H, hpp, & hxx

Filename extensions: H, hpp, & hxx

(related variations: H hpp hxx)
A header file written in the C++ programming language. It should be in simple ASCII and (depending upon how portably it was written) should be usable on any machine with a C++ compiler. Typically it would be used in conjunction with a C file. Note that the h extension is also sometimes used for C++ header files.