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Better type checking for first-class functions
branch: master

Merge pull request #1 from zoffixznet/add_meta_provides

add provides section for latest panda (S11 support)
latest commit a3de9998d2
@moritz moritz authored



    use Typed::Subroutines;

    # create a subtype from Sub
    subset TwoArgSub         of Sub where typed_sub(Any, Any);
    subset TakesIntAndString of Sub where typed_sub(Int, Str);

    my TwoArgSub         $a;
    my TakesIntAndString $b;

    $a = sub ($a, $b) { ... }; # lives
    $a = sub ($a)     { ... }; # dies

    $b = sub (Int $a, Str $b) { ... }; # lives
    $b = sub (Int $a,     $b) { ... }; # dies

    # validate subroutines passed to your subroutines (dawg)
    sub doStuff(Int $a, Str $b, &operation where typed_sub(Int, Str)}) {

    doStuff(99, "bottles of beer", -> Int $a, Str $b { ... }) # lives
    doStuff(99, "bottles of beer", -> Rat $a, Num $b { ... }) # dies


Typed::Subroutines let you specify subroutine types verifying the parameter list so you can have better type checking for first-class functions.

I'll write more docs when I'm less tired.
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