when

Statement macro

Summary

Executes an implicit body if a test expression is true, and does nothing if the test is false.

Macro call

when (test) [ consequent ] end [ when ]
Arguments

 
test
 A Dylan expressionbnf.
 
consequent
 A Dylan bodybnf.

Values

 
Zero or more instances of <object>.


Library
common-extensions
Module
common-extensions
Description
 Executes consequent if test is true, and does nothing if test is false.
 This macro behaves identically to Dylan's standard if statement macro, except that there is no alternative flow of execution when the test is false. 
Example
when (x < 0)
  ~ x;
end;

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Common Dylan and Functional Extensions - 31 Mar 00