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std::numeric_limits::has_denorm_loss

Da cppreference.com.

 
 
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static const bool has_denorm_loss
(C fino + 11)
static constexpr bool has_denorm_loss
(dal C++11)
Il valore di std::numeric_limits<T>::has_denorm_loss è true per tutti i tipi a virgola mobile T in grado di distinguere la perdita di precisione a causa di denormalizzazione da altre cause di risultato inesatte.
Original:
The value of std::numeric_limits<T>::has_denorm_loss is true for all floating-point types T capable of distinguishing loss of precision due to denormalization from other causes of inexact result.
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Indice

[modifica] Specializzazioni standard

T
valore di std::numeric_limits<T>::has_denorm_loss
Original:
value of std::numeric_limits<T>::has_denorm_loss
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/* non-specialized */ false
bool false
char false
signed char false
unsigned char false
wchar_t false
char16_t false
char32_t false
short false
unsigned short false
int false
unsigned int false
long false
unsigned long false
long long false
unsigned long long false
float
implementazione definita
Original:
implementation-defined
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double
implementazione definita
Original:
implementation-defined
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long double
implementazione definita
Original:
implementation-defined
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[modifica] Note

Previste dalle normative IEE 754 in virgola mobile implementazioni può rilevare in virgola mobile underflow in tre momenti predefiniti:
Original:
Standard-compliant IEE 754 floating-point implementations may detect the floating-point underflow at three predefined moments:
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1)
dopo il calcolo di un risultato di valore assoluto inferiore a std::numeric_limits<T>::min(), tale attuazione rileva tinyness prima di arrotondare.
Original:
after computation of a result with absolute value smaller than std::numeric_limits<T>::min(), such implementation detects tinyness before rounding.
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2)
dopo l'arrotondamento del risultato a pezzi std::numeric_limits<T>::digits, se il risultato è molto piccolo, tale attuazione rileva tinyness dopo l'arrotondamento.
Original:
after rounding of the result to std::numeric_limits<T>::digits bits, if the result is tiny, such implementation detects tinyness after rounding.
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3)
se la conversione del risultato arrotondato minuscolo a forma subnormal provocato la perdita di precisione, tale attuazione rileva la perdita denorm.
Original:
if the conversion of the rounded tiny result to subnormal form resulted in the loss of precision, such implementation detects denorm loss.
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[modifica] Esempio

[modifica] Vedi anche

identifica i tipi a virgola mobile che rilevano tinyness prima dell'arrotondamento
Original:
identifies floating-point types that detect tinyness before rounding
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(pubblico membro statico costante) [edit]
[statico]
identifica lo stile denormalizzazione utilizzato dal tipo a virgola mobile
Original:
identifies the denormalization style used by the floating-point type
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(pubblico membro statico costante) [edit]