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std::numeric_limits::infinity

提供: cppreference.com

 
 
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static T infinity()
(C + + 11時まで)
static constexpr T infinity()
(C + + 11以来)
浮動小数点型のTによって表されるように、特殊な値 "正の無限大"を返します。 std::numeric_limits<T>::has_infinity == true場合のみ意味。 IEEE 754では、浮動小数点数の最も一般的なバイナリ表現では、正の無限大は、指数·セットのすべてのビットをクリアし、分数のすべてのビットがある値です.
Original:
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.
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目次

[編集] 値を返します

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

[編集] 例外

noexcept specification:  
noexcept
  (C + + 11以来)

[編集]

#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


[編集] も参照してください

特殊な値 "正の無限大"を表すことができます浮動小数点型を識別します
Original:
identifies floating-point types that can represent the special value "positive infinity"
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(公共の静的メンバ定数) [edit]