| /* -*- 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 */ |
