Exceptions/Catch an exception thrown in a nested call: Difference between revisions
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through the nested function calls together with the name of the |
through the nested function calls together with the name of the |
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uncaught exception, (U1) to stderr, then quit the running program. |
uncaught exception, (U1) to stderr, then quit the running program. |
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=={{header|Quackery}}== |
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<lang Quackery> [ this ] is U0 |
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[ this ] is U1 |
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[ 0 = iff U0 else U1 |
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message put bail ] is baz ( n --> ) |
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[ baz ] is bar ( n --> ) |
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[ 2 times |
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[ i^ |
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1 backup |
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bar |
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bailed if |
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[ message share |
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U0 oats iff |
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[ say "Exception U0 raised." cr |
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echostack |
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$ "Press enter to continue" |
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input drop |
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message release |
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drop ] |
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else [ drop bail ] ] ] ] is foo</lang> |
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{{out}} |
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Testing in the Quackery shell, first with trapping the exception U1, and then without trapping the exception U1 (this is bad practice). Before invoking <code>foo</code> we put some arbitrary data on the stack to show if and how it is affected. |
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<pre>/O> 111 222 333 |
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... |
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Stack: 111 222 333 |
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/O> 0 backup foo bailed if [ message take echo ] |
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... |
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Exception U0 raised. |
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Stack: 111 222 333 0 |
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Press enter to continue |
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U1 |
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Stack: 111 222 333 |
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/O> foo |
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... |
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Exception U0 raised. |
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Stack: 111 222 333 0 |
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Press enter to continue |
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Problem: Cannot remove an immovable item. |
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Quackery Stack: 111 222 333 |
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Return stack: {[...] 0} {quackery 1} {[...] 11} {shell 5} {quackery 1} {[...] 0} {foo 2} {times 6} |
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{[...] 10} {[...] 6} {[...] 7} {[...] 1} {bail 1} |
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/O> |
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Stack empty. |
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</pre> |
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=={{header|R}}== |
=={{header|R}}== |
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