goldberg_emulator/overlay_experimental/System/ConstExpressions.hpp

/*
 * Copyright (C) Nemirtingas
 * This file is part of System.
 *
 * System is free software; you can redistribute it
 * and/or modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * System is distributed in the hope that it will be
 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with System; if not, see
 * <http://www.gnu.org/licenses/>.
 */

#pragma once

#include <cstddef> // size_t

namespace System {
namespace ConstExpr {
    template<typename T, size_t N>
    constexpr size_t CountOf(T(&)[N])
    {
        return N;
    }

    template<typename T, size_t N>
    constexpr size_t StrLen(T(&)[N])
    {
        return N-1;
    }

    // Sum of all parameter pack sizeof
    template <typename... Ts>
    constexpr size_t size_of = 0;

    template <typename T, typename... Ts>
    constexpr size_t size_of<T, Ts...> = sizeof(T) + size_of<Ts...>;
}
}