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std::numeric_limits::is_iec559

提供: cppreference.com

 
 
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Basic types
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基本的なタイプ
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Numeric limits
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numeric_limits
Cの数値は、インターフェイスを制限します
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enable_if(C++11)
conditional(C++11)
common_type(C++11)
underlying_type(C++11)
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Type trait constants
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integral_constant(C++11)
 
 
static const bool is_iec559
(C++11以前)
static constexpr bool is_iec559
(C++11およびそれ以降)
std::numeric_limits<T>::is_iec559の値は、すべての浮動小数点型trueIEC 559(T)規格の要求事項を満たすためIEEE 754です。 std::numeric_limits<T>::is_iec559trueであれば、std::numeric_limits<T>::has_infinitystd::numeric_limits<T>::has_quiet_NaN、そしてstd::numeric_limits<T>::has_signaling_NaNtrueです.
Original:
The value of std::numeric_limits<T>::is_iec559 is true for all floating-point types T which fulfill the requirements of IEC 559 (IEEE 754) standard. If std::numeric_limits<T>::is_iec559 is true, then std::numeric_limits<T>::has_infinity, std::numeric_limits<T>::has_quiet_NaN, and std::numeric_limits<T>::has_signaling_NaN are also true.
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[編集] 標準の専門分野

T
std::numeric_limits<T>::is_iec559の値
Original:
value of std::numeric_limits<T>::is_iec559
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/* non-specialized */ false
bool false
char false
signed char false
unsigned char false
wchar_t false
char16_t false
char32_t false
short false
unsigned short false
int false
unsigned int false
long false
unsigned long false
long long false
unsigned long long false
float
通常true
Original:
usually true
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double
通常true
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usually true
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long double
通常true
Original:
usually true
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[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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(パブリック静的メンバ定数) [edit]
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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(パブリック静的メンバ定数) [edit]
(NaN)の "非数値を合図する"特別な値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 "signaling not-a-number" (NaN)
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(パブリック静的メンバ定数) [edit]