It's the layout of the code that allows Pascal (/Delphi) to compile everything in a single pass. By starting with the main file you easily build the tree of dep

It's the layout of the code that allows Pascal (/Delphi) to compile everything in a single pass. By starting with the main file you easily build the tree of deps and public interfaces/functions vs the private & implementation details. C and C++ even though they have header files, make no restriction on what goes in a header file, so it takes a bit to figure out the dep graph.