When writing C++ code, I often start by writing full \'implementation\' code in my header files, then later need to refactor the implementation into a .cpp file.
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There is Lazy C++ where you only write one .lzz file and it generates .h and .cpp for you.
I am really looking forward for C++ modules where you only write .cpp and the import file is generated automatically. But we will have to wait for a few years even though Clang has started to implement modules. Here are some examples.