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ext-boost/boost/mp11/detail/mp_with_index.hpp

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#ifndef BOOST_MP11_DETAIL_MP_WITH_INDEX_HPP_INCLUDED
#define BOOST_MP11_DETAIL_MP_WITH_INDEX_HPP_INCLUDED
// Copyright 2017 Peter Dimov.
//
// 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
#include <boost/mp11/integral.hpp>
#include <boost/mp11/detail/config.hpp>
#include <type_traits>
#include <utility>
#include <cassert>
#if defined( BOOST_MP11_HAS_CXX14_CONSTEXPR )
# define BOOST_MP11_CONSTEXPR14 constexpr
#else
# define BOOST_MP11_CONSTEXPR14
#endif
#if defined( _MSC_VER ) && !defined( __clang__ )
# define BOOST_MP11_UNREACHABLE() __assume(false)
#else
# define BOOST_MP11_UNREACHABLE() __builtin_unreachable()
#endif
namespace boost
{
namespace mp11
{
namespace detail
{
template<std::size_t N> struct mp_with_index_impl_
{
template<std::size_t K, class F> static BOOST_MP11_CONSTEXPR14 decltype(std::declval<F>()(std::declval<mp_size_t<0>>())) call( std::size_t i, F && f )
{
switch( i )
{
case 0: return std::forward<F>(f)( mp_size_t<K+0>() );
case 1: return std::forward<F>(f)( mp_size_t<K+1>() );
case 2: return std::forward<F>(f)( mp_size_t<K+2>() );
case 3: return std::forward<F>(f)( mp_size_t<K+3>() );
case 4: return std::forward<F>(f)( mp_size_t<K+4>() );
case 5: return std::forward<F>(f)( mp_size_t<K+5>() );
case 6: return std::forward<F>(f)( mp_size_t<K+6>() );
case 7: return std::forward<F>(f)( mp_size_t<K+7>() );
case 8: return std::forward<F>(f)( mp_size_t<K+8>() );
case 9: return std::forward<F>(f)( mp_size_t<K+9>() );
case 10: return std::forward<F>(f)( mp_size_t<K+10>() );
case 11: return std::forward<F>(f)( mp_size_t<K+11>() );
case 12: return std::forward<F>(f)( mp_size_t<K+12>() );
case 13: return std::forward<F>(f)( mp_size_t<K+13>() );
case 14: return std::forward<F>(f)( mp_size_t<K+14>() );
case 15: return std::forward<F>(f)( mp_size_t<K+15>() );
}
return mp_with_index_impl_<N-16>::template call<K+16>( i-16, std::forward<F>(f) );
}
};
template<> struct mp_with_index_impl_<0>
{
};
template<> struct mp_with_index_impl_<1>
{
template<std::size_t K, class F> static BOOST_MP11_CONSTEXPR14 decltype(std::declval<F>()(std::declval<mp_size_t<0>>())) call( std::size_t /*i*/, F && f )
{
return std::forward<F>(f)( mp_size_t<K+0>() );
}
};
template<> struct mp_with_index_impl_<2>
{
template<std::size_t K, class F> static BOOST_MP11_CONSTEXPR14 decltype(std::declval<F>()(std::declval<mp_size_t<0>>())) call( std::size_t i, F && f )
{
switch( i )
{
default: BOOST_MP11_UNREACHABLE();
case 0: return std::forward<F>(f)( mp_size_t<K+0>() );
case 1: return std::forward<F>(f)( mp_size_t<K+1>() );
}
}
};
template<> struct mp_with_index_impl_<3>
{
template<std::size_t K, class F> static BOOST_MP11_CONSTEXPR14 decltype(std::declval<F>()(std::declval<mp_size_t<0>>())) call( std::size_t i, F && f )
{
switch( i )
{
default: BOOST_MP11_UNREACHABLE();
case 0: return std::forward<F>(f)( mp_size_t<K+0>() );
case 1: return std::forward<F>(f)( mp_size_t<K+1>() );
case 2: return std::forward<F>(f)( mp_size_t<K+2>() );
}
}
};
template<> struct mp_with_index_impl_<4>
{
template<std::size_t K, class F> static BOOST_MP11_CONSTEXPR14 decltype(std::declval<F>()(std::declval<mp_size_t<0>>())) call( std::size_t i, F && f )
{
switch( i )
{
default: BOOST_MP11_UNREACHABLE();
case 0: return std::forward<F>(f)( mp_size_t<K+0>() );
case 1: return std::forward<F>(f)( mp_size_t<K+1>() );
case 2: return std::forward<F>(f)( mp_size_t<K+2>() );
case 3: return std::forward<F>(f)( mp_size_t<K+3>() );
}
}
};
template<> struct mp_with_index_impl_<5>
{
template<std::size_t K, class F> static BOOST_MP11_CONSTEXPR14 decltype(std::declval<F>()(std::declval<mp_size_t<0>>())) call( std::size_t i, F && f )
{
switch( i )
{
default: BOOST_MP11_UNREACHABLE();
case 0: return std::forward<F>(f)( mp_size_t<K+0>() );
case 1: return std::forward<F>(f)( mp_size_t<K+1>() );
case 2: return std::forward<F>(f)( mp_size_t<K+2>() );
case 3: return std::forward<F>(f)( mp_size_t<K+3>() );
case 4: return std::forward<F>(f)( mp_size_t<K+4>() );
}
}
};
template<> struct mp_with_index_impl_<6>
{
template<std::size_t K, class F> static BOOST_MP11_CONSTEXPR14 decltype(std::declval<F>()(std::declval<mp_size_t<0>>())) call( std::size_t i, F && f )
{
switch( i )
{
default: BOOST_MP11_UNREACHABLE();
case 0: return std::forward<F>(f)( mp_size_t<K+0>() );
case 1: return std::forward<F>(f)( mp_size_t<K+1>() );
case 2: return std::forward<F>(f)( mp_size_t<K+2>() );
case 3: return std::forward<F>(f)( mp_size_t<K+3>() );
case 4: return std::forward<F>(f)( mp_size_t<K+4>() );
case 5: return std::forward<F>(f)( mp_size_t<K+5>() );
}
}
};
template<> struct mp_with_index_impl_<7>
{
template<std::size_t K, class F> static BOOST_MP11_CONSTEXPR14 decltype(std::declval<F>()(std::declval<mp_size_t<0>>())) call( std::size_t i, F && f )
{
switch( i )
{
default: BOOST_MP11_UNREACHABLE();
case 0: return std::forward<F>(f)( mp_size_t<K+0>() );
case 1: return std::forward<F>(f)( mp_size_t<K+1>() );
case 2: return std::forward<F>(f)( mp_size_t<K+2>() );
case 3: return std::forward<F>(f)( mp_size_t<K+3>() );
case 4: return std::forward<F>(f)( mp_size_t<K+4>() );
case 5: return std::forward<F>(f)( mp_size_t<K+5>() );
case 6: return std::forward<F>(f)( mp_size_t<K+6>() );
}
}
};
template<> struct mp_with_index_impl_<8>
{
template<std::size_t K, class F> static BOOST_MP11_CONSTEXPR14 decltype(std::declval<F>()(std::declval<mp_size_t<0>>())) call( std::size_t i, F && f )
{
switch( i )
{
default: BOOST_MP11_UNREACHABLE();
case 0: return std::forward<F>(f)( mp_size_t<K+0>() );
case 1: return std::forward<F>(f)( mp_size_t<K+1>() );
case 2: return std::forward<F>(f)( mp_size_t<K+2>() );
case 3: return std::forward<F>(f)( mp_size_t<K+3>() );
case 4: return std::forward<F>(f)( mp_size_t<K+4>() );
case 5: return std::forward<F>(f)( mp_size_t<K+5>() );
case 6: return std::forward<F>(f)( mp_size_t<K+6>() );
case 7: return std::forward<F>(f)( mp_size_t<K+7>() );
}
}
};
template<> struct mp_with_index_impl_<9>
{
template<std::size_t K, class F> static BOOST_MP11_CONSTEXPR14 decltype(std::declval<F>()(std::declval<mp_size_t<0>>())) call( std::size_t i, F && f )
{
switch( i )
{
default: BOOST_MP11_UNREACHABLE();
case 0: return std::forward<F>(f)( mp_size_t<K+0>() );
case 1: return std::forward<F>(f)( mp_size_t<K+1>() );
case 2: return std::forward<F>(f)( mp_size_t<K+2>() );
case 3: return std::forward<F>(f)( mp_size_t<K+3>() );
case 4: return std::forward<F>(f)( mp_size_t<K+4>() );
case 5: return std::forward<F>(f)( mp_size_t<K+5>() );
case 6: return std::forward<F>(f)( mp_size_t<K+6>() );
case 7: return std::forward<F>(f)( mp_size_t<K+7>() );
case 8: return std::forward<F>(f)( mp_size_t<K+8>() );
}
}
};
template<> struct mp_with_index_impl_<10>
{
template<std::size_t K, class F> static BOOST_MP11_CONSTEXPR14 decltype(std::declval<F>()(std::declval<mp_size_t<0>>())) call( std::size_t i, F && f )
{
switch( i )
{
default: BOOST_MP11_UNREACHABLE();
case 0: return std::forward<F>(f)( mp_size_t<K+0>() );
case 1: return std::forward<F>(f)( mp_size_t<K+1>() );
case 2: return std::forward<F>(f)( mp_size_t<K+2>() );
case 3: return std::forward<F>(f)( mp_size_t<K+3>() );
case 4: return std::forward<F>(f)( mp_size_t<K+4>() );
case 5: return std::forward<F>(f)( mp_size_t<K+5>() );
case 6: return std::forward<F>(f)( mp_size_t<K+6>() );
case 7: return std::forward<F>(f)( mp_size_t<K+7>() );
case 8: return std::forward<F>(f)( mp_size_t<K+8>() );
case 9: return std::forward<F>(f)( mp_size_t<K+9>() );
}
}
};
template<> struct mp_with_index_impl_<11>
{
template<std::size_t K, class F> static BOOST_MP11_CONSTEXPR14 decltype(std::declval<F>()(std::declval<mp_size_t<0>>())) call( std::size_t i, F && f )
{
switch( i )
{
default: BOOST_MP11_UNREACHABLE();
case 0: return std::forward<F>(f)( mp_size_t<K+0>() );
case 1: return std::forward<F>(f)( mp_size_t<K+1>() );
case 2: return std::forward<F>(f)( mp_size_t<K+2>() );
case 3: return std::forward<F>(f)( mp_size_t<K+3>() );
case 4: return std::forward<F>(f)( mp_size_t<K+4>() );
case 5: return std::forward<F>(f)( mp_size_t<K+5>() );
case 6: return std::forward<F>(f)( mp_size_t<K+6>() );
case 7: return std::forward<F>(f)( mp_size_t<K+7>() );
case 8: return std::forward<F>(f)( mp_size_t<K+8>() );
case 9: return std::forward<F>(f)( mp_size_t<K+9>() );
case 10: return std::forward<F>(f)( mp_size_t<K+10>() );
}
}
};
template<> struct mp_with_index_impl_<12>
{
template<std::size_t K, class F> static BOOST_MP11_CONSTEXPR14 decltype(std::declval<F>()(std::declval<mp_size_t<0>>())) call( std::size_t i, F && f )
{
switch( i )
{
default: BOOST_MP11_UNREACHABLE();
case 0: return std::forward<F>(f)( mp_size_t<K+0>() );
case 1: return std::forward<F>(f)( mp_size_t<K+1>() );
case 2: return std::forward<F>(f)( mp_size_t<K+2>() );
case 3: return std::forward<F>(f)( mp_size_t<K+3>() );
case 4: return std::forward<F>(f)( mp_size_t<K+4>() );
case 5: return std::forward<F>(f)( mp_size_t<K+5>() );
case 6: return std::forward<F>(f)( mp_size_t<K+6>() );
case 7: return std::forward<F>(f)( mp_size_t<K+7>() );
case 8: return std::forward<F>(f)( mp_size_t<K+8>() );
case 9: return std::forward<F>(f)( mp_size_t<K+9>() );
case 10: return std::forward<F>(f)( mp_size_t<K+10>() );
case 11: return std::forward<F>(f)( mp_size_t<K+11>() );
}
}
};
template<> struct mp_with_index_impl_<13>
{
template<std::size_t K, class F> static BOOST_MP11_CONSTEXPR14 decltype(std::declval<F>()(std::declval<mp_size_t<0>>())) call( std::size_t i, F && f )
{
switch( i )
{
default: BOOST_MP11_UNREACHABLE();
case 0: return std::forward<F>(f)( mp_size_t<K+0>() );
case 1: return std::forward<F>(f)( mp_size_t<K+1>() );
case 2: return std::forward<F>(f)( mp_size_t<K+2>() );
case 3: return std::forward<F>(f)( mp_size_t<K+3>() );
case 4: return std::forward<F>(f)( mp_size_t<K+4>() );
case 5: return std::forward<F>(f)( mp_size_t<K+5>() );
case 6: return std::forward<F>(f)( mp_size_t<K+6>() );
case 7: return std::forward<F>(f)( mp_size_t<K+7>() );
case 8: return std::forward<F>(f)( mp_size_t<K+8>() );
case 9: return std::forward<F>(f)( mp_size_t<K+9>() );
case 10: return std::forward<F>(f)( mp_size_t<K+10>() );
case 11: return std::forward<F>(f)( mp_size_t<K+11>() );
case 12: return std::forward<F>(f)( mp_size_t<K+12>() );
}
}
};
template<> struct mp_with_index_impl_<14>
{
template<std::size_t K, class F> static BOOST_MP11_CONSTEXPR14 decltype(std::declval<F>()(std::declval<mp_size_t<0>>())) call( std::size_t i, F && f )
{
switch( i )
{
default: BOOST_MP11_UNREACHABLE();
case 0: return std::forward<F>(f)( mp_size_t<K+0>() );
case 1: return std::forward<F>(f)( mp_size_t<K+1>() );
case 2: return std::forward<F>(f)( mp_size_t<K+2>() );
case 3: return std::forward<F>(f)( mp_size_t<K+3>() );
case 4: return std::forward<F>(f)( mp_size_t<K+4>() );
case 5: return std::forward<F>(f)( mp_size_t<K+5>() );
case 6: return std::forward<F>(f)( mp_size_t<K+6>() );
case 7: return std::forward<F>(f)( mp_size_t<K+7>() );
case 8: return std::forward<F>(f)( mp_size_t<K+8>() );
case 9: return std::forward<F>(f)( mp_size_t<K+9>() );
case 10: return std::forward<F>(f)( mp_size_t<K+10>() );
case 11: return std::forward<F>(f)( mp_size_t<K+11>() );
case 12: return std::forward<F>(f)( mp_size_t<K+12>() );
case 13: return std::forward<F>(f)( mp_size_t<K+13>() );
}
}
};
template<> struct mp_with_index_impl_<15>
{
template<std::size_t K, class F> static BOOST_MP11_CONSTEXPR14 decltype(std::declval<F>()(std::declval<mp_size_t<0>>())) call( std::size_t i, F && f )
{
switch( i )
{
default: BOOST_MP11_UNREACHABLE();
case 0: return std::forward<F>(f)( mp_size_t<K+0>() );
case 1: return std::forward<F>(f)( mp_size_t<K+1>() );
case 2: return std::forward<F>(f)( mp_size_t<K+2>() );
case 3: return std::forward<F>(f)( mp_size_t<K+3>() );
case 4: return std::forward<F>(f)( mp_size_t<K+4>() );
case 5: return std::forward<F>(f)( mp_size_t<K+5>() );
case 6: return std::forward<F>(f)( mp_size_t<K+6>() );
case 7: return std::forward<F>(f)( mp_size_t<K+7>() );
case 8: return std::forward<F>(f)( mp_size_t<K+8>() );
case 9: return std::forward<F>(f)( mp_size_t<K+9>() );
case 10: return std::forward<F>(f)( mp_size_t<K+10>() );
case 11: return std::forward<F>(f)( mp_size_t<K+11>() );
case 12: return std::forward<F>(f)( mp_size_t<K+12>() );
case 13: return std::forward<F>(f)( mp_size_t<K+13>() );
case 14: return std::forward<F>(f)( mp_size_t<K+14>() );
}
}
};
template<> struct mp_with_index_impl_<16>
{
template<std::size_t K, class F> static BOOST_MP11_CONSTEXPR14 decltype(std::declval<F>()(std::declval<mp_size_t<0>>())) call( std::size_t i, F && f )
{
switch( i )
{
default: BOOST_MP11_UNREACHABLE();
case 0: return std::forward<F>(f)( mp_size_t<K+0>() );
case 1: return std::forward<F>(f)( mp_size_t<K+1>() );
case 2: return std::forward<F>(f)( mp_size_t<K+2>() );
case 3: return std::forward<F>(f)( mp_size_t<K+3>() );
case 4: return std::forward<F>(f)( mp_size_t<K+4>() );
case 5: return std::forward<F>(f)( mp_size_t<K+5>() );
case 6: return std::forward<F>(f)( mp_size_t<K+6>() );
case 7: return std::forward<F>(f)( mp_size_t<K+7>() );
case 8: return std::forward<F>(f)( mp_size_t<K+8>() );
case 9: return std::forward<F>(f)( mp_size_t<K+9>() );
case 10: return std::forward<F>(f)( mp_size_t<K+10>() );
case 11: return std::forward<F>(f)( mp_size_t<K+11>() );
case 12: return std::forward<F>(f)( mp_size_t<K+12>() );
case 13: return std::forward<F>(f)( mp_size_t<K+13>() );
case 14: return std::forward<F>(f)( mp_size_t<K+14>() );
case 15: return std::forward<F>(f)( mp_size_t<K+15>() );
}
}
};
} // namespace detail
template<std::size_t N, class F> inline BOOST_MP11_CONSTEXPR14 decltype(std::declval<F>()(std::declval<mp_size_t<0>>())) mp_with_index( std::size_t i, F && f )
{
assert( i < N );
return detail::mp_with_index_impl_<N>::template call<0>( i, std::forward<F>(f) );
}
template<class N, class F> inline BOOST_MP11_CONSTEXPR14 decltype(std::declval<F>()(std::declval<mp_size_t<0>>())) mp_with_index( std::size_t i, F && f )
{
return mp_with_index<std::size_t{N::value}>( i, std::forward<F>(f) );
}
#undef BOOST_MP11_CONSTEXPR14
#undef BOOST_MP11_UNREACHABLE
} // namespace mp11
} // namespace boost
#endif // #ifndef BOOST_MP11_DETAIL_MP_WITH_INDEX_HPP_INCLUDED
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