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Mini Shell
Mini Shell
U:RDoc::NormalClass[iI"Continuation:ET@I" Object;To:RDoc::Markup::Document: @parts[o;;[o: RDoc::Markup::Paragraph;[ I":Continuation objects are generated by Kernel#callcc, ;TI"<after having +require+d <i>continuation</i>. They hold ;TI"Ha return address and execution context, allowing a nonlocal return ;TI"Hto the end of the <code>callcc</code> block from anywhere within a ;TI"Cprogram. Continuations are somewhat analogous to a structured ;TI"Gversion of C's <code>setjmp/longjmp</code> (although they contain ;TI"?more state, so you might consider them closer to threads).;To: RDoc::Markup::BlankLine o; ;[I"For instance:;T@o:RDoc::Markup::Verbatim;[
I" require "continuation"
;TI":arr = [ "Freddie", "Herbie", "Ron", "Max", "Ringo" ]
;TI"callcc{|cc| $cc = cc}
;TI" puts(message = arr.shift)
;TI"&$cc.call unless message =~ /Max/
;T: @format0o; ;[I"<em>produces:</em>;T@o; ;[ I"
Freddie
;TI" Herbie
;TI" Ron
;TI" Max
;T; 0o; ;[I"/Also you can call callcc in other methods:;T@o; ;[I" require "continuation"
;TI"
;TI" def g
;TI"< arr = [ "Freddie", "Herbie", "Ron", "Max", "Ringo" ]
;TI" cc = callcc { |cc| cc }
;TI" puts arr.shift
;TI" return cc, arr.size
;TI" end
;TI"
;TI" def f
;TI" c, size = g
;TI" c.call(c) if size > 1
;TI" end
;TI"
;TI"f
;T; 0o; ;[I"HThis (somewhat contrived) example allows the inner loop to abandon ;TI"processing early:;T@o; ;[I" require "continuation"
;TI"callcc {|cont|
;TI" for i in 0..4
;TI" print "\n#{i}: "
;TI" for j in i*5...(i+1)*5
;TI"" cont.call() if j == 17
;TI" printf "%3d", j
;TI"
end
;TI" end
;TI"}
;TI"
puts
;T; 0o; ;[I"<em>produces:</em>;T@o; ;[ I"0: 0 1 2 3 4
;TI"1: 5 6 7 8 9
;TI"2: 10 11 12 13 14
;TI"3: 15 16;T; 0:
@fileI" cont.c;T:0@omit_headings_from_table_of_contents_below0;
0;0[ [ [ [[I"
class;T[[: public[ [:protected[ [: private[ [I"
instance;T[[;[[I"[];TI" cont.c;T[I" call;T@m[;[ [;[ [ [U:RDoc::Context::Section[i 0o;;[ ;
0;0[@X@XcRDoc::TopLevel
Zerion Mini Shell 1.0