High Quality Content by WIKIPEDIA articles! In computer programming, a pre-compiled header is a technique used by some C or C++ compilers to reduce compilation time. In the C and C++ programming languages, a header file is a file whose text may be automatically included in another source file by the C preprocessor, usually specified by the use of compiler directives in the source file. Header files can sometimes contain a very large amount of source code (for instance, the header files windows.h and Cocoa/Cocoa.h on Microsoft Windows and Mac OS X, respectively). To reduce compilation times some compilers allow header files to be precompiled into a form that is faster for the compiler to process. This intermediate form is known as a precompiled header, and is commonly held in a file named with the extensions .pch or .gch. A related feature is the prefix header, which is a file that is automatically included by the compiler without requiring the use of any compiler directives.

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