67 lines
1.6 KiB
Plaintext
67 lines
1.6 KiB
Plaintext
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// Boost.Range library
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//
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// Copyright Neil Groves 2014.
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//
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// Use, modification and distribution are subject to the Boost Software License,
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// Version 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_DETAIL_HAS_MEMBER_SIZE_HPP
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#define BOOST_RANGE_DETAIL_HAS_MEMBER_SIZE_HPP
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#include <boost/type_traits/is_class.hpp>
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#include <boost/type_traits/is_member_function_pointer.hpp>
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#include <boost/mpl/and.hpp>
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#include <boost/mpl/bool.hpp>
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#include <boost/cstdint.hpp>
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namespace boost
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{
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namespace range_detail
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{
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template<class T>
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class has_member_size_impl
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{
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private:
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template<class U, U>
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class check
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{
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};
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template<class C>
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static boost::uint8_t f(check<std::size_t(C::*)(void) const, &C::size>*);
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template<class C>
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static boost::uint16_t f(...);
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public:
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static const bool value =
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(sizeof(f<T>(0)) == sizeof(boost::uint8_t));
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typedef typename mpl::if_c<
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(sizeof(f<T>(0)) == sizeof(boost::uint8_t)),
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mpl::true_,
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mpl::false_
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>::type type;
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};
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template<class T>
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struct has_member_size
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{
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typedef typename mpl::and_<
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typename is_class<T>::type,
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typename has_member_size_impl<const T>::type
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>::type type;
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static const bool value =
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is_class<T>::value && has_member_size_impl<const T>::value;
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};
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} // namespace range_detail
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}// namespace boost
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#endif // include guard
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