SWIG: std::string returned as reference - solution

Nair, Sanjay S writes:
 > 
 > I've written the following typemap to support returning string as
 > reference from c++ to perl.
 > 
 > %typemap(in) std::string*, std::string& ($basetype string_temp) {
 >      if (!SvPOK($input)) {
 >              croak("Argument $argnum is not a string");
 >      }
 >      $1 = &string_temp;
 >      argvi++;
 > }
 > 
 > %typemap(argout) std::string& OUTPUT {
 >      sv_setpv( $input, (*$1).c_str() );
 > }
 > 
 > %apply std::string& OUTPUT { std::string& };
 > 
 > I've tested it under windows OS and Active perl. This seem to work fine.
 > Any one see any issue with this implementation please let me know?
 > 

This is different than most OUTPUT typemaps which do not modify their
arguments.  Use std::string &REFERENCE if you're going to do that (to
be consistent with other typemaps that behave in the same way).

-- Dave

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