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std::numeric_limits::infinity

Da cppreference.com.

 
 
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static T infinity()
(C fino + 11)
static constexpr T infinity()
(dal C++11)
Restituisce il valore speciale "infinito positivo", come rappresentato dalla virgola mobile T tipo. Ha senso solo se std::numeric_limits<T>::has_infinity == true. In IEEE 754, la rappresentazione binaria più comune di numeri a virgola mobile, l'infinito positivo è il valore di tutti i bit del set esponente e tutti i bit della frazione cancellato.
Original:
Returns the special value "positive infinity", as represented by the floating-point type T. Only meaningful if std::numeric_limits<T>::has_infinity == true. In IEEE 754, the most common binary representation of floating-point numbers, the positive infinity is the value with all bits of the exponent set and all bits of the fraction cleared.
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Indice

[modifica] Valore di ritorno

T std::numeric_limits<T>::infinity()
/* 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 HUGE_VALF
double HUGE_VAL
long double HUGE_VALL

[modifica] Eccezioni

noexcept specification:  
noexcept
  (dal C++11)

[modifica] Esempio

#include <iostream>
#include <limits>
int main()
{
    double max = std::numeric_limits<double>::max();
    double inf = std::numeric_limits<double>::infinity();
 
    if(inf > max)
        std::cout << inf << " is greater than " << max << '\n';
}

Output:

inf is greater than 1.79769e+308


[modifica] Vedi anche

[statico]
identifica i tipi a virgola mobile che possono rappresentare la speciale "positive infinity" valore
Original:
identifies floating-point types that can represent the special value "positive infinity"
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(pubblico membro statico costante) [edit]