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In computer programming, a precompiled header (PCH) is a (C or C++) header file that is compiled into an intermediate form that is faster to process for the compiler.Usage of precompiled headers may significantly reduce compilation time, especially when applied to large header files, header files that include many other header files, or header files that are included in many translation units.
For #include guards to work properly, each guard must test and conditionally set a different preprocessor macro. Therefore, a project using #include guards must work out a coherent naming scheme for its include guards, and make sure its scheme doesn't conflict with that of any third-party headers it uses, or with the names of any globally visible macros.
The header keeps the interface separate from the implementation. [3] Compilation errors may occur if multiple header files include the same file. One solution is to avoid including files in header files – possibly requiring excessive include directives in body files. Another solution is to use an include guard in each header file. [4]
Headers may also be imported using import, even if they are not declared as modules - these are called "header units". [28] The syntax is similar to including a header, with the difference being that #include is replaced with import and a semicolon is placed at the end of the statement. The semantics of searching for the file depending on ...
IMAGE_COR20_HEADER strongly resembles PE's optional header, essentially playing its role for the CLR loader. [4] The CLR-related data, including the root structure itself, is typically contained in the common code section, .text. It is composed of a few directories: metadata, embedded resources, strong names and a few for native-code ...
The C POSIX library is a specification of a C standard library for POSIX systems. It was developed at the same time as the ANSI C standard. Some effort was made to make POSIX compatible with standard C; POSIX includes additional functions to those introduced in standard C.