Chain - Revision history

Ximan: /* Description */

2010-12-19T00:01:11Z

‎Description

Ximan: /* Description */

2010-12-18T23:40:52Z

‎Description

Ximan: Created page with "== Calling Pattern == Call local c = sl.chain(a,b[,...]) Args a is a function b1..bN are functions Results c is a chain closure == Alternative Calling Pattern == Call local..."

2010-12-18T23:39:17Z

Created page with "== Calling Pattern == Call local c = sl.chain(a,b[,...]) Args a is a function b1..bN are functions Results c is a chain closure == Alternative Calling Pattern == Call local..."

New page

== Calling Pattern ==
Call
local c = sl.chain(a,b[,...])
Args
a is a function
b1..bN are functions
Results
c is a chain closure

== Alternative Calling Pattern ==
Call
local c = sl.chain(a,t)
Args
a is a function
t is a table of functions with one-based, contiguous numeric keys
Results
c is a chain closure

== Closure Methods ==

* [[chain.dispose]]
* [[chain.initiate]]

== Example Usage ==

local b01 = function(n,a,b,c)
print(n)
return true
end
local b02 = function(a,b,c)
print(a..' '..b..' '..c)
return string.char(string.byte(a)+1), string.char(string.byte(b)+1), string.char(string.byte(c)+1)
end
local b05 = {b02,b02,b02}
local b00 = sl.chain(b01,b05)
local b03, b04 = b00.init('a','b','c')
print(b03)
print(b04)
b00.dispose()

--> a b c
1
b c d
2
c d e
3
3

== Description ==

Calling chain returns a chain closure with two defined methods, [[chain.dispose|dispose]] and [[chain.initiate|initiate]]. The first argument, a, is the monitoring function, and the remaining functions (or a table of functions) make up the body of the execution chain.

Functions passed as the b arguments to chain are called in turn and their results are passed to the a function. If a returns true, the next argument in the chain is executed.

== Upon Error ==

If none of the described argument patterns are matched, an error is reported and handled according to the operant error redirection mode.

== See Also ==

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

* [[case]]
* [[iterator]]
* [[machine]]
* [[spin]]

@@ Line 51: / Line 51: @@
 Calling chain returns a chain closure with two defined methods, [[chain.dispose|dispose]] and [[chain.initiate|initiate]].  The first argument, a, is the monitoring function, and the remaining functions (or a table of functions) make up the body of the execution chain.
-Functions passed as the b arguments to chain are called in turn and their results are passed to the a function.  If a returns true, the next argument in the chain is executed.  See the [[chain.initiate|initiate]] method for more details.
+Upon initialization, functions passed as the b arguments to chain are called in turn and their results are passed to the a function.  If a returns true, the next argument in the chain is executed.  See the [[chain.initiate|initiate]] method for more details.
 == Upon Error ==