42 lines
1.1 KiB
C++
42 lines
1.1 KiB
C++
// Copyright 2017 Peter Dimov.
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// Distributed under the Boost Software License, Version 1.0.
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// https://www.boost.org/LICENSE_1_0.txt
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#ifndef BOOST_HASH_IS_RANGE_HPP_INCLUDED
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#define BOOST_HASH_IS_RANGE_HPP_INCLUDED
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#include <iterator>
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#include <type_traits>
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namespace boost
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{
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namespace hash_detail
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{
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template<class T> struct iterator_traits: std::iterator_traits<T> {};
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template<> struct iterator_traits< void* > {};
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template<> struct iterator_traits< void const* > {};
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template<class T, class It>
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std::integral_constant< bool, !std::is_same<typename std::remove_cv<T>::type, typename iterator_traits<It>::value_type>::value >
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is_range_check( It first, It last );
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template<class T> decltype( is_range_check<T>( std::declval<T const&>().begin(), std::declval<T const&>().end() ) ) is_range_( int );
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template<class T> std::false_type is_range_( ... );
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} // namespace hash_detail
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namespace container_hash
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{
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template<class T> struct is_range: decltype( hash_detail::is_range_<T>( 0 ) )
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{
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};
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} // namespace container_hash
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} // namespace boost
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#endif // #ifndef BOOST_HASH_IS_RANGE_HPP_INCLUDED
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