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The C preprocessor (used with C, C++ and in other contexts) defines an include directive as a line that starts #include and is followed by a file specification. COBOL defines an include directive indicated by copy in order to include a copybook. Generally, for C/C++ the include directive is used to include a header file, but can
In C#, compiler directives are called pre-processing directives. There are a number of different compiler directives including #pragma, which is specifically used to control compiler warnings and debugger checksums. [5] [6] The SQLite DBMS includes a PRAGMA directive that is used to introduce commands that are not compatible with other DBMS. [7]
In the C and C++ programming languages, an #include guard, sometimes called a macro guard, header guard or file guard, is a way to avoid the problem of double inclusion when dealing with the include directive. The C preprocessor processes inclusion directives like #include "foo.h" to include "foo.h" and transcludes the code of that file into a ...
The file to embed is specified the same as for #include – either with brackets or double quotes. The directive also allows certain parameters to be passed to it to customize its behavior. The C standard defines some parameters and implementations may define additional. The limit parameter is used to limit the width of the included data.
Server Side Includes (SSI) is a simple interpreted server-side scripting language used almost exclusively for the World Wide Web.It is most useful for including the contents of one or more files into a web page on a web server (see below), using its #include directive.
Translation units define a scope, roughly file scope, and functioning similarly to module scope; in C terminology this is referred to as internal linkage, which is one of the two forms of linkage in C. Names (functions and variables) declared outside of a function block may be visible either only within a given translation unit, in which case they are said to have internal linkage – they are ...
using C preprocessor for JavaScript preprocessing. [3] [4] using C preprocessor for devicetree processing within the Linux kernel. [5] using M4 (see on-article example) or C preprocessor [6] as a template engine, to HTML generation. imake, a make interface using the C preprocessor, written for the X Window System but now deprecated in favour of ...
In the C language, the #include pre-compile directive always causes a file's contents to be inserted into the source at that point. Objective-C has the #import directive, equivalent except that each file is included only once per compilation unit, obviating the need for include guards .