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- /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
- /* vim: set ts=8 sts=2 et sw=2 tw=80: */
- /* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
- /* Implements a mozilla::IsNullPointer<T> type trait. */
- #ifndef mozilla_NullPtr_h
- #define mozilla_NullPtr_h
- #include "mozilla/TypeTraits.h"
- namespace mozilla {
- /**
- * IsNullPointer<T>::value is true iff T is decltype(nullptr).
- *
- * Ideally this would be in TypeTraits.h, but C++11 omitted std::is_null_pointer
- * (fixed in C++14), so in the interests of easing a switch to <type_traits>,
- * this trait lives elsewhere.
- */
- template<typename T>
- struct IsNullPointer : FalseType {};
- template<>
- struct IsNullPointer<decltype(nullptr)> : TrueType {};
- } // namespace mozilla
- #endif /* mozilla_NullPtr_h */
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