chromium/third_party/protobuf/src/google/protobuf/stubs/mathutil.h

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#ifndef GOOGLE_PROTOBUF_STUBS_MATHUTIL_H_
#define GOOGLE_PROTOBUF_STUBS_MATHUTIL_H_

#include <cmath>
#include <float.h>
#include <limits>

#include <google/protobuf/stubs/common.h>
#include <google/protobuf/stubs/logging.h>

namespace google {
namespace protobuf {
namespace internal {

// Like std::make_unsigned_t except floating point types map to themselves.
MakeUnsignedT;

// Like std::isnan() except a template function that is defined for all numeric
// types.
template <typename T,
          typename std::enable_if<std::is_integral<T>::value, int>::type = 0>
bool IsNan(T /*val*/) { … }

template <typename T, typename std::enable_if<std::is_floating_point<T>::value,
                                              int>::type = 0>
bool IsNan(T val) { … }

template<typename T>
bool AlmostEquals(T a, T b) { … }
template<>
inline bool AlmostEquals(float a, float b) { … }

template<>
inline bool AlmostEquals(double a, double b) { … }

}  // namespace internal

class MathUtil { … };

template<typename T>
bool MathUtil::WithinFractionOrMargin(const T x, const T y,
                                      const T fraction, const T margin) { … }

}  // namespace protobuf
}  // namespace google

#endif  // GOOGLE_PROTOBUF_STUBS_MATHUTIL_H_