C++ 2019 ~upd~ Jun 2026

: While C++20 was still being finalized, Visual C++ 2019 introduced "preview" flags that allowed developers to test experimental features like Modules .

1>------ Build started: Project: Reconstructor, Configuration: Release x64 ------ 1>Reconstructor.cpp 1>Reconstructor.obj : error LNK2001: unresolved external symbol "private: virtual void __cdecl VoxelGrid::serialize(class Archive &)" (?serialize@VoxelGrid@@EEAAXAEAVArchive@@@Z) 1>C:\Dev\Reconstructor\x64\Release\Reconstructor.exe : fatal error LNK1120: 1 unresolved externals c++ 2019

His eyes darted to the calling convention. UEAAX vs UEAAX … no. Then he saw it. The const -ness of the Archive& parameter. : While C++20 was still being finalized, Visual