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std::numeric_limits::infinity

STD：：数字[医]极限：：无穷大

static T infinity(​(until C++11)
static constexpr T infinity(​(since C++11)

返回特殊值“正无穷大”，如浮点类型所表示。T.只有在以下情况下才有意义std::numeric_limits<T>::has_infinity==true在ieee 754中，浮点数的最常见的二进制表示形式，正无穷大是指数集的所有位数和所有位数的清除值。

返回值

Tstd::numeric_limits::infinity()
/* non-specialized */T(
boolfalse
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​
floatHUGE_VALF
doubleHUGE_VAL
long doubleHUGE_VALL

例外

(none)(until C++11)
noexcept specification: noexcept(since C++11)

例

二次

#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';
}

二次

产出：

二次

inf is greater than 1.79769e+308

二次

另见

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

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