QList: add STL-style assign()

Implemented assign() methods for QList to align with the criteria of
std::vector, addressing the previously missing functionality.

Reference:
https://en.cppreference.com/w/cpp/container/vector/assign

[ChangeLog][QtCore][QList] Added assign().

Fixes: QTBUG-106196
Change-Id: I5df8689c020dafde68d2cd7d09c769744fa8f137
Reviewed-by: Marc Mutz <marc.mutz@qt.io>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>

1 files changed, 5 insertions, 0 deletions

diff --git a/tests/auto/corelib/tools/containerapisymmetry/tst_containerapisymmetry.cpp b/tests/auto/corelib/tools/containerapisymmetry/tst_containerapisymmetry.cpp
index f3909cd4e8..24f5dba17e 100644
--- a/tests/auto/corelib/tools/containerapisymmetry/tst_containerapisymmetry.cpp
+++ b/tests/auto/corelib/tools/containerapisymmetry/tst_containerapisymmetry.cpp
@@ -338,6 +338,7 @@ private:
 private Q_SLOTS:
     void assign_std_vector() { assign_impl<std::vector<int>>(); };
     void assign_QVarLengthArray() { assign_impl<QVarLengthArray<int, 4>>(); };
+    void assign_QList() { assign_impl<QList<int>>(); }
 
 private:
     template <typename Container>
@@ -802,6 +803,10 @@ void tst_ContainerApiSymmetry::assign_impl() const
         iter.assign(8, tData);
         c.assign(iter.begin(), iter.end());
         CHECK(c, tData, c.size(), S(8), c.capacity(), std::max(oldCapacity, S(8)));
+
+        c.assign(iter.begin(), iter.begin());
+        QCOMPARE_EQ(c.size(), S(0));
+        QCOMPARE_EQ(c.capacity(), std::max(oldCapacity, S(8)));
     }
     {
         // range version for input iterator