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Sub::DeferredPartial 0.01

  Date Added: February 26, 2010  |  Visits: 841

Sub::DeferredPartial

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Sub::DeferredPartial is a deferred evaluation / partial application. SYNOPSIS use Sub::DeferredPartial def; $S = def sub : P1 P2 P3 { %_=@_; join , @_{qw(P1 P2 P3)} }; print $S->( P1 => 1, P2 => 2, P3 => 3 )->(); # 123 $A = $S->( P3 => 1 ); # partial application $B = $S->( P3 => 2 ); $C = $A + $B; # deferred evaluation $D = $C->( P2 => 3 ); $E = $D->( P1 => 4 ); print $E->(); # force evaluation: 863 $F = $E - $D; $G = $F->( P1 => 0 ) / 2; print $G->(); # 400 print $G; # ( ( CODE(0x15e3818): P1 => 4, P2 => 3, P3 => 1 + CODE ... $F->(); # Error: Free parameter : P1 $A->( P3 => 7 ); # Error: Bound parameter: P3 $A->( P4 => 7 ); # Error: Wrong parameter: P4 An instance of this class behaves like a sub (or, more precisely: subroutine reference), but it supports partial application and the evaluation of operators applied to such function objects is deferred too. That means, evaluation has to be forced explicitly (which makes it easier to add introspection capabilities). Objects that represent deferred (delayed, suspended) expressions are known as suspensions or thunks in various programming circles. Dont confuse with the same terms in the context of threads!.

Requirements: No special requirements
Platforms: Linux
Keyword: Deferred Deferredpartial Evaluation Libraries Partial Programming Subdeferredpartial
Users rating: 0/10

License: Freeware Size: 5.12 KB
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