QVector: add relational operators <,<=,>,>=

std::vector has them, too.

[ChangeLog][QtCore][QVector] Added relational operators <, <=, >, >= if the element
type supports operator<.

Change-Id: I0bcb22dfcc43cb0362f17b4e06154ce18646580a
Reviewed-by: Kai Koehne <kai.koehne@theqtcompany.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

1 files changed, 48 insertions, 0 deletions

diff --git a/src/corelib/tools/qvector.cpp b/src/corelib/tools/qvector.cpp
index d10f82fbb4..de29fb3cf5 100644
--- a/src/corelib/tools/qvector.cpp
+++ b/src/corelib/tools/qvector.cpp
@@ -290,6 +290,54 @@
     \sa operator==()
 */
 
+/*! \fn bool operator<(const QVector<T> &lhs, const QVector<T> &rhs)
+    \since 5.6
+    \relates QVector
+
+    Returns \c true if vector \a lhs is
+    \l{http://en.cppreference.com/w/cpp/algorithm/lexicographical_compare}
+    {lexicographically less than} \a rhs; otherwise returns \c false.
+
+    This function requires the value type to have an implementation
+    of \c operator<().
+*/
+
+/*! \fn bool operator<=(const QVector<T> &lhs, const QVector<T> &rhs)
+    \since 5.6
+    \relates QVector
+
+    Returns \c true if vector \a lhs is
+    \l{http://en.cppreference.com/w/cpp/algorithm/lexicographical_compare}
+    {lexicographically less than or equal to} \a rhs; otherwise returns \c false.
+
+    This function requires the value type to have an implementation
+    of \c operator<().
+*/
+
+/*! \fn bool operator>(const QVector<T> &lhs, const QVector<T> &rhs)
+    \since 5.6
+    \relates QVector
+
+    Returns \c true if vector \a lhs is
+    \l{http://en.cppreference.com/w/cpp/algorithm/lexicographical_compare}
+    {lexicographically greater than} \a rhs; otherwise returns \c false.
+
+    This function requires the value type to have an implementation
+    of \c operator<().
+*/
+
+/*! \fn bool operator>=(const QVector<T> &lhs, const QVector<T> &rhs)
+    \since 5.6
+    \relates QVector
+
+    Returns \c true if vector \a lhs is
+    \l{http://en.cppreference.com/w/cpp/algorithm/lexicographical_compare}
+    {lexicographically greater than or equal to} \a rhs; otherwise returns \c false.
+
+    This function requires the value type to have an implementation
+    of \c operator<().
+*/
+
 /*! \fn int QVector::size() const
 
     Returns the number of items in the vector.