Index: base/nullptr.h |
diff --git a/base/nullptr.h b/base/nullptr.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..4d563a5382d505a3dee4b303aa3b2f3eda6f7f70 |
--- /dev/null |
+++ b/base/nullptr.h |
@@ -0,0 +1,39 @@ |
+// Copyright (c) 2012 The Chromium Authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+#ifndef BASE_NULLPTR_H_ |
+#define BASE_NULLPTR_H_ |
+ |
+#include "base/base_export.h" |
+#include "build/build_config.h" |
+ |
+#if defined(NULLPTR_IS_NATIVE_TYPE) |
+#include <cstddef> |
+#endif |
+ |
+namespace base { |
+ |
+#if defined(NULLPTR_IS_NATIVE_TYPE) |
+using std::nullptr_t; |
+#elif defined(__GLIBCXX__) && __GLIBCXX__ < 20110325 |
+typedef decltype(nullptr) nullptr_t; |
+#else |
+class BASE_EXPORT nullptr_t { |
+ public: |
+ template <class T> operator T*() const { return NULL; } |
+ template <class C, class T> operator T C::*() const { return NULL; } |
+ |
+ private: |
+ void operator&() const; |
+}; |
+#endif |
+ |
+// Ideally, it would be possible to use base::nullptr across all platforms. |
+// However, nullptr is implemented as a reserved keyword in C++11, and thus, |
+// like "true" and "false", cannot be used as a name for a type. |
+extern BASE_EXPORT nullptr_t NullPtr; |
+ |
+} // namespace base |
+ |
+#endif // #define BASE_NULLPTR_H_ |