Re: [Caml-list] install_printer

[Ian Zimmerman <itz@speakeasy.org>]

itz> Hi, I can hook into the toplevel loop to modify printing of simple
itz> types like int with #install_printer, but what about polymorphic
itz> types?

Daniel> For a general printing of all values of all types, use the hook
Daniel> Toploop.print_out_value. You can change it to point to your function.

Daniel> This function must take a value of type Outcometree.out_value and
Daniel> print it. The module Outcometree is in the installed OCaml library
Daniel> directory.

Daniel> The default value of !Toploop.print_out_value is the function "print_outval"
Daniel> located in the OCaml sources file toplevel/genprintval.ml. You can make your
Daniel> own version by copying this function and adapt it for your own usage.

Daniel> Another example is the "revised syntax" of Camlp4 in the OCaml
Daniel> sources, file "camlp4/top/rprint.ml". (use "camlp4r pr_o.cmo
Daniel> camlp4/top/rprint.ml" to see this file in normal syntax, if you
Daniel> prefer).

Thanks.  I take it that your answer is 3.04 specific; actually I am
working with 3.02.  I will just wait with this functionality until I
upgrade. 

Pretty amazing that it _is_ now possible, really. :-)  Maybe because
you needed something like it for p4?

-- 
Ian Zimmerman, Oakland, California, U.S.A.
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In his own soul a man bears the source
from which he draws all his sorrows and his joys.
Sophocles.
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