Difference between revisions of "FUNCTION EXISTS()"

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{{YLM to do}}
 
 
==Class==
 
 
 
 
 
==Purpose==
 
==Purpose==
 
+
Function to check whether a function has been declared
  
  
 
==Syntax==
 
==Syntax==
 
+
FUNCTION_EXISTS(<expC>)
  
  
 
==See Also==
 
==See Also==
 
+
[[ENDFUNC]], [[FUNCTION]], [[ISSET()]], [[PROCEDURE]], [[RETURN]], [[TYPE()]], [[UNSET()]], [[VARTYPE()]]
  
  
 
==Description==
 
==Description==
 
+
The FUNCTION_EXISTS() function can be used to check whether a function has been declared.  FUNCTION_EXISTS() will return .T. (true) if the function named <expC> has been declared and .F. (false) if it has not been declared.  Functions are declared using the [[FUNCTION]] or [[PROCEDURE]] commands.
  
  
 
==Example==
 
==Example==
 
<code lang="recital">
 
<code lang="recital">
 +
function add18
 +
parameter dob
 +
return gomonth(dob,18*12)
  
 +
if function_exists('add18')
 +
    attainmajority = add18(date())
 +
endif
 
</code>
 
</code>
  
 
==Products==
 
==Products==
 +
Recital, Recital Server
  
 
[[Category:Documentation]]
 
[[Category:Documentation]]
 
[[Category:Functions]]
 
[[Category:Functions]]
 +
[[Category:Applications]]
 +
[[Category:Applications Functions]]

Latest revision as of 14:55, 3 November 2009

Purpose

Function to check whether a function has been declared


Syntax

FUNCTION_EXISTS(<expC>)


See Also

ENDFUNC, FUNCTION, ISSET(), PROCEDURE, RETURN, TYPE(), UNSET(), VARTYPE()


Description

The FUNCTION_EXISTS() function can be used to check whether a function has been declared. FUNCTION_EXISTS() will return .T. (true) if the function named <expC> has been declared and .F. (false) if it has not been declared. Functions are declared using the FUNCTION or PROCEDURE commands.


Example

function add18
parameter dob
return gomonth(dob,18*12)
 
if function_exists('add18')
    attainmajority = add18(date())
endif

Products

Recital, Recital Server