112 lines
2.5 KiB
Plaintext
112 lines
2.5 KiB
Plaintext
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///////////////////////////////////////////////////////////////////////////////
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/// \file integral_c.hpp
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/// Contains definition of the integral_c transform and friends.
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//
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// Copyright 2011 Eric Niebler. 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_PROTO_TRANSFORM_INTEGRAL_C_HPP_EAN_04_28_2011
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#define BOOST_PROTO_TRANSFORM_INTEGRAL_C_HPP_EAN_04_28_2011
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#include <boost/proto/proto_fwd.hpp>
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#include <boost/proto/transform/impl.hpp>
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namespace boost { namespace proto
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{
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/// \brief A PrimitiveTransform that returns a specified
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/// integral constant
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///
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template<typename T, T I>
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struct integral_c : transform<integral_c<T, I> >
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{
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template<typename Expr, typename State, typename Data>
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struct impl : transform_impl<Expr, State, Data>
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{
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typedef T result_type;
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/// \return \c I
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/// \throw nothrow
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T operator()(
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typename impl::expr_param
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, typename impl::state_param
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, typename impl::data_param
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) const
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{
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return I;
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}
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};
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};
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/// \brief A PrimitiveTransform that returns a specified
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/// char
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///
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template<char I>
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struct char_
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: integral_c<char, I>
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{};
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/// \brief A PrimitiveTransform that returns a specified
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/// int
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///
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template<int I>
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struct int_
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: integral_c<int, I>
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{};
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/// \brief A PrimitiveTransform that returns a specified
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/// long
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///
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template<long I>
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struct long_
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: integral_c<long, I>
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{};
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/// \brief A PrimitiveTransform that returns a specified
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/// std::size_t
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///
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template<std::size_t I>
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struct size_t
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: integral_c<std::size_t, I>
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{};
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/// INTERNAL ONLY
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///
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template<typename T, T I>
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struct is_callable<integral_c<T, I> >
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: mpl::true_
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{};
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/// INTERNAL ONLY
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///
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template<char I>
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struct is_callable<char_<I> >
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: mpl::true_
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{};
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/// INTERNAL ONLY
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///
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template<int I>
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struct is_callable<int_<I> >
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: mpl::true_
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{};
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/// INTERNAL ONLY
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///
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template<long I>
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struct is_callable<long_<I> >
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: mpl::true_
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{};
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/// INTERNAL ONLY
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///
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template<std::size_t I>
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struct is_callable<size_t<I> >
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: mpl::true_
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{};
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}}
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#endif
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