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0001 // Copyright 2017 Peter Dimov.
0002 // Distributed under the Boost Software License, Version 1.0.
0003 // https://www.boost.org/LICENSE_1_0.txt
0004 
0005 #ifndef BOOST_HASH_IS_RANGE_HPP_INCLUDED
0006 #define BOOST_HASH_IS_RANGE_HPP_INCLUDED
0007 
0008 #include <iterator>
0009 #include <type_traits>
0010 
0011 namespace boost
0012 {
0013 
0014 namespace hash_detail
0015 {
0016 
0017 template<class T> struct iterator_traits: std::iterator_traits<T> {};
0018 template<> struct iterator_traits< void* > {};
0019 template<> struct iterator_traits< void const* > {};
0020 
0021 template<class T, class It>
0022     std::integral_constant< bool, !std::is_same<typename std::remove_cv<T>::type, typename iterator_traits<It>::value_type>::value >
0023         is_range_check( It first, It last );
0024 
0025 template<class T> decltype( is_range_check<T>( std::declval<T const&>().begin(), std::declval<T const&>().end() ) ) is_range_( int );
0026 template<class T> std::false_type is_range_( ... );
0027 
0028 } // namespace hash_detail
0029 
0030 namespace container_hash
0031 {
0032 
0033 template<class T> struct is_range: decltype( hash_detail::is_range_<T>( 0 ) )
0034 {
0035 };
0036 
0037 } // namespace container_hash
0038 
0039 } // namespace boost
0040 
0041 #endif // #ifndef BOOST_HASH_IS_RANGE_HPP_INCLUDED