added wxArrayString::swap()

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@55549 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/changes.txt

@@ -291,6 +291,7 @@ All:
 - Corrected bug in wxTimeSpan::IsShorterThan() for equal time spans.
 - Use std::unordered_{map,set} for wxHashMap/Set if available (Jan van Dijk).
 - Added wxString::Capitalize() and MakeCapitalized().
+- Added wxArrayString::swap().
 - Added wxSHUTDOWN_LOGOFF and wxSHUTDOWN_FORCE wxShutdown() flags (troelsk).
 
 All (Unix):

include/wx/arrstr.h

@@ -301,6 +301,25 @@ public:
   void reserve(size_type n) /* base::reserve*/;
   void resize(size_type n, value_type v = value_type());
   size_type size() const { return GetCount(); }
+  void swap(wxArrayString& other)
+  {
+      // not sure if we can rely on having std::swap() everywhere so do it
+      // manually
+      const size_t savedSize = m_nSize;
+      const size_t savedCount = m_nCount;
+      wxString * const savedItems = m_pItems;
+      const bool savedAutoSort = m_autoSort;
+
+      m_nSize = other.m_nSize;
+      m_nCount = other.m_nCount;
+      m_pItems = other.m_pItems;
+      m_autoSort = other.m_autoSort;
+
+      other.m_nSize = savedSize;
+      other.m_nCount = savedCount;
+      other.m_pItems = savedItems;
+      other.m_autoSort = savedAutoSort;
+  }
 
 protected:
   void Init(bool autoSort);             // common part of all ctors

tests/arrays/arrays.cpp

@@ -170,6 +170,7 @@ private:
         CPPUNIT_TEST( wxArrayCharTest );
         CPPUNIT_TEST( TestSTL );
         CPPUNIT_TEST( Alloc );
+        CPPUNIT_TEST( Swap );
     CPPUNIT_TEST_SUITE_END();
 
     void wxStringArrayTest();
@@ -182,6 +183,7 @@ private:
     void wxArrayCharTest();
     void TestSTL();
     void Alloc();
+    void Swap();
 
     DECLARE_NO_COPY_CLASS(ArraysTestCase)
 };
@@ -555,6 +557,28 @@ void ArraysTestCase::Alloc()
     CPPUNIT_ASSERT_EQUAL( 9, a[1] );
 }
 
+void ArraysTestCase::Swap()
+{
+    wxArrayString a1, a2;
+    a1.swap(a2);
+    CPPUNIT_ASSERT( a1.empty() && a2.empty() );
+
+    a1.push_back("Foo");
+    a1.swap(a2);
+    CPPUNIT_ASSERT( a1.empty() );
+    CPPUNIT_ASSERT_EQUAL( 1, a2.size() );
+
+    a1.push_back("Bar");
+    a1.push_back("Baz");
+    a2.swap(a1);
+    CPPUNIT_ASSERT_EQUAL( 1, a1.size() );
+    CPPUNIT_ASSERT_EQUAL( 2, a2.size() );
+
+    a1.swap(a2);
+    CPPUNIT_ASSERT_EQUAL( 2, a1.size() );
+    CPPUNIT_ASSERT_EQUAL( 1, a2.size() );
+}
+
 void ArraysTestCase::TestSTL()
 {
     wxArrayInt list1;