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