Add emplace tests for multiset/unordered_multiset.

This patch adds tests to ensure that multiset/unordered_multiset's emplace
method correctly constructs the elements without any intervening
constructions.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@346743 91177308-0d34-0410-b5e6-96231b3b80d8

test/std/containers/associative/multiset/insert_emplace_allocator_requirements.pass.cpp

@@ -23,4 +23,5 @@
 int main()
 {
   testMultisetInsert<TCT::multiset<> >();
+  testMultisetEmplace<TCT::multiset<> >();
 }

test/std/containers/set_allocator_requirement_test_templates.h

@@ -344,11 +344,54 @@ void testMultisetInsert()
   {
     CHECKPOINT("Testing C::insert(Iter, Iter) for *Iter = value_type&");
     Container c;
-    ValueTp ValueList[] = { ValueTp(1), ValueTp(2) , ValueTp(3) };
+    ValueTp ValueList[] = { ValueTp(1), ValueTp(2) , ValueTp(1) };
     cc->expect<ValueTp&>(3);
     c.insert(std::begin(ValueList), std::end(ValueList));
     assert(!cc->unchecked());
   }
 }
 
+
+template <class Container>
+void testMultisetEmplace()
+{
+  typedef typename Container::value_type ValueTp;
+  typedef Container C;
+  typedef std::pair<typename C::iterator, bool> R;
+  ConstructController* cc = getConstructController();
+  cc->reset();
+  {
+    CHECKPOINT("Testing C::emplace(const value_type&)");
+    Container c;
+    const ValueTp v(42);
+    cc->expect<const ValueTp&>();
+    c.emplace(v);
+    assert(!cc->unchecked());
+  }
+  {
+    CHECKPOINT("Testing C::emplace(value_type&)");
+    Container c;
+    ValueTp v(42);
+    cc->expect<ValueTp&>();
+    c.emplace(v);
+    assert(!cc->unchecked());
+  }
+  {
+    CHECKPOINT("Testing C::emplace(value_type&&)");
+    Container c;
+    ValueTp v(42);
+    cc->expect<ValueTp&&>();
+    c.emplace(std::move(v));
+    assert(!cc->unchecked());
+  }
+  {
+    CHECKPOINT("Testing C::emplace(const value_type&&)");
+    Container c;
+    const ValueTp v(42);
+    cc->expect<const ValueTp&&>();
+    c.emplace(std::move(v));
+    assert(!cc->unchecked());
+  }
+}
+
 #endif

test/std/containers/unord/unord.multiset/insert_emplace_allocator_requirements.pass.cpp

@@ -22,4 +22,5 @@
 int main()
 {
   testMultisetInsert<TCT::unordered_multiset<> >();
+  testMultisetEmplace<TCT::unordered_multiset<> >();
 }