Implement n3656 - make_unique. Thanks to Howard for the review and suggestions.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@185352 91177308-0d34-0410-b5e6-96231b3b80d8

test/utilities/memory/unique.ptr/unique.ptr.create/make_unique.array.pass.cpp

@@ -0,0 +1,45 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include <memory>
+#include <string>
+#include <cassert>
+
+//    The only way to create an unique_ptr<T[]> is to default construct them.
+
+class foo {
+public:
+    foo () : val_(3) {}
+    int get () const { return val_; }
+private:
+    int val_;
+    };
+
+int main()
+{
+#if _LIBCPP_STD_VER > 11
+    {
+    auto p1 = std::make_unique<int[]>(5);
+    for ( int i = 0; i < 5; ++i )
+        assert ( p1[i] == 0 );
+    }
+    
+    {
+    auto p2 = std::make_unique<std::string[]>(5);
+    for ( int i = 0; i < 5; ++i )
+        assert ( p2[i].size () == 0 );
+    }
+    
+    {
+    auto p3 = std::make_unique<foo[]>(7);
+    for ( int i = 0; i < 7; ++i )
+        assert ( p3[i].get () == 3 );
+    }
+#endif  // _LIBCPP_STD_VER > 11
+}