c preprocessor การใช้

• When run through the C preprocessor, the following code is generated.
• One little-known usage pattern of the C preprocessor is known as X-Macros.
• For example, using the C preprocessor, one might define a macro DebugOut as follows:
• In the source file by the C preprocessor by the use of a preprocessor directive in the source file.
• C preprocessor ( CPP ) conditional constructs can also be used to switch between different versions of a symbol.
• GenVoca features were originally implemented using C preprocessor ( # ifdef feature . . . # endif ) techniques.
• For a precise demonstration imagine the use of a C preprocessor to expand the RefLib script templates into standard instructions.
• Imake generates makefiles from a template, a set of C preprocessor macro functions, and a per-directory input file called an Imakefile.
• Two contest winners generated a list of prime numbers using the C preprocessor " spectacularly ", according to " Dr . Dobbs ".
• Macro languages may be restricted to acting on specially labeled code regions ( pre-fixed with a # in the case of the C preprocessor ).
• Internal linkage in C is visibility at the translation unit level, namely a source file after being processed by the C preprocessor, notably including all relevant includes.
• Winning entries are awarded with a category, such as " Worst Abuse of the C preprocessor " or " Most Erratic Behavior ", and then announced on the official IOCCC website.
• The UPC language evolved from experiences with three other earlier languages that proposed parallel extensions to ISO C 99 : AC, Split-C, and Parallel C Preprocessor ( PCP ).
• Examples : a " general purpose " macro language, like C preprocessor macro language is not, so any algorithm expressed in " C preprocessor " is a " simple algorithm ".
• Examples : a " general purpose " macro language, like C preprocessor macro language is not, so any algorithm expressed in " C preprocessor " is a " simple algorithm ".
• Note that unlike certain previous macro processors inside assemblers, the C preprocessor is not Turing-complete because it lacks the ability to either loop or " go to ", the latter allowing programs to loop.
• All information from the input source code is carefully preserved in the ROSE IR, including C preprocessor control structure, source comments, source position information, and C + + template information, e . g ., template arguments.
• Today directives are best known in the C language, of early 1970s vintage, and continued through the current C99 standard, where they are either instructions to the C preprocessor, or, in the form of # pragma, directives to the compiler itself.
• However, since the C preprocessor does not have features of some other preprocessors, such as recursive macros, selective expansion according to quoting, string evaluation in conditionals, and Turing completeness, it is very limited in comparison to a more general macro processor such as m4.
• The PL / I F compiler's compile time preprocessor was unusual ( outside the Lisp world ) in using its target language's syntax and semantics ( " e . g . " as compared to the C preprocessor's " # " directives ).