gecko-dev/mfbt/IteratorTraits.h
Xidorn Quan 01744b79e2 Bug 1127044 part 1 - Add IteratorTraits facility. r=waldo
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extra : source : 797a32d645cb962281bf5c7cb2710e6a4122c945
2015-02-04 19:07:32 +11:00

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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/. */
/* Iterator traits to expose a value type and a difference type */
#ifndef mozilla_IteratorTraits_h
#define mozilla_IteratorTraits_h
#include <stddef.h>
namespace mozilla {
template<typename Iterator>
struct IteratorTraits
{
typedef typename Iterator::ValueType ValueType;
typedef typename Iterator::DifferenceType DifferenceType;
};
template<typename T>
struct IteratorTraits<T*>
{
typedef T ValueType;
typedef ptrdiff_t DifferenceType;
};
template<typename T>
struct IteratorTraits<const T*>
{
typedef const T ValueType;
typedef ptrdiff_t DifferenceType;
};
} // namespace mozilla
#endif // mozilla_IteratorTraits_h