2 files changed, 55 insertions, 0 deletions
diff --git a/src/corelib/tools/qstringview.cpp b/src/corelib/tools/qstringview.cpp
index fe00965a5c..ec77e11740 100644
--- a/src/corelib/tools/qstringview.cpp
+++ b/src/corelib/tools/qstringview.cpp
@@ -548,4 +548,50 @@ QT_BEGIN_NAMESPACE
     \sa back(), front(), first()
 */
 
+/*!
+    \fn QStringView QStringView::mid(size_type start) const
+
+    Returns the substring starting at position \a start in this object,
+    and extending to the end of the string.
+
+    \note The behavior is undefined when \a start < 0 or \a start > size().
+
+    \sa left(), right()
+*/
+
+/*!
+    \fn QStringView QStringView::mid(size_type start, size_type length) const
+    \overload
+
+    Returns the substring of length \a length starting at position
+    \a start in this object.
+
+    \note The behavior is undefined when \a start < 0, \a length < 0,
+    or \a start + \a length > size().
+
+    \sa left(), right()
+*/
+
+/*!
+    \fn QStringView QStringView::left(size_type length) const
+
+    Returns the substring of length \a length starting at position
+    0 in this object.
+
+    \note The behavior is undefined when \a length < 0 or \a length > size().
+
+    \sa mid(), right()
+*/
+
+/*!
+    \fn QStringView QStringView::right(size_type length) const
+
+    Returns the substring of length \a length starting at position
+    size() - \a length in this object.
+
+    \note The behavior is undefined when \a length < 0 or \a length > size().
+
+    \sa mid(), left()
+*/
+
 QT_END_NAMESPACE
diff --git a/src/corelib/tools/qstringview.h b/src/corelib/tools/qstringview.h
index b1722e4657..1eb267f78e 100644
--- a/src/corelib/tools/qstringview.h
+++ b/src/corelib/tools/qstringview.h
@@ -183,6 +183,15 @@ public:
 
     Q_DECL_CONSTEXPR QChar at(size_type n) const { return (*this)[n]; }
 
+    Q_DECL_CONSTEXPR QStringView mid(size_type pos) const
+    { return Q_ASSERT(pos >= 0), Q_ASSERT(pos <= size()), QStringView(m_data + pos, m_size - pos); }
+    Q_DECL_CONSTEXPR QStringView mid(size_type pos, size_type n) const
+    { return Q_ASSERT(pos >= 0), Q_ASSERT(n >= 0), Q_ASSERT(pos + n <= size()), QStringView(m_data + pos, n); }
+    Q_DECL_CONSTEXPR QStringView left(size_type n) const
+    { return Q_ASSERT(n >= 0), Q_ASSERT(n <= size()), QStringView(m_data, n); }
+    Q_DECL_CONSTEXPR QStringView right(size_type n) const
+    { return Q_ASSERT(n >= 0), Q_ASSERT(n <= size()), QStringView(m_data + m_size - n, n); }
+
     //
     // STL compatibility API:
     //