RE: SWIG-PERL-Vector of pointers

Hi Luigi,
   Thanks for replying. If I don't use specialize, the code generated
does not contain the type information. If you write the perl code to
pass this vector, it gives the following error:

Type error in argument 3 of ItpBreakpointSLIProxy_ReadBp. Expected
_p_SBSD__BpDa
taStruct_SLI_vector at x.pl line 44.

I have the following swig code

%module SbsdSLI

%include "std_vector.i"

%template (Int_vector) std::vector<int>;
typedef std::vector<int> Int_vector; 

//namespace std {
//      specialize_std_vector(SBSD::BpDataStruct_SLI);
//}

namespace SBSD {

        struct BpDataStruct_SLI{
                long    type;
        };
        typedef std::vector<BpDataStruct_SLI> BpDataStruct_SLI_vector;

        class ItpBreakpointSLIProxy {

                int ReadBp ( const Int_vector& vReadData,
                                 BpDataStruct_SLI_vector& vReadData );
        };
};

I have the following SWIG generated code

XS(_wrap_ItpBreakpointSLIProxy_ReadBp) {
    char _swigmsg[SWIG_MAX_ERRMSG] = "";
    const char *_swigerr = _swigmsg;
    {
        SBSD::ItpBreakpointSLIProxy *arg1 = (SBSD::ItpBreakpointSLIProxy
*) 0 ;
        Int_vector *arg2 = 0 ;
        SBSD::BpDataStruct_SLI_vector *arg3 = 0 ;
        int result;
        int argvi = 0;
        dXSARGS;
        
        if ((items < 3) || (items > 3)) {
            SWIG_croak("Usage:
ItpBreakpointSLIProxy_ReadBp(self,vReadData,vReadData);");
        }
        {
            if (SWIG_ConvertPtr(ST(0), (void **) &arg1,
SWIGTYPE_p_SBSD__ItpBreakpointSLIProxy,0) < 0) {
                SWIG_croak("Type error in argument 1 of
ItpBreakpointSLIProxy_ReadBp. Expected _p_SBSD__ItpBreakpointSLIProxy");
            }
        }
        {
            if (SWIG_ConvertPtr(ST(1), (void **) &arg2,
SWIGTYPE_p_Int_vector,0) < 0) {
                SWIG_croak("Type error in argument 2 of
ItpBreakpointSLIProxy_ReadBp. Expected _p_Int_vector");
            }
        }
        {
            if (SWIG_ConvertPtr(ST(2), (void **) &arg3,
SWIGTYPE_p_SBSD__BpDataStruct_SLI_vector,0) < 0) {
                SWIG_croak("Type error in argument 3 of
ItpBreakpointSLIProxy_ReadBp. Expected
_p_SBSD__BpDataStruct_SLI_vector");
            }
        }
        result = (int)(arg1)->ReadBp((Int_vector const &)*arg2,*arg3);
        
        ST(argvi) = sv_newmortal();
        sv_setiv(ST(argvi++), (IV) result);
        XSRETURN(argvi);
        fail:
        (void) _swigerr;
    }
    croak(_swigerr);
}

if you look at the 
/* -------- TYPE CONVERSION AND EQUIVALENCE RULES (BEGIN) -------- */
section of the generated file, It generates different code for Vector of
structs and Vector of ints.

static swig_type_info _swigt__p_Int_vector[] = {{"_p_Int_vector", 0,
"Int_vector &", 0},{"_p_Int_vector"},{"_p_std__vectorTint_t"},{0}}; // 4
params


static swig_type_info _swigt__p_SBSD__BpDataStruct_SLI_vector[] =
{{"_p_SBSD__BpDataStruct_SLI_vector", 0, "SBSD::BpDataStruct_SLI_vector
&", 0},{"_p_SBSD__BpDataStruct_SLI_vector"},{0}}; // ONLY 3 params!!!

I tried to use this by writing the following perl code.

use SbsdSLI;
use strict;

my $intVector = SbsdSLI::new_Int_vector();
my $bpDataStructVector = SbsdSLI::new_BpDataStruct_SLI_vector();

$hResult = SbsdSLI::ItpBreakpointSLIProxy_ReadBp( $itpBreakpointProxy,
$intVector, $bpDataStructVector );

And this line gives
Type error in argument 3 of ItpBreakpointSLIProxy_ReadBp. Expected
_p_SBSD__BpDa
taStruct_SLI_vector at x.pl line xx.

When I use the specialize code the generated file for
BpDataStruct_SLI_vector looks as:

static swig_type_info _swigt__p_SBSD__BpDataStruct_SLI_vector[] =
{{"_p_SBSD__BpDataStruct_SLI_vector", 0, "SBSD::BpDataStruct_SLI_vector
&",
0},{"_p_SBSD__BpDataStruct_SLI_vector"},{"_p_std__vectorTSBSD__BpDataStr
uct_SLI_t"},{0}}; // 4 params

Clearly there is a difference between the generated code with and
without the specialize statement.


Is the namespace is causing any problems? 

Also, do you support Vector of pointers in SWIG? If yes, could you
please let me know how to use it?

Your help will be much appreciated.


Thanks,
-sanjay











-----Original Message-----
From: Luigi Ballabio [mailto:luigi.ballabio@xxxxxxxxxxxxx] 
Sent: Saturday, November 15, 2003 5:34 AM
To: Nair, Sanjay S
Cc: swig@xxxxxxxxxxxxxxx
Subject: Re: [Swig] SWIG-PERL-Vector of pointers

On 2003.11.15 01:55, "Nair, Sanjay S" wrote:
> Hi,
> 
> I have a structure defined and my .i file has following entries:
> 
> %module SLI
> namespace std {
>             specialize_std_vector(ABC::BpDataStruct_SLI*);
> }

Don't do this. specialize_std_vector is a macro which is only used for  
built-in types and it's an implementation detail. You shouldn't even  
know it exists---because if you did, you could instantiate it with the  
wrong number of arguments, as above, and you could get all kinds of  
weird syntax errors :)

The rest of the file looks ok to me.

Let me know if the problem persists. Also, there was a bug in SWIG  
1.3.19 which could give you problems if a vector was returned from a  
function by copy. That will be fixed in SWIG 1.3.20, soon in a website  
near you.

Hope this helps,
                        Luigi
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