gamma.cpp

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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.
 */
#include "func_sketch/math/functions/gamma.h"
 
#include <boost/math/special_functions/gamma.hpp>
 
#include "func_sketch/common_types.h"
#include "func_sketch/math/acceptable_types.h"
#include "func_sketch/math/general_math_function.h"
#include "func_sketch/math/math_function.h"
 
namespace func_sketch::math {
 
MathFunction gamma_function() {
    return MathFunction(
        make_general_math_function<std::tuple<AcceptableTypes<Real>>>(
            "gamma", [](Real arg) {
                try {
                    return boost::math::tgamma(arg);
                } catch (const std::exception& e) {
                    return std::numeric_limits<Real>::quiet_NaN();
                }
            }));
}
 
MathFunction lgamma_function() {
    return MathFunction(
        make_general_math_function<std::tuple<AcceptableTypes<Real>>>(
            "lgamma", [](Real arg) {
                try {
                    return boost::math::lgamma(arg);
                } catch (const std::exception& e) {
                    return std::numeric_limits<Real>::quiet_NaN();
                }
            }));
}
 
}  // namespace func_sketch::math