Method catch()

Method catch

mixed catch(mixed expression)

Description

Catch run time errors or other thrown values triggered by the evaluation of the expression.

Parameter expression

Expression to evaluate.

Analogous to gauge(), there are two syntaxes:

mixed err = catch(expression);

and

mixed err = catch {
      // Code block
    };

Where the latter is more versatile and more common.

Returns

Returns the value that was caught. If no value was caught 0 is returned.

Note

catch is not a function, but a special form. It is thus not valid to pass as a function.

Note also that catch does not perform any filtering of the caught values. If a caught value is not of interrest it is up to user code to re-throw the value.

See also

gauge(), throw()