LNK2019 unresolved error for inline function?

The common knowledge that inline function MUST be declared in the header file is no longer true. Since several years, most compilers implement a feature called Link Time Optimization (gcc) or Link Time Code Generation (VC) that save important information about inline functions (among others) allowing the linker to look at all the object files as "one big happy translation unit". Thus the linker can inline functions you put in a cpp file.

Inline functions must be defined in header files. (More specifically, the definition must be visible in every translation unit in which it is used.).

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