esum.hpp

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#ifndef EAGINE_VECT_ESUM_HPP
#define EAGINE_VECT_ESUM_HPP
 
#include "config.hpp"
#if EAGINE_VECT_OPTS
#include "hsum.hpp"
#else
#include "data.hpp"
#endif
 
namespace eagine::vect {
 
template <typename T, int N, bool V>
struct esum {
private:
    using _dpT = data_param_t<T, N, V>;
 
    template <int U>
    using _int = int_constant<U>;
 
    template <bool B>
    using _bool = bool_constant<B>;
 
    template <int M, bool B>
    static auto _hlp(_dpT v, _int<M>, _bool<B>) noexcept -> T {
        static_assert(M == N);
        T r = T(0);
 
        for(int i = 0; i < N; ++i) {
            r += v[i];
        }
        return r;
    }
 
#if EAGINE_VECT_OPTS
    template <bool B>
    static constexpr auto _hlp(_dpT v, _int<1>, _bool<B>) noexcept -> T {
        return v[0];
    }
 
    template <int M>
    static auto _hlp(_dpT v, _int<M>, std::true_type) noexcept -> T {
        static_assert(M == N);
        return hsum<T, N, V>::apply(v)[N - 1];
    }
#endif
public:
    static auto apply(_dpT v) noexcept -> T {
        return _hlp(v, _int<N>(), has_vect_data<T, N, V>());
    }
};
 
} // namespace eagine::vect
 
#endif // EAGINE_VECT_ESUM_HPP