Can modern C++ compilers inline functions that are defined in a cpp file

Question

I am aware that the keyword inline has useful properties e.g. for keeping template specializations inside a header file. On the other hand I have often read tha

Answer 1

The standard dictates nothing about how a function can be inlined. And compilers can inline functions if they have access to their implementation. If you only have a header with binaries, it would be impossible. If it's in the same module, the compiler can inline the function even if it is in the cpp file.