivate &dd);
     friend class QLocalePrivate;
+    friend Q_CORE_EXPORT uint qHash(const QLocale &key, uint seed) Q_DECL_NOTHROW;
+
     QSharedDataPointer<QLocalePrivate> d;
 };
 Q_DECLARE_TYPEINFO(QLocale, Q_MOVABLE_TYPE);

tests/auto/corelib/tools/qlocale/tst_qlocale.cpp

@@ -371,6 +371,8 @@ void tst_QLocale::ctor()
                 QString("requested: \"" + QString(req_lc) + "\", got: " \
                 + QLocale::languageToString(l.language()) \
                 + "/" + QLocale::countryToString(l.country())).toLatin1().constData()); \
+        QCOMPARE(l, QLocale(QLocale::exp_lang, QLocale::exp_country)); \
+        QCOMPARE(qHash(l), qHash(QLocale(QLocale::exp_lang, QLocale::exp_country))); \
     }
 
     QLocale::setDefault(QLocale(QLocale::C));