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Contents
/*
*
* Copyright (c) 2002
* John Maddock
*
* Use, modification and distribution are subject to the
* Boost Software License, Version 1.0. (See accompanying file
* LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
*
*/
/*
* LOCATION: see http://www.boost.org for most recent version.
* FILE regex_match.hpp
* VERSION see <boost/version.hpp>
* DESCRIPTION: Iterator traits for selecting an iterator type as
* an integral constant expression.
*/
#ifndef BOOST_REGEX_ITERATOR_CATEGORY_HPP
#define BOOST_REGEX_ITERATOR_CATEGORY_HPP
#include <iterator>
#include <type_traits>
namespace boost{
namespace detail{
template <class I>
struct is_random_imp
{
private:
typedef typename std::iterator_traits<I>::iterator_category cat;
public:
static const bool value = (std::is_convertible<cat*, std::random_access_iterator_tag*>::value);
};
template <class I>
struct is_random_pointer_imp
{
static const bool value = true;
};
template <bool is_pointer_type>
struct is_random_imp_selector
{
template <class I>
struct rebind
{
typedef is_random_imp<I> type;
};
};
template <>
struct is_random_imp_selector<true>
{
template <class I>
struct rebind
{
typedef is_random_pointer_imp<I> type;
};
};
}
template <class I>
struct is_random_access_iterator
{
private:
typedef detail::is_random_imp_selector< std::is_pointer<I>::value> selector;
typedef typename selector::template rebind<I> bound_type;
typedef typename bound_type::type answer;
public:
static const bool value = answer::value;
};
template <class I>
const bool is_random_access_iterator<I>::value;
}
#endif
Version data entries
16 entries across 16 versions & 1 rubygems