std::numeric_limits<T>::infinity
static T infinity() throw(); |
(until C++11) | |
static constexpr T infinity() noexcept; |
(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 |
char8_t (C++20) |
0 |
char16_t (C++11) |
0 |
char32_t (C++11) |
0 |
short |
0 |
unsigned short |
0 |
int |
0 |
unsigned int |
0 |
long |
0 |
unsigned long |
0 |
long long (C++11) |
0 |
unsigned long long (C++11) |
0 |
float |
HUGE_VALF |
double |
HUGE_VAL |
long double |
HUGE_VALL |
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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