class operators/template problem with boost.python

Hello everyone,
 
i am new to Python and Boost.Python and trying to build a
python module from an existing C++ Library.
I managed to wrap some code but came to a problem exposing
operators for the following class, in example the python
__add__ method (operator+):
 
class operand{
friend operand& operator+(operand&, operand&);
template friend operand& operator+(operand& Left,
const scalar& r);
};
 
Note that the parameters are not consts. Unfortunately it
was not possible to use
 
"operand_exposer.def( bp::self * bp::self );"
 
for wrapping. From the error message i get on compiling, i
guess it doesnt know which function to use and/or needs
functions defined for each datatype i want to use with the
template:
 
error: no matching function for call to
‘operand::operand(const operand&)’
note: candidates are: ....
 
How could i get this to work? Btw. I am not able/allowed to
modify the existing C++ code. Thanks for your help.
 
Marc
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