binary_operators.h

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/*
 * Copyright 2026 MusicScience37 (Kenta Kabashima)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#pragma once
 
#include <string_view>
 
#include "func_sketch/common_types.h"
#include "func_sketch/math/common_type.h"
#include "func_sketch/math/pow_number.h"
 
namespace func_sketch::math {

class AdditionOperator {
public:
    [[nodiscard]] static std::string_view name() noexcept { return "add"; }

    static void operator()(
        const Number& left, const Number& right, Number& result) {
        std::visit(
            [&result](const auto& left_value, const auto& right_value) {
                using ResultType =
                    CommonType<decltype(left_value), decltype(right_value)>;
                result = static_cast<ResultType>(left_value) +
                    static_cast<ResultType>(right_value);
            },
            left, right);
    }
};

class SubtractionOperator {
public:
    [[nodiscard]] static std::string_view name() noexcept { return "sub"; }

    static void operator()(
        const Number& left, const Number& right, Number& result) {
        std::visit(
            [&result](const auto& left_value, const auto& right_value) {
                using ResultType =
                    CommonType<decltype(left_value), decltype(right_value)>;
                result = static_cast<ResultType>(left_value) -
                    static_cast<ResultType>(right_value);
            },
            left, right);
    }
};

class MultiplicationOperator {
public:
    [[nodiscard]] static std::string_view name() noexcept { return "mul"; }

    static void operator()(
        const Number& left, const Number& right, Number& result) {
        std::visit(
            [&result](const auto& left_value, const auto& right_value) {
                using ResultType =
                    CommonType<decltype(left_value), decltype(right_value)>;
                result = static_cast<ResultType>(left_value) *
                    static_cast<ResultType>(right_value);
            },
            left, right);
    }
};

class DivisionOperator {
public:
    [[nodiscard]] static std::string_view name() noexcept { return "div"; }

    static void operator()(
        const Number& left, const Number& right, Number& result) {
        std::visit(
            [&result](const auto& left_value, const auto& right_value) {
                using ResultType =
                    CommonType<decltype(left_value), decltype(right_value)>;
                result = static_cast<ResultType>(left_value) /
                    static_cast<ResultType>(right_value);
            },
            left, right);
    }
};

class PowerOperator {
public:
    [[nodiscard]] static std::string_view name() noexcept { return "pow"; }

    static void operator()(
        const Number& left, const Number& right, Number& result) {
        std::visit(
            [&result](const auto& left_value, const auto& right_value) {
                result = pow_number(left_value, right_value);
            },
            left, right);
    }
};
 
}  // namespace func_sketch::math