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std::numeric_limits::quiet_NaN

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std::numeric_limits
 
static T quiet_NaN()
(hasta C++11)
static constexpr T quiet_NaN()
(desde C++11)
Devuelve el valor especial "no un número tranquila", como se representa por la T tipo de punto flotante. Sólo tiene sentido si std::numeric_limits<T>::has_quiet_NaN == true. En IEEE 754, la representación binaria más común de números de punto flotante, cualquier valor con todos los bits del conjunto de exponente y al menos un bit de la serie fracción representa un NaN. Se definido por la implantación que los valores de la fracción representan NaNs tranquilas o singaling, y si el bit de signo es significativo .
Original:
Returns the special value "quiet no un número", as represented by the floating-point type T. Only meaningful if std::numeric_limits<T>::has_quiet_NaN == true. In IEEE 754, the most common binary representation of floating-point numbers, any value with all bits of the exponent set and at least one bit of the fraction set represents a NaN. It is implementation-defined which values of the fraction represent quiet or singaling NaNs, and whether the sign bit is meaningful.
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Contenido

[editar] Valor de retorno

T std::numeric_limits<T>::quiet_NaN()
/* 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
NAN u otra aplicación definida por NaN
Original:
NAN or another implementation-defined NaN
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double
definido por la implantación
Original:
implementation-defined
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long double
definido por la implantación
Original:
implementation-defined
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[editar] Excepciones

noexcept specification:  
noexcept
  (desde C++11)

[editar] Notas

A NaN nunca compara igual a sí mismo. Copia de un NaN no puede preservar su representación poco .
Original:
A NaN never compares equal to itself. Copying a NaN may not preserve its bit representation.
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[editar] Ejemplo

Varias maneras de generar un NaN (la cadena de salida es específica del compilador)
Original:
Several ways to generate a NaN (the output string is compiler-specific)
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#include <iostream>
#include <limits>
#include <cmath>
int main()
{
    std::cout << std::numeric_limits<double>::quiet_NaN() << ' '
              << std::numeric_limits<double>::signaling_NaN() << ' '
              << std::acos(2) << ' '
              << std::tgamma(-1) << ' '
              << std::log(-1) << ' '
              << std::sqrt(-1) << ' '
              << 0 / 0.0 << '\n';
 
    std::cout << "NaN == NaN? " << std::boolalpha
              << ( std::numeric_limits<double>::quiet_NaN()
                   == std::numeric_limits<double>::quiet_NaN() ) << '\n';
}

Salida:

nan nan nan nan nan -nan -nan
NaN == NaN? false

[editar] Ver también

[estático]
identifica tipos de punto flotante que puede representar el valor especial "tranquilo, no un número" (NaN)
Original:
identifies floating-point types that can represent the special value "quiet not-a-number" (NaN)
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(miembro público estático constante) [editar]
[estático]
devuelve un valor NaN de señalización de lo dado tipo de punto flotante
Original:
returns a signaling NaN value of the given floating-point type
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(función miembro público estático) [editar]