Difference between revisions of "FUNCTION EXISTS()"
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==Purpose== | ==Purpose== | ||
Function to check whether a function has been declared | Function to check whether a function has been declared | ||
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==Syntax== | ==Syntax== | ||
FUNCTION_EXISTS(<expC>) | FUNCTION_EXISTS(<expC>) | ||
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==See Also== | ==See Also== | ||
| − | [[ENDFUNC]], [[FUNCTION]], [[ISSET()]], [[PROCEDURE]], [[RETURN]], [[TYPE()]], [[UNSET()]], [[VARTYPE()]] | + | [[CLASS EXISTS()]], [[ENDFUNC]], [[FUNCTION]], [[IS_FUNCTION()]], [[ISSET()]], [[PEXIST()]], [[PROCEDURE]], [[RETURN]], [[SET LIBRARY]], [[SET PROCEDURE]], [[TYPE()]], [[UNSET()]], [[VARTYPE()]] |
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==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. | 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. | ||
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==Example== | ==Example== | ||
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endif | endif | ||
</code> | </code> | ||
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[[Category:Documentation]] | [[Category:Documentation]] | ||
[[Category:Functions]] | [[Category:Functions]] | ||
| − | [[Category: | + | [[Category:User Defined Functions]] |
| − | [[Category: | + | [[Category:Libraries]] |
| + | [[Category:Lianja VFP Extensions]] | ||
| + | [[Category:VFP Function Extensions]] | ||
Latest revision as of 10:31, 16 May 2022
Contents
Purpose
Function to check whether a function has been declared
Syntax
FUNCTION_EXISTS(<expC>)
See Also
CLASS EXISTS(), ENDFUNC, FUNCTION, IS_FUNCTION(), ISSET(), PEXIST(), PROCEDURE, RETURN, SET LIBRARY, SET PROCEDURE, 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
