91 lines
2.3 KiB
Plaintext
91 lines
2.3 KiB
Plaintext
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// Boost.Range library
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//
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// Copyright Thorsten Ottosen 2003-2004. Use, modification and
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// distribution is subject to the Boost Software License, Version
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// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// For more information, see http://www.boost.org/libs/range/
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//
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#ifndef BOOST_RANGE_SIZE_TYPE_HPP
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#define BOOST_RANGE_SIZE_TYPE_HPP
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#if defined(_MSC_VER)
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# pragma once
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#endif
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#include <boost/range/config.hpp>
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#include <boost/range/difference_type.hpp>
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#include <boost/range/concepts.hpp>
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#include <boost/range/has_range_iterator.hpp>
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#include <boost/utility/enable_if.hpp>
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#include <boost/type_traits/make_unsigned.hpp>
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#include <boost/type_traits/remove_const.hpp>
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#include <cstddef>
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#include <utility>
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namespace boost
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{
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namespace detail
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{
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//////////////////////////////////////////////////////////////////////////
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// default
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//////////////////////////////////////////////////////////////////////////
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template<typename T>
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class has_size_type
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{
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typedef char no_type;
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struct yes_type { char dummy[2]; };
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template<typename C>
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static yes_type test(BOOST_DEDUCED_TYPENAME C::size_type x);
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template<typename C>
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static no_type test(...);
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public:
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static const bool value = sizeof(test<T>(0)) == sizeof(yes_type);
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};
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template<typename C, typename Enabler=void>
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struct range_size_
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{
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typedef BOOST_DEDUCED_TYPENAME make_unsigned<
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BOOST_DEDUCED_TYPENAME range_difference<C>::type
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>::type type;
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};
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template<typename C>
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struct range_size_<
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C,
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BOOST_DEDUCED_TYPENAME ::boost::enable_if<has_size_type<C>, void>::type
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>
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{
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typedef BOOST_DEDUCED_TYPENAME C::size_type type;
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};
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template<typename C, bool B = range_detail::has_type< range_iterator<C> >::value>
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struct range_size
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{ };
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template<typename C>
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struct range_size<C, true>
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: range_size_<C>
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{ };
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}
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template< class T >
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struct range_size :
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detail::range_size<T>
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{ };
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} // namespace boost
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#endif
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