<QFloat16>

该文档编制在 Qt 5.9 引入。

函数

bool	qFuzzyCompare (qfloat16 p1 , qfloat16 p2 )
bool	qIsFinite (qfloat16 f )
bool	qIsInf (qfloat16 f )
bool	qIsNaN (qfloat16 f )
qint64	qRound64 (qfloat16 value )
int	qRound (qfloat16 value )

This header file provides support for half-precision (16-bit) floating point data with the class qfloat16 . It is fully compliant with IEEE 754 as a storage type. This implies that any arithmetic operation on a qfloat16 instance results in the value first being converted to a float . This conversion to and from float is performed by hardware when possible, but on processors that do not natively support half-precision, the conversion is performed through a sequence of lookup table operations.

qfloat16 should be treated as if it were a POD (plain old data) type. Consequently, none of the supported operations need any elaboration beyond stating that it supports all arithmetic operators incident to floating point types.

函数文档编制

bool qFuzzyCompare ( qfloat16 p1 , qfloat16 p2 )

比较浮点值 p1 and p2 并返回 true 若它们被认为相等，否则 false .

The two numbers are compared in a relative way, where the exactness is stronger the smaller the numbers are.

bool qIsFinite ( qfloat16 f )

返回 true 若 qfloat16 f 是有限数。

另请参阅 qIsFinite.

bool qIsInf ( qfloat16 f )

返回 true 若 qfloat16 f 相当于无穷大。

另请参阅 qIsInf.

bool qIsNaN ( qfloat16 f )

返回 true 若 qfloat16 f 是 NaN (非数字)。

另请参阅 qIsNaN.

qint64 qRound64 ( qfloat16 value )

圆整 value 到最近 64 位整数。

另请参阅 qRound64.

int qRound ( qfloat16 value )

圆整 value 到最近整数。

另请参阅 qRound.