Functions - SQF: Difference between revisions

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'''Description:'''
#REDIRECT [[Function]]
 
While Sqs [[Script syntax|script syntax]] is line based, functions (see [[call]], [[execVM]], [[compile]], [[then]], [[do]]) are based on structured expressions and end-of-line has no special meaning, it is considered to be equivalent to space or semicolon and is therefore required even when ending line.
 
'''''Note:''' Sqs Scripts can do some things that are not possible in functions. Scripts can wait suspended until some condition is met, they can also use goto to change execution point at any time.''
 
Starting with Armed Assault even function based [[Script|scripts]] can wait suspended using [[sleep]] or [[waitUntil]]. While '''SQS scripts''' still work, they '''are considered deprecated''' and wherever possible, structured syntax should be used instead.''
 
Main language contructs used in functions are:
*[[if]]..[[then]]..[[else]]
*[[while]]..[[do]]
*Curled braces
*Multiple commands (including assigment commands) are delimited with a semicolon.
 
 
Result of the last expression evaluated is returned as a function result.
 
This can be nothing when a function returns no value.
 
 
<b>Example 1</b> (max.sqf)
 
comment "Return maximum of first and second argument";
[[private variableNameList|private]] {"_a","_b"};
_a = _this [[select]] 0;
_b = _this [[select]] 1;
if (_a>_b) [[then]] {_a} [[else]] {_b}
 
 
<b>Example 2</b> (infantrySafe.sqf)
 
comment "Switch all infantry units to safe mode";
{
  [[if]] ([[vehicle]] _x == _x) [[then]]
  {
  _x [[setBehaviour]] "safe"
  }
} [[forEach]] _this
 
 
Due to line-based nature of Sqs scripts it is not possible to create multiline string constants in them.<br>
To overcome this limitation you can store multiline in separate files and load them using [[loadFile]] or [[preprocessFile]] functions (the second uses C-like preprocessor with // or /* */ comments and #define macros).<br>
Recommended file extension for functions is '''.SQF''' (as opposed to '''.SQS''' used for scripts).
 
 
[[Category: Scripting_Topics ]]

Latest revision as of 13:29, 24 July 2006

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