constants.h

/**************************************************************************
 * 3to4++ - https://github.com/rayzchen/3to4++
 *-------------------------------------------------------------------------
 * Copyright 2024 Ray Chen
 *
 * 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.
 *
 **************************************************************************/

#ifndef CONSTANTS_H
#define CONSTANTS_H

#ifndef M_PI
#if __has_cpp_attribute(__cpp_lib_math_constants)
#define M_PI std::numbers::pi
#define M_PI_2 std::numbers::pi / 2
#define M_PI_4 std::numbers::pi / 4
#else
#define M_PI 3.14159265358979323846
#define M_PI_2 1.57079632679489661923
#define M_PI_4 0.785398163397448309616
#endif
#endif

#endif // constants.h