std::numeric_limits<T>::infinity
From cppreference.com
< cpp | types | numeric limits
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 (since C++20) | 0 |
| char16_t (since C++11) | 0 |
| char32_t (since C++11) | 0 |
| short | 0 |
| unsigned short | 0 |
| int | 0 |
| unsigned int | 0 |
| long | 0 |
| unsigned long | 0 |
| long long (since C++11) | 0 |
| unsigned long long (since C++11) | 0 |
| float | HUGE_VALF |
| double | HUGE_VAL |
| long double | HUGE_VALL |
Example
Run this code
#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) |