I agree. The concept of single-file or header-only libraries is often abused. Except when generics are involved, having a .c/.cpp source file is preferred. Note

I agree. The concept of single-file or header-only libraries is often abused. Except when generics are involved, having a .c/.cpp source file is preferred. Note that while the repo is named "single_file_libs", many libraries in it consist of a pair of .c and .h files. These developers also agree with you.