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.h

Low risk

C / C++ header

A C or C++ header file. Declares types, function prototypes, and macros pulled into other sources via `#include`.

MIME types

  • text/x-c
  • text/x-chdr

Category

code

Aliases

.hpp / .hxx

What opens this file

  • gcc / clang / MSVC
  • VS Code + C/C++ extension
  • CLion

How to open by OS

Windows

  • MSVC, MinGW.

Mac

  • clang (Xcode).

Linux

  • gcc, clang.

Ios

  • Remote build.

Android

  • NDK.

Safety notes

  • Headers don't usually execute code, but preprocessor macros can rewrite semantics in ways that are hard to notice.

Common mistakes

  • Forgetting include guards (#pragma once or #ifndef) causes duplicate-definition errors.
  • Putting too much implementation in headers balloons compile time. Split declaration and definition.

Related extensions

References