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In computer programming, conditional compilation is a compilation technique which results in differring executable programs depending on parameters specified. This technique is commonly used when these differences in the program are needed to run it on different platforms, or with different versions of required libraries or hardware.
Conditional compilation is supported via the if-else core directives #if, #else, #elif, and #endif and with contraction directives #ifdef and #ifndef which stand for #if defined(...) and #if !defined(...), respectively. In the following example code, the printf() call is only included for compilation if VERBOSE is defined.
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 ...
An expected minor difference in the first line, otherwise it works. This method is now documented in Advanced_templates on Meta. There are apparently some drawbacks with substituting templates containing many ifdef-constructs, it replaces pointless code for ifndef cases. -- Omniplex 01:58, 22 April 2006 (UTC)
The difference from weak symbols is that weak symbols are interpreted by the linker. The CPP is run during the compilation of each translation unit before the C compiler. The build process (e.g. make) can be implemented in a conditional way such that just different versions of a symbol are created or different (specialized) libraries are used ...
srcML (source M L) is a document-oriented XML representation of source code. It was created in a collaborative effort between Michael L. Collard and Jonathan I. Maletic.The abbreviation, srcML, is short for Source Markup Language. srcML wraps source code (text) with information from the Abstract Syntax Tree or AST (tags) into a single XML document.
An include directive instructs a text file processor to replace the directive text with the content of a specified file.. The act of including may be logical in nature. The processor may simply process the include file content at the location of the directive without creating a combined file.
The corresponding logical symbols are "", "", [6] and , [10] and sometimes "iff".These are usually treated as equivalent. However, some texts of mathematical logic (particularly those on first-order logic, rather than propositional logic) make a distinction between these, in which the first, ↔, is used as a symbol in logic formulas, while ⇔ is used in reasoning about those logic formulas ...