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// The Art of C++ / Sequences
// Copyright (c) 2015 Daniel Frey
#ifndef TAOCPP_SEQUENCES_INCLUDE_PARTIAL_SUM_HPP
#define TAOCPP_SEQUENCES_INCLUDE_PARTIAL_SUM_HPP
#include <cstddef>
#include <utility>
#include "make_integer_sequence.hpp"
#include "sum.hpp"
namespace tao
{
namespace seq
{
namespace impl
{
template< std::size_t, typename S, typename = make_index_sequence< S::size() > >
struct partial_sum;
template< std::size_t I, typename T, T... Ns, std::size_t... Is >
struct partial_sum< I, integer_sequence< T, Ns... >, index_sequence< Is... > >
: seq::sum< T, ( ( Is < I ) ? Ns : 0 )... >
{
static_assert( I <= sizeof...( Is ), "tao::seq::partial_sum<I, S>: I is out of range" );
};
}
template< std::size_t I, typename T, T... Ns >
struct partial_sum
: impl::partial_sum< I, integer_sequence< T, Ns... > >
{};
template< std::size_t I, typename T, T... Ns >
struct partial_sum< I, integer_sequence< T, Ns... > >
: impl::partial_sum< I, integer_sequence< T, Ns... > >
{};
}
}
#endif // TAOCPP_SEQUENCES_INCLUDE_PARTIAL_SUM_HPP
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