static T infinity(); | (until C++11) | |
static constexpr T infinity(); | (since C++11) |
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.
Return value
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 |
Exceptions
(none) | (until C++11) |
noexcept specification: noexcept | (since C++11) |
Example
#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
See also
[static] | identifies floating-point types that can represent the special value "positive infinity" (public static member constant) |
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