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std::numeric_limits::denorm_min

提供: cppreference.com

 
 
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static T denorm_min()
(C++11以前)
static constexpr T denorm_min()
(C++11およびそれ以降)
非正規の値が、そうでなければTが返された場合、型std::numeric_limits<T>::has_denorm != std::denorm_absentの正の最小std::numeric_limits<T>::min()を返します。浮動小数点型の場合にのみ意味.
Original:
Returns the minimum positive 非正規の値 of the type T, if std::numeric_limits<T>::has_denorm != std::denorm_absent, otherwise returns std::numeric_limits<T>::min(). Only meaningful for floating-point types.
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目次

[編集] 値を返します

T std::numeric_limits<T>::denorm_min()
/* 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 2-149
if std::numeric_limits<float>::is_iec559 == true
double 2-1074
if std::numeric_limits<double>::is_iec559 == true
long double
/ *実装定義* /
Original:
/* implementation-defined */
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[編集] 例外

noexcept specification:  
noexcept
  (C++11およびそれ以降)

[編集]

denorm_min()の根本的なビット構造をDemonstates
Original:
Demonstates the underlying bit structure of the denorm_min()
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#include <cstdint>
#include <limits>
#include <cassert>
int main()
{
    // the smallest subnormal value has sign bit = 0, exponent = 0
    // and only the least significant bit of the fraction is 1
    uint32_t denorm_bits = 0x0001;
    float denorm_float = reinterpret_cast<float&>(denorm_bits);
    assert(denorm_float == std::numeric_limits<float>::denorm_min());
}


[編集] も参照してください

[静的]
指定された型の最小有限値を返します
Original:
returns the smallest finite value of the given type
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(パブリック静的メンバ関数) [edit]
[静的]
浮動小数点型で使用される非正規のスタイルを識別します
Original:
identifies the denormalization style used by the floating-point type
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(パブリック静的メンバ定数) [edit]
[静的] (C++11)
指定された型の最小有限値を返します
Original:
returns the lowest finite value of the given type
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(パブリック静的メンバ関数) [edit]