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D.2.12.16 optionIsSet

Procedure from library ring.lib (see ring_lib).

Usage:
optionIsSet( optionName )

Parameters:
optionName: a name as string of an option of interest

Return:
true, if the by optionName given option is active, false otherwise.

Example:
 
LIB "ring.lib";
// check if the option "warn" is set.
optionIsSet("warn");
==> 0
option("warn");
// now the option is set
optionIsSet("warn");
==> 1
option("nowarn");
// now the option is unset
optionIsSet("warn");
==> 0


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