std::numeric_limits::infinity
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<metanoindex/>
<tbody> </tbody> static T infinity() |
(até C++11) | |
static constexpr T infinity() |
(desde C++11) | |
Retorna o valor especial "infinito positivo", representado pelo
T tipo de ponto flutuante. Só faz sentido se std::numeric_limits<T>::has_infinity == true. Em IEEE 754, a representação binária mais comum de números de ponto flutuante, o infinito é o valor com todos os bits do expoente conjunto e todos os bits da fração limpo.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.The text has been machine-translated via Google Translate.
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Valor de retorno
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 |
Exceções
Exemplo
#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';
}
Saída:
inf is greater than 1.79769e+308