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std::numeric_limits::has_denorm_loss

STD：：数字[医]限制：：[医]脱诺姆[医]损失

static const bool has_denorm_loss;​(until C++11)
static constexpr bool has_denorm_loss;​(since C++11)

价值std::numeric_limits<T>::has_denorm_loss是true适用于所有浮点类型。T当将低于正常值的数字创建为非正态化损失时，而不是作为不精确的结果%28(见%29以下)时，将检测精度损失。

标准专业化

Tvalue of std::numeric_limits::has_denorm_loss
/* non-specialized */false
boolfalse
charfalse
signed charfalse
unsigned charfalse
wchar_tfalse
char16_tfalse
char32_tfalse
shortfalse
unsigned shortfalse
intfalse
unsigned intfalse
longfalse
unsigned longfalse
long longfalse
unsigned long longfalse
floatimplementation-defined
doubleimplementation-defined
long doubleimplementation-defined

注记

标准兼容的ieee 754浮点实现要求低于正常值的数字，以检测与创建该数字相关的准确性损失(如果发生这种情况)，并且可以使用以下两种不同的方式之一：

1%29非正态化损失：交付的结果与指数范围无界时的计算结果不同。

2%~29不精确结果：所给出的结果与指数范围和精度无界的计算结果不同。

不存在去正态化丢失机制的实现，在舍入后检测到28%的精度损失，不精确结果%29，并且在IEEESTD 754的2008修订版中删除了此选项。

libstdc++、libc++、libCstd和stlport 4为所有浮点类型定义了这个常量为false。MicrosoftVisualStudio将其定义为所有浮点类型的真。

与任何浮点计算一样，精度损失可能会增加。FE_INEXACT...

例

另见

tinyness_before staticidentifies floating-point types that detect tinyness before rounding (public static member constant)
has_denorm staticidentifies the denormalization style used by the floating-point type (public static member constant)

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