Re: [C#] Discarding overloads using typecheck

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On Sat, 31 Aug 2024 at 07:13, Rokas Kupstys via Swig-user <
[email protected]> wrote:

> Hi,
>
> Does anyone know how to have SWIG automatically discard overloads of
> compatible types? For example, we get this behavior for "const char*"
> and "std::string", where functions differing only with these types of
> corresponding parameters are treated as same. std_string.i has
> "%typemap(typecheck) string = char *;" which i thought is responsible
> for discarding overloads. I added typemaps for string_view, but
> "%typemap(typecheck) std::string_view = char *;" does not work. I also
> am dealing with two STL libraries - standard one and EASTL, so i need to
> treat types from both libraries as equal as well. All these types should
> be considered as strings: std::string, std::string_view, eastl::string,
> eastl::string_view, const char* (and corresponding const-ref variants,
> omitted for brevity). I know i can ignore those functions, but this
> would be very tedious, i would rather use a built in mechanism to
> discard these overloads. Please advice.
>

 The typecheck typemaps should work as you expect. Maybe you've done
something unexpected like not declaring the typemaps before the types are
parsed or there is a namespace issue.

Try the -debug-tmsearch option, eg you should see something like this for
simple usage:

%include <std_string.i>
%inline %{
void abc(const std::string& s) {}
void abc(const char* s) {}
%}

example.i:6: Searching for a suitable 'typecheck' typemap for: std::string
const &s
  Looking for: std::string const &s
  Looking for: std::string const &
  Using: %typemap(typecheck) std::string const & = char *

and the automated ignore you want with a warning (this is the C# output,
I'm not sure what language(s) you are using)...

example.i:7: Warning 516: Overloaded method abc(char const *) ignored,
example.i:6: Warning 516: using abc(std::string const &) instead.

William

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<div dir=3D"ltr"><div dir=3D"ltr"><br></div><br><div class=3D"gmail_quote">=
<div dir=3D"ltr" class=3D"gmail_attr">On Sat, 31 Aug 2024 at 07:13, Rokas K=
upstys via Swig-user &lt;<a href=3D"mailto:[email protected]"=
>[email protected]</a>&gt; wrote:<br></div><blockquote class=
=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rg=
b(204,204,204);padding-left:1ex">Hi,<br>
<br>
Does anyone know how to have SWIG automatically discard overloads of <br>
compatible types? For example, we get this behavior for &quot;const char*&q=
uot; <br>
and &quot;std::string&quot;, where functions differing only with these type=
s of <br>
corresponding parameters are treated as same. std_string.i has <br>
&quot;%typemap(typecheck) string =3D char *;&quot; which i thought is respo=
nsible <br>
for discarding overloads. I added typemaps for string_view, but <br>
&quot;%typemap(typecheck) std::string_view =3D char *;&quot; does not work.=
 I also <br>
am dealing with two STL libraries - standard one and EASTL, so i need to <b=
r>
treat types from both libraries as equal as well. All these types should <b=
r>
be considered as strings: std::string, std::string_view, eastl::string, <br=
>
eastl::string_view, const char* (and corresponding const-ref variants, <br>
omitted for brevity). I know i can ignore those functions, but this <br>
would be very tedious, i would rather use a built in mechanism to <br>
discard these overloads. Please advice.<br></blockquote><div><br></div><div=
>=C2=A0The typecheck typemaps should work as you expect. Maybe you&#39;ve d=
one something unexpected like not declaring the typemaps before the types a=
re parsed or there is a namespace issue.</div><div><br></div><div>Try the -=
debug-tmsearch option, eg you should see something like this for simple usa=
ge:<br></div><div><br></div><div>%include &lt;std_string.i&gt;<br>%inline %=
{<br>void abc(const std::string&amp; s) {}<br>void abc(const char* s) {}<br=
>%}<br></div><div><br></div><div>example.i:6: Searching for a suitable &#39=
;typecheck&#39; typemap for: std::string const &amp;s<br>=C2=A0 Looking for=
: std::string const &amp;s<br>=C2=A0 Looking for: std::string const &amp;<b=
r>=C2=A0 Using: %typemap(typecheck) std::string const &amp; =3D char *</div=
><div><br></div><div>and the automated ignore you want with a warning (this=
 is the C# output, I&#39;m not sure what language(s) you are using)...<br><=
/div><div><br></div><div>example.i:7: Warning 516: Overloaded method abc(ch=
ar const *) ignored,<br>example.i:6: Warning 516: using abc(std::string con=
st &amp;) instead.</div><div><br></div><div>William<br></div></div></div>

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