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std::numeric_limits::infinity

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C++
 
Utilità libreria
Tipo di supporto (basic types, RTTI, type traits)
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Programma di utilità
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Funzione oggetti
initializer_list(C++11)
bitset
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rel_ops::operator!=
rel_ops::operator>
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rel_ops::operator>=
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Tipi base
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Limiti numerici
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numeric_limits
C numerico limita interfaccia
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integral_constant(C++11)
 
std::numeric_limits
Costanti statiche
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numeric_limits::is_specialized
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numeric_limits::min
numeric_limits::lowest(C++11)
numeric_limits::max
numeric_limits::epsilon
numeric_limits::round_error
numeric_limits::infinity
numeric_limits::quiet_NaN
numeric_limits::signaling_NaN
numeric_limits::denorm_min
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Helper types
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float_round_style
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static T infinity()
 (fino al c++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) [modifica]
Estratto da "https://it.cppreference.com/mwiki/index.php?title=cpp/types/numeric_limits/infinity&oldid=27073"