factorial.h

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/******************************************************************************
 * Copyright 2017 The Apollo Authors. All Rights Reserved.
 *
 * 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 <cstdint>
 
namespace apollo {
namespace common {
namespace math {
 
template <uint64_t N>
struct Factorial {
  enum { value = N * Factorial<N - 1>::value };
};
 
template <>
struct Factorial<0> {
  enum { value = 1 };
};
 
}  // namespace math
}  // namespace common
}  // namespace apollo