added implementation for make_unique

lib/Basics/Common.h

@@ -159,6 +159,7 @@ typedef long suseconds_t;
 #include "Basics/voc-errors.h"
 #include "Basics/error.h"
 #include "Basics/debugging.h"
+#include "Basics/make_unique.h"
 #include "Basics/memory.h"
 #include "Basics/mimetypes.h"
 #include "Basics/structures.h"

lib/Basics/make_unique.h

@@ -0,0 +1,87 @@
+////////////////////////////////////////////////////////////////////////////////
+/// @brief High-Performance Database Framework made by triagens
+///
+/// @file
+///
+/// DISCLAIMER
+///
+/// Copyright 2014 ArangoDB GmbH, Cologne, Germany
+/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
+///
+/// Licensed under the Apache License, Version 2.0 (the "License");
+/// you may not use this file except in compliance with the License.
+/// You may obtain a copy of the License at
+///
+///     http://www.apache.org/licenses/LICENSE-2.0
+///
+/// Unless required by applicable law or agreed to in writing, software
+/// distributed under the License is distributed on an "AS IS" BASIS,
+/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+/// See the License for the specific language governing permissions and
+/// limitations under the License.
+///
+/// Copyright holder is ArangoDB GmbH, Cologne, Germany
+///
+/// @author Dr. Frank Celler
+/// @author Copyright 2014, ArangoDB GmbH, Cologne, Germany
+/// @author Copyright 2009-2013, triAGENS GmbH, Cologne, Germany
+////////////////////////////////////////////////////////////////////////////////
+
+#ifndef ARANGODB_BASICS_MAKE_UNIQUE_H
+#define ARANGODB_BASICS_MAKE_UNIQUE_H 1
+
+#include <cstddef>
+#include <memory>
+#include <type_traits>
+#include <utility>
+
+// VS 2013 and VS 2015 already provide std::make_unique
+#ifndef _WIN32
+
+// c++98: 199711 (not supported)
+// c++11: 201103 (no std::make_unique)
+// c++14: 201402 (std::make_unique included)
+
+#if __cplusplus == 201103L
+
+////////////////////////////////////////////////////////////////////////////////
+/// Provide a make_unique() function for C++11 too
+/// http://stackoverflow.com/questions/17902405/how-to-implement-make-unique-function-in-c11
+////////////////////////////////////////////////////////////////////////////////
+
+namespace std {
+  template<class T> struct _Unique_if {
+    typedef unique_ptr<T> _Single_object;
+  };
+
+  template<class T> struct _Unique_if<T[]> {
+    typedef unique_ptr<T[]> _Unknown_bound;
+  };
+
+  template<class T, size_t N> struct _Unique_if<T[N]> {
+    typedef void _Known_bound;
+  };
+
+  template<class T, class... Args>
+    typename _Unique_if<T>::_Single_object
+    make_unique(Args&&... args) {
+      return unique_ptr<T>(new T(std::forward<Args>(args)...));
+    }
+
+  template<class T>
+    typename _Unique_if<T>::_Unknown_bound
+    make_unique(size_t n) {
+      typedef typename remove_extent<T>::type U;
+      return unique_ptr<T>(new U[n]());
+    }
+
+  template<class T, class... Args>
+    typename _Unique_if<T>::_Known_bound
+    make_unique(Args&&...) = delete;
+}
+
+#endif
+
+#endif
+
+#endif