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v2_6_3 - Show latest stable - 0 notes - Class: Proc

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2_6_3 (0)
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<<(p1) public

Returns a proc that is the composition of this proc and the given g. The returned proc takes a variable number of arguments, calls g with them then calls this proc with the result.

f = proc {|x| x * x }
g = proc {|x| x + x }
p (f << g).call(2) #=> 16

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static VALUE
proc_compose_to_left(VALUE self, VALUE g)
{
    VALUE proc, args, procs[2];
    rb_proc_t *procp;
    int is_lambda;

    procs[0] = self;
    procs[1] = g;
    args = rb_ary_tmp_new_from_values(0, 2, procs);

    GetProcPtr(self, procp);
    is_lambda = procp->is_lambda;

    proc = rb_proc_new(compose, args);
    GetProcPtr(proc, procp);
    procp->is_lambda = is_lambda;

    return proc;
}

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