mfbt/NullPtr.h
author Olli Pettay <Olli.Pettay@helsinki.fi>
Wed, 08 Apr 2015 18:30:03 +0300
changeset 238181 55524bdeb708cca0f7b128fbe3e1e58cbece899d
parent 223782 e5fee301e66cfa4051d3a57999bbd13571f1f44c
child 252629 91d6e262b662a0b4e47358665e222d3927337af9
permissions -rw-r--r--
Bug 936092, initial DnD support for e10s, r=enndeakin,karlt

/* -*- 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 {};

}

#endif /* mozilla_NullPtr_h */