C++ 2019 -

He had missed the const .

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

Tomorrow, he would refactor it to C++20. He heard std::span was finally stable. But tonight, he had earned his sleep.

It was a cold November night in 2019. Rain lashed against the window of Leo’s tiny home office, but he didn’t notice. His screen glowed with the familiar, comforting, and utterly infuriating blue light of Visual Studio 2019.

In the header, he had declared: virtual void serialize(const Archive& ar) override;