blob: 895d8dc3567ce23746e22218c231747b34ac64ef [file] [log] [blame]
// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <stddef.h>
#include <iosfwd>
#include <iterator>
#include <type_traits>
#include <utility>
#include <vector>
#include "build/build_config.h"
namespace pdfium {
template <class T> struct is_non_const_reference : std::false_type {};
template <class T> struct is_non_const_reference<T&> : std::true_type {};
template <class T> struct is_non_const_reference<const T&> : std::false_type {};
namespace internal {
// Uses expression SFINAE to detect whether using operator<< would work.
template <typename T, typename = void>
struct SupportsOstreamOperator : std::false_type {};
template <typename T>
struct SupportsOstreamOperator<T,
<< std::declval<T>()))>
: std::true_type {};
// Used to detech whether the given type is an iterator. This is normally used
// with std::enable_if to provide disambiguation for functions that take
// templatzed iterators as input.
template <typename T, typename = void>
struct is_iterator : std::false_type {};
template <typename T>
struct is_iterator<
std::void_t<typename std::iterator_traits<T>::iterator_category>>
: std::true_type {};
} // namespace internal
} // namespace pdfium