What header-file-name convention is best? foo.H? foo.hh? foo.hpp?, C++ FAQ

C++ FAQ

From Marshall Cline: Bjarne Stroustrup, Herb Sutter, Andrei Alexandrescu, Pearson / Addison-Wesley Publishers and I collaborated to create a new C++ Super-FAQ! It's a team effort, with huge contributions from each of us and with amazing support from dozens of brilliant editors. The result is "awesomer" than ever! I originally wrote/published the FAQ in 1991 and now look forward to this new phase - and to continue working with it for another 20 years!

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FAQ: What header-file-name convention is best? `foo.H`? `foo.hh`? `foo.hpp`? ←(in the new Super-FAQ)

It's in Section: Coding standards:

FAQ: What are some good C++ coding standards?
FAQ: Are coding standards necessary? Are they sufficient?
FAQ: Should our organization determine coding standards from our C experience?
FAQ: What's the difference between <xxx> and <xxx.h> headers?
FAQ: Should I use using namespace std in my code?
FAQ: Is the ?: operator evil since it can be used to create unreadable code?
FAQ: Should I declare locals in the middle of a function or at the top?
FAQ: What source-file-name convention is best? foo.cpp? foo.C? foo.cc?
FAQ: What header-file-name convention is best? foo.H? foo.hh? foo.hpp? (this FAQ)
FAQ: Are there any lint-like guidelines for C++?
FAQ: Why do people worry so much about pointer casts and/or reference casts?
FAQ: Which is better: identifier names that_look_like_this or identifier names thatLookLikeThis?
FAQ: Are there any other sources of coding standards?
FAQ: Should I use "unusual" syntax?
FAQ: What's a good coding standard for using global variables?