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std::numeric_limits::round_error

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std::numeric_limits
 
static T round_error()
(bis C + +11)
static constexpr T round_error()
(seit C++11)
Gibt den größten möglichen Rundungsfehler in ULPs (Einheiten in der letzten Stelle) nach ISO 10967 definiert, die von 0,5 (Rundung auf die nächste Stelle) bis 1,0 (Rundung auf Null oder unendlich) variieren kann. Es ist nur sinnvoll, wenn std::numeric_limits<T>::is_integer == false .
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Returns the largest possible rounding error in ULPs (units in the last place) as defined by ISO 10967, which can vary from 0.5 (rounding to the nearest digit) to 1.0 (rounding to zero or to infinity). It is only meaningful if std::numeric_limits<T>::is_integer == false.
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[Bearbeiten] Rückgabewert

T std::numeric_limits<T>::round_error()
/* non-specialized */ T();
bool false
char 0
signed char 0
unsigned char 0
wchar_t 0
char16_t 0
char32_t 0
short 0
unsigned short 0
int 0
unsigned int 0
long 0
unsigned long 0
long long 0
unsigned long long 0
float 0.5F
double 0.5
long double 0.5L

[Bearbeiten] Ausnahmen

noexcept specification:  
noexcept
  (seit C++11)

[Bearbeiten] Siehe auch

[statisch]
identifiziert die Rundung Stil vom Typ verwendet
Original:
identifies the rounding style used by the type
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(public static Mitglied konstanten) [edit]