Harold Pratt 223e11a52e Rewrite CompactValue to avoid undefined C++ behavior. ...

C++ does not, pedantically, allow the use of unions for type-punning in the way that C does. Most compilers, in practice, do support it; however, recent versions of MSVC appear to have a bug that cause bad code to be generated due to this U.B. (see: https://developercommunity.visualstudio.com/t/Bad-code-generated-for-std::isnan-compil/10082631). This led to a series of issues in the react-native-windows project, see:
* https://github.com/microsoft/react-native-windows/issues/4122
* https://github.com/microsoft/react-native-windows/issues/8675

In C++20, the `<bit>` header and `bit_cast` function provide a pleasant API for type-punning. Since C++20 is not universally available, if the feature-test macro for `bit_cast` is not defined, memcpy is used instead.

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..

event

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internal

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BitUtils.h

Make all headers public and add #ifdef __cplusplus (#1150)

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CompactValue.h

Rewrite CompactValue to avoid undefined C++ behavior.

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log.cpp

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log.h

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Utils.cpp

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Utils.h

Make all headers public and add #ifdef __cplusplus (#1150)

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YGConfig.cpp

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YGConfig.h

Make all headers public and add #ifdef __cplusplus (#1150)

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YGEnums.cpp

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YGEnums.h

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YGFloatOptional.h

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YGLayout.cpp

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YGLayout.h

Make all headers public and add #ifdef __cplusplus (#1150)

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YGMacros.h

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YGNode.cpp

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YGNode.h

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YGNodePrint.cpp

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YGNodePrint.h

Make all headers public and add #ifdef __cplusplus (#1150)

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YGStyle.cpp

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YGStyle.h

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YGValue.cpp

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YGValue.h

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Yoga-internal.h

Make all headers public and add #ifdef __cplusplus (#1150)

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Yoga.cpp

Use logical operator instead of bit operation

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Yoga.h

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