52 lines
1.6 KiB
C++
52 lines
1.6 KiB
C++
///////////////////////////////////////////////////////////////////////////////
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// Copyright 2015 John Maddock. Distributed under the Boost
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// 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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#ifndef BOOST_IS_BYTE_CONTAINER_HPP
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#define BOOST_IS_BYTE_CONTAINER_HPP
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#include <iterator>
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#include <type_traits>
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namespace boost { namespace multiprecision { namespace detail {
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template <class T>
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struct has_member_const_iterator
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{
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template <class U>
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static double check(U*, typename U::const_iterator* = nullptr);
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static char check(...);
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static T* get();
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static constexpr bool value = sizeof(check(get())) == sizeof(double);
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};
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template <class C, class Iterator>
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struct is_byte_container_imp_2
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{
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using container_value_type = typename std::remove_cv<typename std::iterator_traits<typename C::const_iterator>::value_type>::type;
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static constexpr bool value = boost::multiprecision::detail::is_integral<container_value_type>::value && (sizeof(container_value_type) == 1);
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};
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template <class C>
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struct is_byte_container_imp_2<C, void> : public std::false_type
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{};
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template <class C, bool b>
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struct is_byte_container_imp : public is_byte_container_imp_2<C, typename C::const_iterator>
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{
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};
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template <class C>
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struct is_byte_container_imp<C, false> : public std::false_type
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{};
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template <class C>
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struct is_byte_container : public is_byte_container_imp<C, has_member_const_iterator<C>::value>
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{};
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}}} // namespace boost::multiprecision::detail
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#endif // BOOST_IS_BYTE_CONTAINER_HPP
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