constant_list.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 <optional>
#include <string>
#include <unordered_map>
 
#include "func_sketch/common_types.h"
 
namespace func_sketch::math {

class ConstantList {
public:
    ConstantList() = default;

    void emplace(const std::string& name, Number value) {
        constants_.emplace(name, value);
    }

    [[nodiscard]] std::optional<Number> get(const std::string& name) const {
        const auto iter = constants_.find(name);
        if (iter == constants_.end()) {
            return std::nullopt;
        }
        return iter->second;
    }
 
private:
    std::unordered_map<std::string, Number> constants_;
};

[[nodiscard]] ConstantList generate_constant_list();
 
}  // namespace func_sketch::math