math.h

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/******************************************************************************
The MIT License(MIT)
 
Embedded Template Library.
https://github.com/ETLCPP/etl
https://www.etlcpp.com
 
Copyright(c) 2023 John Wellbelove
 
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#ifndef ETL_MATH_INCLUDED
#define ETL_MATH_INCLUDED
 
#include "platform.h"
 
#if ETL_NOT_USING_STL && defined(ETL_COMPILER_ARM5) && !defined(__USE_C99_MATH)
  // Required for nan, nanf, nanl
  #define __USE_C99_MATH
#endif
 
#include <float.h>
#include <math.h>
 
#include "limits.h"
#include "type_traits.h"
 
namespace etl
{
  //***************************************************************************
  // is_nan
  //***************************************************************************
#if ETL_USING_CPP11 && !defined(ETL_NO_CPP_NAN_SUPPORT)
  template <typename T>
  ETL_CONSTEXPR typename etl::enable_if<etl::is_floating_point<T>::value, bool>::type is_nan(T value)
  {
    return fpclassify(value) == FP_NAN;
  }
#else
  #include "private/diagnostic_float_equal_push.h"
  template <typename T>
  ETL_CONSTEXPR typename etl::enable_if<etl::is_floating_point<T>::value, bool>::type is_nan(T value)
  {
    return (value != value);
  }
  #include "private/diagnostic_pop.h"
#endif
 
  template <typename T>
  ETL_CONSTEXPR typename etl::enable_if<etl::is_integral<T>::value, bool>::type is_nan(T)
  {
    return false;
  }
 
  //***************************************************************************
  // is_infinity
  //***************************************************************************
#if ETL_USING_CPP11 && !defined(ETL_NO_CPP_NAN_SUPPORT)
  template <typename T>
  ETL_CONSTEXPR typename etl::enable_if<etl::is_floating_point<T>::value, bool>::type is_infinity(T value)
  {
    return fpclassify(value) == FP_INFINITE;
  }
#else
  #include "private/diagnostic_float_equal_push.h"
  template <typename T>
  ETL_CONSTEXPR typename etl::enable_if<etl::is_floating_point<T>::value, bool>::type is_infinity(T value)
  {
    return ((value == etl::numeric_limits<T>::infinity()) || (value == -etl::numeric_limits<T>::infinity()));
  }
  #include "private/diagnostic_pop.h"
#endif
 
  template <typename T>
  ETL_CONSTEXPR typename etl::enable_if<etl::is_integral<T>::value, bool>::type is_infinity(T)
  {
    return false;
  }
 
  //***************************************************************************
  // is_zero
  //***************************************************************************
#if ETL_USING_CPP11 && !defined(ETL_NO_CPP_NAN_SUPPORT)
  template <typename T>
  ETL_CONSTEXPR typename etl::enable_if<etl::is_floating_point<T>::value, bool>::type is_zero(T value)
  {
    return fpclassify(value) == FP_ZERO;
  }
#else
  #include "private/diagnostic_float_equal_push.h"
  template <typename T>
  ETL_CONSTEXPR typename etl::enable_if<etl::is_floating_point<T>::value, bool>::type is_zero(T value)
  {
    return value == 0;
  }
  #include "private/diagnostic_pop.h"
#endif
 
  template <typename T>
  ETL_CONSTEXPR typename etl::enable_if<etl::is_integral<T>::value, bool>::type is_zero(T value)
  {
    return (value == 0);
  }
 
  //***************************************************************************
  // is_exactly_equal
  //***************************************************************************
#include "private/diagnostic_float_equal_push.h"
  template <typename T>
  ETL_CONSTEXPR bool is_exactly_equal(T value1, T value2)
  {
    return value1 == value2;
  }
#include "private/diagnostic_pop.h"
} // namespace etl
 
#endif