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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.
Provides warnings if tagged parameters do not match code, parsed parameters included in XML output and Doxygen-style tagfile (-D flag in 8.7). Partial C preprocessor support with -p flag. Support for #if/#ifdef control over documentation inclusion using the -D and -U command-line flags. Imagix 4D: customizable through style sheets and CSS
(chooses between multiple alternatives based on the value of the test string—basically equivalent to a chain of #ifeq tests, but much more efficient) {{#expr: expression}} (evaluates a given expression; see Help:Calculation for details) {{#ifexpr: expression | value if true | value if false}}
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 ...
The above example takes the conditional of Math.random() < 0.5 which outputs true if a random float value between 0 and 1 is greater than 0.5. The statement uses it to randomly choose between outputting You got Heads! or You got Tails! to the console. Else and else-if statements can also be chained after the curly bracket of the statement ...
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 code between the if and endif markup can be any HTML content that is included if the condition evaluates true or excluded otherwise. An expression can contain the name of a feature, literal values and comparison operators. Feature names include: IE – version of IE that is parsing the HTML document; WindowsEdition – edition of Windows ...