chromium/third_party/s2cellid/src/s2/util/math/mathutil.h

// Copyright 2001 Google Inc. 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.
//

//
// This class is intended to contain a collection of useful (static)
// mathematical functions, properly coded (by consulting numerical
// recipes or another authoritative source first).

#ifndef S2_UTIL_MATH_MATHUTIL_H_
#define S2_UTIL_MATH_MATHUTIL_H_

#include <type_traits>

class MathUtil { … };

// ========================================================================= //

#if (defined __i386__ || defined __x86_64__) && defined __GNUC__

// We define template specializations of Round() to get the more efficient
// Intel versions when possible.  Note that gcc does not currently support
// partial specialization of templatized functions.

template <>
inline int32_t MathUtil::Round<int32_t, double>(double x) { … }

template <>
inline int32_t MathUtil::Round<int32_t, float>(float x) { … }

template <>
inline int64_t MathUtil::Round<int64_t, double>(double x) { … }

template <>
inline int64_t MathUtil::Round<int64_t, float>(float x) { … }

#endif

#endif  // S2_UTIL_MATH_MATHUTIL_H_