TTS_ULP_EQUAL

#define TTS_ULP_EQUAL	(		L,
			R,
			N,
			...
	)		TTS_PRECISION(L,R,N,"ULP" , ::tts::ulp_distance , 2, __VA_ARGS__ )

Checks if two values are within a given ULP distance.

This comparison is performed by using the proper tts::ulp_distance overload.

Parameters

L,R	Expressions to compare.
N	Maximum ULPs accepted between L and R.
...	Optional tag. If equals to REQUIRED, this test will stop the program if it fails.

Example

#define TTS_MAIN
#include <tts/tts.hpp>
 
TTS_CASE( "ULP distance")
{
  float a{1};
  float eps  = std::numeric_limits<float>::epsilon();
  float qnan = std::numeric_limits<float>::quiet_NaN();
  float inf  = std::numeric_limits<float>::infinity();
  float minf = -inf;
 
  TTS_ULP_EQUAL(a    , a     , 0.  );
 
  TTS_ULP_EQUAL(a    , qnan  , inf );
  TTS_ULP_EQUAL(qnan , qnan  , 0.  );
 
  TTS_ULP_EQUAL(a    , inf   , inf );
  TTS_ULP_EQUAL(inf  , inf   , inf );
 
  TTS_ULP_EQUAL(a, a-eps   , 1   );
  TTS_ULP_EQUAL(a, a+eps   , 0.5 );
  TTS_ULP_EQUAL(a, a+3*eps , 1.5, REQUIRED );
};