W3cubDocs

/C++

std::numeric_limits::infinity

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

std::numeric_limits::infinity

Return value

Exceptions

Example

See also