From: Gabriel Saravia <gabe.saravia@...>
Date: 2009-05-07T16:02:09+09:00
Subject: Adding a =~ method to the Method class


The Ruby API specifies that objects of the Method class have an instance
method "==":  "Two method objects are equal if that are bound to the
same object and contain the same body."

At this moment, I would very much like it if it also had a "=~" method:
"two method objects are similar if they contain the same body but are
NOT necessarily bound to the same object"

unfortunately I'm not currently skilled enough to really understand the
C code in which the "==" method for the Method class is written. could
someone help me out here?  Below I've replicated the C code for the "=="
method with some changes to reflect what the =~ method would look like:

static VALUE
method_similar(method, other)
    VALUE method, other;
{
    struct METHOD *m1, *m2;

    if (TYPE(other) != T_DATA || RDATA(other)->dmark !=
(RUBY_DATA_FUNC)bm_mark)
        return Qfalse; //I Do Not understand what this if statement does
    if (CLASS_OF(method) != CLASS_OF(other))
        return Qfalse; //I assume this makes sure that the classes of
both methods is Method?

    Data_Get_Struct(method, struct METHOD, m1);//No clue but looks
harmless enough
    Data_Get_Struct(other, struct METHOD, m2); //No clue but looks
harmless enough

    if (m1->klass != m2->klass ||
        m1->rklass != m2->rklass || //this condition looks like it ALSO
checks that the classes of both methods is Method, so I must be missing
something somewhere...
        m1->recv != m2->recv || // <-!! Would all that need to happen is
this line be eliminated??
        m1->body != m2->body)
        return Qfalse;

    return Qtrue;
}


Also, how can you modify Ruby to include this function, so i can use it
in my Rails tests?

-Gabe
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