oldFunction

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oldFunction() Function

If a user-defined function redefines a standard MapTool function or another user-defined function -- for instance, a user defines a function called eval(), redefining the standard MapTool eval() -- oldFunction() can be used in the user-defined function to call the original function. When a user-defined function redefines an existing function, it keeps track of the function that it redefined. Due to this tracking, it is possible to redefine a function multiple times and oldFunction() will always reference the previous function in the chain.

Usage

oldFunction(SPECIAL)

Parameter

• SPECIAL - oldFunction supports the same parameters as the function that it is referencing.

Examples

Used within a user defined function named eval(), oldFunction() is used to call the standard eval().

[h, if ( arg(0) == 0 ), code:
{
    [h: macro.return = 0]
};{
    [h: macro.return = oldFunction( arg(0) ) ]
}]

See Also

defineFunction()