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std::numeric_limits::quiet_NaN

提供: cppreference.com

 
 
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static T quiet_NaN()
(C + + 11時まで)
static constexpr T quiet_NaN()
(C + + 11以来)
浮動小数点型の非数値によって表されるように特別な値 "静かT"が返されます。 std::numeric_limits<T>::has_quiet_NaN == 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、すべての指数セットのビットと分数のセットの少なくとも1つのビットを持つ任意の値はNaNを表します。これは、分数の値がquietまたはsingaling NaNを表す実装定義され、符号ビットは意味があるかどうか.
Original:
Returns the special value "quiet 非数値", as represented by the floating-point type T. Only meaningful if std::numeric_limits<T>::has_quiet_NaN == true. In IEEE 754, the most common binary representation of floating-point numbers, any value with all bits of the exponent set and at least one bit of the fraction set represents a NaN. It is implementation-defined which values of the fraction represent quiet or singaling NaNs, and whether the sign bit is meaningful.
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目次

[編集] 値を返します

T std::numeric_limits<T>::quiet_NaN()
/* 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
NANまたは別の実装定義はNaN
Original:
NAN or another implementation-defined NaN
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double
実装定義である
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implementation-defined
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long double
実装定義である
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implementation-defined
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[編集] 例外

noexcept specification:  
noexcept
  (C + + 11以来)

[編集] ノート

NaNはそれ自体に等しいことはありません。 NaNをコピーすると、そのビット表現を保存しないかもしれない.
Original:
A NaN never compares equal to itself. Copying a NaN may not preserve its bit representation.
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[編集]

NaNを(出力文字列は、コンパイラ固有のものです)を生成するには、いくつかの方法
Original:
Several ways to generate a NaN (the output string is compiler-specific)
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#include <iostream>
#include <limits>
#include <cmath>
int main()
{
    std::cout << std::numeric_limits<double>::quiet_NaN() << ' '
              << std::numeric_limits<double>::signaling_NaN() << ' '
              << std::acos(2) << ' '
              << std::tgamma(-1) << ' '
              << std::log(-1) << ' '
              << std::sqrt(-1) << ' '
              << 0 / 0.0 << '\n';
 
    std::cout << "NaN == NaN? " << std::boolalpha
              << ( std::numeric_limits<double>::quiet_NaN()
                   == std::numeric_limits<double>::quiet_NaN() ) << '\n';
}

Output:

nan nan nan nan nan -nan -nan
NaN == NaN? false

[編集] も参照してください

特殊な値 "静かな非数値"(NaN)を表すことができる浮動小数点型を識別します
Original:
identifies floating-point types that can represent the special value "quiet not-a-number" (NaN)
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(公共の静的メンバ定数) [edit]
与えられた浮動小数点型のシグナリングNaN値を返します
Original:
returns a signaling NaN value of the given floating-point type
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(公共の静的メンバ関数) [edit]