[C++-sig] const char arrays

Niall Douglas s_sourceforge at nedprod.com
Tue Aug 5 19:16:13 CEST 2003

Are const char arrays supported by boost.python?


  static const char deleteTypeName[];

Obviously we'd prefer them to become python strings. BTW MSVC7.1 here 
stops with "reference to a zero-sized array is illegal". BTW a full 
list of what boost.python doesn't support in the docs would be 
really, really useful - then I can know it's not me misconfiguring 

BTW, I've been trying to find docs on how to implement your own 
custom converters. Basically I'd like to convert a FXString to a 
python one automatically and back again. I've come up with:

namespace boost { namespace python {
PyString_FromStringAndSize(x.text(), x.length()))
}} // namespace

For the other direction I tried:

	struct FXString_rvalue_from_python
		static void init()
		static unaryfunc *get_slot(PyObject *obj)
			return (PyString_Check(obj)) ? &obj->ob_type->tp_str : 0;
		static FX::FXString extract(PyObject *intermediate)
			return FX::FXString(PyString_AsString(intermediate), 

Problem is that slot_rvalue_from_python<> in builtin_converters.hpp 
is in an unnamed namespace and so therefore is inaccessible to me :(

Furthermore, string literals in const char * form don't appear to 
cast to a FXString first as usual. Instead the compiler treats them 
as a const char *, which AFAICS Boost.python doesn't support (it 
seems to not to support any pointer to any basic type actually :( ). 
This is odd because throughout the header files it /looks/ like it 
support const literals to python strings, but it sure ain't working 
here (I get a static assertion failure in 
make_instance_impl::execute() with is_class<T>::value being value).

Any way of working around this? ie; to get const char * literals to 
become python strings? This library I'm making bindings for works 
exclusively with C style strings as its lower levels.


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