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 |
| signedchar |
0 |
| unsignedchar |
0 |
| wchar_t |
0 |
| char8_t (since C++20) |
0 |
| char16_t (since C++11) |
0 |
| char32_t (since C++11) |
0 |
| short |
0 |
| unsignedshort |
0 |
| int |
0 |
| unsignedint |
0 |
| long |
0 |
| unsignedlong |
0 |
| longlong (since C++11) |
0 |
| unsignedlonglong (since C++11) |
0 |
| float |
HUGE_VALF |
| double |
HUGE_VAL |
| longdouble |
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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