[Swig-devel] [ swig-Bugs-1603910 ] %extend code uses "self", not "$self"

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Bugs item #1603910, was opened at 2006-11-27 17:24
Message generated for change (Comment added) made by beazley
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Category: documentation
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Steven Robbins (smr99)
Assigned to: David M. Beazley (beazley)
Summary: %extend code uses "self", not "$self"

Initial Comment:
I'm guessing this is a doc bug but it might actually be a code generation bug.

Section 6.17 Class extension describes using $self to access the "this" pointer in an extension function.  However, the generated code does not expand "$self".  One can use the bare "self" correctly, however.

Demonstration using swig 1.3.29:

$cat newsignature.i
%module test

%include std_string.i


%{
#include <stdexcept>
%}


%inline {

class Element
{
public:
    int getString( std::string& result );
};

}

%extend Element
{
    std::string getString() throw( std::runtime_error )
    {
        std::string result;
        int status = $self->getString( result );
        if ( status != 0 )
            throw std::runtime_error( "foo" );
        return result;
    }
}

$swig -c++ -java newsignature.i
$less newsignature_wrap.cxx
[...]
SWIGINTERN std::string Element_getString__SWIG_1(Element *self){
        std::string result;
        int status = $self->getString( result );
        if ( status != 0 )
            throw std::runtime_error( "foo" );
        return result;
    }



... which of course does not compile.





----------------------------------------------------------------------

>Comment By: David M. Beazley (beazley)
Date: 2006-11-27 18:58

Message:
Logged In: YES 
user_id=7557
Originator: NO

Please use self, not self.  $self first appeared in SWIG-1.3.30.


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