NAME

std::numeric_limits::infinity - std::numeric_limits::infinity

Synopsis

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

// 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

has_infinity identifies floating-point types that can represent the special value
[static] "positive infinity"
(public static member constant)