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