//
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// Copyright 2012 Christian Henning, Andreas Pokorny, Lubomir Bourdev
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//
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// Distributed under the Boost Software License, Version 1.0
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// 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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#ifndef BOOST_GIL_EXTENSION_TOOLBOX_METAFUNCTIONS_GET_NUM_BITS_HPP
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#define BOOST_GIL_EXTENSION_TOOLBOX_METAFUNCTIONS_GET_NUM_BITS_HPP
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#include <boost/gil/channel.hpp>
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#include <boost/gil/detail/is_channel_integral.hpp>
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#include <boost/gil/detail/mp11.hpp>
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#include <type_traits>
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namespace boost{ namespace gil {
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/// get_num_bits metafunctions
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/// \brief Determines the numbers of bits for the given channel type.
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template <typename T, class = void>
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struct get_num_bits;
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template<typename B, int I, int S, bool M>
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struct get_num_bits<packed_channel_reference<B, I, S, M>>
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: std::integral_constant<int, S>
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{};
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template<typename B, int I, int S, bool M>
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struct get_num_bits<packed_channel_reference<B, I, S, M> const>
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: std::integral_constant<int, S>
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{};
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template<typename B, int I, bool M>
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struct get_num_bits<packed_dynamic_channel_reference<B, I, M>>
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: std::integral_constant<int, I>
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{};
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template<typename B, int I, bool M>
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struct get_num_bits<packed_dynamic_channel_reference<B, I, M> const>
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: std::integral_constant<int, I>
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{};
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template<int N>
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struct get_num_bits<packed_channel_value<N>> : std::integral_constant<int, N>
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{};
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template<int N>
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struct get_num_bits<packed_channel_value<N> const> : std::integral_constant<int, N>
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{};
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template <typename T>
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struct get_num_bits
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<
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T,
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typename std::enable_if
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<
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mp11::mp_and
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<
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detail::is_channel_integral<T>,
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mp11::mp_not<std::is_class<T>>
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>::value
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>::type
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>
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: std::integral_constant<std::size_t, sizeof(T) * 8>
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{};
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}} // namespace boost::gil
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#endif
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