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Being tightly integrated with the GNU system, GNU Emacs provides automatic formatting of C code to match the GNU coding standards. [1] Rather than manually modifying code formatting in a way that strays from the GNU coding standards, the formatted layout of the code can be tweaked by writing it in a more Emacs-friendly form—for example, by ...
Embeddable Common Lisp (ECL) is a small implementation of the ANSI Common Lisp programming language that can be used stand-alone or embedded in extant applications written in C. It creates OS-native executables and libraries (i.e. Executable and Linkable Format (ELF) files on unix) from Common Lisp code, and runs on most platforms that support ...
Both directives were added to C++23 standard and GCC 12. [17] Add #embed directive for binary resource inclusion and __has_embed allowing the availability of a resource to be checked by preprocessor directives. [18] Add #warning directive for diagnostics. [19] Add __has_include allowing the availability of a header to be checked by preprocessor ...
In Ruby, interpreter directives are referred to as pragmas and are specified by top-of-file comments that follow a key: value notation. For example, coding: UTF-8 indicates that the file is encoded via the UTF-8 character encoding. In C#, compiler directives are called pre-processing directives. There are a number of different compiler ...
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
The most common example of this is the C preprocessor, which takes lines beginning with '#' as directives. The C preprocessor does not expect its input to use the syntax of the C language. Some languages take a different approach and use built-in language features to achieve similar things. For example:
Defining compile-time variables, e.g. GBLC in HLASM; Iterating (repeating) code, e.g., the IRP [2] pseudo-op in FAP; Setting compile-time variables, e.g., SETC in HLASM; These are off the top of my head; there are many languages and many types of directives for which examples might be given.
Some compilers (for example, GCC [8]) provide built-in versions of many of the functions in the C standard library; that is, the implementations of the functions are written into the compiled object file, and the program calls the built-in versions instead of the functions in the C library shared object file.