boost/multiprecision/traits/is_byte_container.hpp
/////////////////////////////////////////////////////////////////////////////// // Copyright 2015 John Maddock. Distributed under the Boost // Software License, Version 1.0. (See accompanying file // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) #ifndef BOOST_IS_BYTE_CONTAINER_HPP #define BOOST_IS_BYTE_CONTAINER_HPP #include <iterator> #include <type_traits> namespace boost { namespace multiprecision { namespace detail { template <class T> struct has_member_const_iterator { template <class U> static double check(U*, typename U::const_iterator* = 0); static char check(...); static T* get(); static constexpr bool value = sizeof(check(get())) == sizeof(double); }; template <class C, bool b> struct is_byte_container_imp { // Note: Don't use C::value_type as this is a rather widespread typedef, even for non-range types using container_value_type = typename std::remove_cv<typename std::iterator_traits<typename C::const_iterator>::value_type>::type; static constexpr const bool value = boost::multiprecision::detail::is_integral<container_value_type>::value && (sizeof(container_value_type) == 1); }; template <class C> struct is_byte_container_imp<C, false> : public boost::false_type {}; template <class C> struct is_byte_container : public is_byte_container_imp<C, has_member_const_iterator<C>::value> {}; }}} // namespace boost::multiprecision::detail #endif // BOOST_IS_BYTE_CONTAINER_HPP