std::numeric_limits<T>::infinity (3) - Linux Manuals

std::numeric_limits<T>::infinity: std::numeric_limits<T>::infinity

NAME

std::numeric_limits<T>::infinity - std::numeric_limits<T>::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 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

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