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Annotation of 43BSD/contrib/icon/man/man2/pdco.2, revision 1.1.1.1

1.1       root        1: .so tmac.ilib
                      2: .TH PDCO 2 "The University of Arizona \- 8/16/84"
                      3: .SH NAME
                      4: pdco \- programmer-defined control operations
                      5: .SH DESCRIPTION
                      6: These procedures are taken mainly from TR 82-8, which describes
                      7: how co-expressions can be used to model the built-in control
                      8: structures of Icon and also provide new ones. Some procedures have
                      9: been corrected or improved and there are additions.
                     10: .SH SYNOPSIS
                     11: .nf
                     12: .ta 2.0i
                     13: \*MAlt\^{e1,\*be2}\fR  models \*Me1 | e2\fR
                     14: \*MColseq\^{e1,\*be2, \*(El}\fR        produces results of \*Me1\fR, \*Me2\fR, \*(El alternately
                     15: \*MComseq\^{e1,\*be2}\fR       compares result sequences of \*Me1\fR and \*Me2\fR
                     16: \*MCond\^{e1,\*be2, \*(El}\fR  generalized Lisp conditional
                     17: \*MEvery\^{e1,\*be2}\fR        models \*Mevery e1 do e2\fR
                     18: \*MGalt\^{e1,\*be2, \*(El}\fR  generalized alternation: \*Me1 | e2 | \*(El\fR
                     19: \*MLcond\^{e1,\*be2, \*(El}\fR Lisp conditional
                     20: \*MLimit\^{e1,\*be2}\fR        models \*Me1 \e e2\fR
                     21: \*MRanseq\^{e1,\*be2, \*(El}\fR        produces results of \*Me1\fR, \*Me2\fR, \*(El at random
                     22: \*MRepalt\^{e}\fR      models \*M|e\fR
                     23: \*MResume\^{e1,\*be2,\*be3}\fR models \*Mevery e1 \e e2 do e3\fR
                     24: \*MSelect\^{e1,\*be2}\fR       produces results from \*Me1\fR by position according to \*Me2\fR
                     25: .SH BUGS AND DEFICIENCIES
                     26: Because of the handling of the scope of local identifiers in co-expressions,
                     27: expressions in programmer-defined control operations cannot communicate
                     28: through local identifiers. The results produced by programmer-defined
                     29: control operations are always dereferenced. Some constructions, such
                     30: as \*Mbreak\fR and \*Mreturn\fR, cannot be used in arguments to programmer-defined
                     31: control operations. See TR 82-8 for details of these problems.
                     32: .SH REQUIREMENTS
                     33: \fIPdco\fR requires the experimental extensions in Version 5.9 of Icon.
                     34: .SH SEE ALSO
                     35: pdae(2)
                     36: .PP
                     37: .Pd
                     38: .PP
                     39: .Ex
                     40: .SH AUTHORS
                     41: Ralph E. Griswold and Michael Novak

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