ERR - Revision history

Ximan at 18:18, 24 November 2010

2010-11-24T18:18:31Z

Ximan: /* Description */

2010-11-02T23:47:41Z

‎Description

Ximan: /* See Also */

2010-11-02T16:29:30Z

‎See Also

Ximan: /* Description */

2010-11-02T04:18:17Z

‎Description

Ximan: /* Description */

2010-11-02T04:16:22Z

‎Description

Ximan: Created page with "== Description == ERR is a unique library defined value that is employed in place of nil in certain areas. It's best to pull ERR into the global environment if needed to any..."

2010-11-02T04:13:32Z

Created page with "== Description == ERR is a unique library defined value that is employed in place of nil in certain areas. It's best to pull ERR into the global environment if needed to any..."

New page

== Description ==

ERR is a unique library defined value that is employed in place of [[nil]] in certain areas. It's best to pull ERR into the global environment if needed to any degree. The type returned by [[type]](ERR) is 'table', so it should be explicitly tested against if it is an expected return value. ERR only comes into play if inlined error redirection has been selected.

local sl = dofile(getinstalldir()..'/lib/simplelib.lua')
ERR = sl.ERR
sl.slredirect('i') -- enable inline error handling
local td = sl.testdummy(1) -- library test object
local a,b = td.go(3) -- raise a runtime error
print(tostring(a == ERR)..' '..b)

--> 'true 1'

== See Also ==

* [[nil]]

* [[null]]

* [[non]]

* [[slredirect]]

* [[try]]

* [[type]]

← Older revision		Revision as of 18:18, 24 November 2010
Line 17:		Line 17:

	* [http://www.easyuo.com/openeuo/wiki/index.php/Simplelib simplelib]		* [http://www.easyuo.com/openeuo/wiki/index.php/Simplelib simplelib]
		+
		+	* [[EOF]]

	* [[nil]]		* [[nil]]

@@ Line 10: / Line 10: @@
   print(tostring(a == ERR)..' '..b)
-  --> 'true 1'
+  --> true 1
 If the 'i' flag has been set via [[slredirect]], then detected errors are inlined as an (ERR,eref) [[tuple]], where eref is a number that can be passed to [[geterror]] to return the recorded error table.  Inlined errors can alternatively be returned as ([[nil]],eref) pairs, see [[slredirect]] for more information.

@@ Line 12: / Line 12: @@
   --> 'true 1'
-If the 'i' flag has been set via [[slredirect]], then detected errors are inlined as an (ERR,eref) [[tuple]], where eref is a number that can be passed to [[geterror]] to return the recorded error table.
+If the 'i' flag has been set via [[slredirect]], then detected errors are inlined as an (ERR,eref) [[tuple]], where eref is a number that can be passed to [[geterror]] to return the recorded error table.  Inlined errors can alternatively be returned as ([[nil]],eref) pairs, see [[slredirect]] for more information.
 == See Also ==

← Older revision		Revision as of 04:16, 2 November 2010
Line 11:		Line 11:

	--> 'true 1'		--> 'true 1'
		+
		+	If the 'i' flag has been set via [[slredirect]], then detected errors are inlined as an (ERR,eref) [[tuple]], where eref is a number that can be passed to [[geterror]] to return the recorded error table.

	== See Also ==		== See Also ==

@@ Line 15: / Line 15: @@
 == See Also ==
 * [[nil]]
 * [[non]]
 * [[slredirect]]