offset_ptr: fix __cplusplus check for msvc

felixguendling / cista

Cista is a simple, high-performance, zero-copy C++ serialization & reflection library.

https://cista.rocks

MIT License

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Closed pablohoch closed 11 months ago

pablohoch commented 11 months ago

Fixes compilation using MSVC 17.7 if /Zc:__cplusplus is not set