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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] The C standard library is declared as a collection of header files. The C++ standard library is similar, but the declarations may be provided by the ...
It, however, is only defined for the request header. Its meaning in a response header is not specified. [77] The behavior of Pragma: no-cache in a response is implementation specific. While some user agents do pay attention to this field in responses, [78] the HTTP/1.1 RFC specifically warns against relying on this behavior.
This header is part of neither ISO C nor POSIX. The file, as defined in the second version of the Single UNIX Specification, simply contains all of the functionality of C89 stdarg.h, with the exceptions that: it cannot be used in standard C new-style definitions; the given argument may be omitted (standard C requires at least one argument)
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.
[6] [7] [8] An X-Macro is a header file. Commonly, these use the extension .def instead of the traditional .h. This file contains a list of similar macro calls, which can be referred to as "component macros." The include file is then referenced repeatedly. Many compilers define additional, non-standard macros, although these are often poorly ...
The application programming interface (API) of the C standard library is declared in a number of header files. Each header file contains one or more function declarations, data type definitions, and macros. After a long period of stability, three new header files (iso646.h, wchar.h, and wctype.h) were added with Normative Addendum 1 (NA1), an ...
An "encoding sniffing algorithm" is defined in the specification to determine the character encoding of the document based on multiple sources of input, including: Explicit user instruction; An explicit meta tag within the first 1024 bytes of the document; A byte order mark (BOM) within the first three bytes of the document
In the C and C++ programming languages, unistd.h is the name of the header file that provides access to the POSIX operating system API. [1] It is defined by the POSIX.1 standard, the base of the Single Unix Specification, and should therefore be available in any POSIX-compliant operating system and compiler.