<QFloat16> - 16-bit Floating Point Support▲
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Header: QFloat16
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Since: Qt 5.9
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Group: <QFloat16> is part of funclists
Detailed Description▲
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.
Function Documentation▲
[since 5.11] Q_DECL_EXPORT qFloatFromFloat16(float *out, const qfloat16 *in, qsizetype len)▲
Converts len qfloat16 from in to floats and stores them in out. Both in and out must have len allocated entries.
This function was introduced in Qt 5.11.
[since 5.11] Q_DECL_EXPORT qFloatToFloat16(qfloat16 *out, const float *in, qsizetype len)▲
Converts len floats from in to qfloat16 and stores them in out. Both in and out must have len allocated entries.
This function was introduced in Qt 5.11.
Q_REQUIRED_RESULT qIsFinite(qfloat16 f)▲
Q_REQUIRED_RESULT qIsInf(qfloat16 f)▲
Q_REQUIRED_RESULT qIsNaN(qfloat16 f)▲
Q_REQUIRED_RESULT qRound(qfloat16 value)▲
Macro Documentation▲
[since 5.12.4] QT_NO_FLOAT16_OPERATORS▲
Defining this macro disables the arithmetic operators for qfloat16.
This is only necessary on Visual Studio 2017 (and earlier) when including <QFloat16> and <bitset> in the same translation unit, which would otherwise cause a compilation error due to a toolchain bug (see [QTBUG-72073]).
This macro was introduced in Qt 5.12.4.