SGScript - basic C++ binding [WIP]

#include <stdio.h>
#include <string>

#include "cppbind.h"


class Account
{
public:
    int coins;
    int numtransactions;
    std::string name;

    Account() : coins( 0 ), numtransactions( 0 ){}

    int Add( SGS_CTX )
    {
        int orig = coins;
        sgs_Integer I;
        if( sgs_StackSize( C ) != 2 ||
            !sgs_ParseInt( C, 1, &I ) )
            return sgs_Printf( C, SGS_WARNING, "unexpected arguments" );
        coins += (int) I;
        numtransactions++;
        printf( "Transaction #%04d | before=%d after=%d\n",
            numtransactions, orig, coins );
        return 0;
    }
};

SGS_DECLARE_IFACE( Account );
SGS_METHOD_WRAPPER( Account, Add );
SGS_BEGIN_GENERIC_GETINDEXFUNC( Account )
    SGS_GGIF_METHOD( Account, Add )
    SGS_GGIF_CUSTOM( Account, coins, sgs_PushInt(C,item->coins) )
    SGS_GGIF_CUSTOM( Account, name, sgs_PushString(C,item->name.c_str()) )
    SGS_GGIF_CUSTOM( Account, transaction_count, sgs_PushInt(C,item->numtransactions) )
SGS_END_GENERIC_GETINDEXFUNC;
SGS_BEGIN_GENERIC_SETINDEXFUNC( Account )
    SGS_GSIF_CUSTOM( Account, name,
        char* str; sgs_SizeVal strlen;
        if( !sgs_ParseString( C, 1, &str, &strlen ) )
            return SGS_EINVAL;
        item->name.assign( str, strlen );
    )
SGS_END_GENERIC_SETINDEXFUNC;
SGS_GENERIC_DESTRUCTOR( Account );
SGS_DEFINE_IFACE( Account )
    SGS_IFACE_ENTRY( GETINDEX, SGS_GETINDEXNAME( Account ) ),
    SGS_IFACE_ENTRY( SETINDEX, SGS_SETINDEXNAME( Account ) ),
    SGS_IFACE_ENTRY( DESTRUCT, SGS_DTORNAME( Account ) ),
SGS_DEFINE_IFACE_END;
SGS_DEFINE_EMPTY_CTORFUNC( Account );


const char* code =
"\n\
a = Account();\n\
a.Add( 1337 );\n\
print 'reading from property: ' $ a.coins $ '\\n';\n\
a.name = 'special';\n\
printvars( a.name, a.transaction_count, a.coins );\n\
";

int main( int argc, char* argv[] )
{
    printf( "CPP binding test...\n" );

    SGS_CTX = sgs_CreateEngine();

    SGS_REGISTER( Account );

    sgs_ExecString( C, code );

    sgs_DestroyEngine( C );

    return 0;
}