[Cython] Bug: compilation failure with "Template parameter not a type" for pointer & reference types
Hi, I came across the following bug, while trying to implement iterator versions of std::string members, for which a simple reproducer is below. If the return type of a function is a normal type, then everything is fine, but if it's a pointer or reference type, then Cython refuses to compile it. Could something please be done about that? Many thanks! Error compiling Cython file: ... cdef extern from * nogil: cdef cppclass test: void assign[input_iterator](input_iterator, input_iterator) char assign[input_iterator](input_iterator, input_iterator) char* assign[input_iterator](input_iterator, input_iterator) char& assign[input_iterator](input_iterator, input_iterator) ^ notatype.pyx:6:35: Template parameter not a type -- Sincerely yours, Yury V. Zaytsev ___ cython-devel mailing list cython-devel@python.org https://mail.python.org/mailman/listinfo/cython-devel
Re: [Cython] Bug: compilation failure with "Template parameter not a type" for pointer & reference types
On Wed, 10 Feb 2016, Yury V. Zaytsev wrote: If the return type of a function is a normal type, then everything is fine, but if it's a pointer or reference type, then Cython refuses to compile it. I've just found out that apparently this happens because Cython misparses function definition as an array declaration, but luckily a safety check kicks in. An obvious workaround is: ctypedef char* r1 ctypedef char& r2 cdef extern from * nogil: cdef cppclass test: r1 assign[input_iterator](input_iterator, input_iterator) r2 assign[input_iterator](input_iterator, input_iterator) which compiles just fine. Unfortunately, I'm not well-versed enough with the parser to provide a patch... Hope that helps to fix the problem for good though! -- Sincerely yours, Yury V. Zaytsev ___ cython-devel mailing list cython-devel@python.org https://mail.python.org/mailman/listinfo/cython-devel
Re: [Cython] Bug: compilation failure with "Template parameter not a type" for pointer & reference types
On Wed, 10 Feb 2016, Yury V. Zaytsev wrote: Hope that helps to fix the problem for good though! Apparently a separate, but related bug: when C++ class constructor is templated, Cython fails to compile the code. However, if I specify a return type (irrespectively of what type is), it seems to work and some meaningful code is generated: cdef extern from * nogil: cdef cppclass test: test test() test test[input_iterator](input_iterator, input_iterator) Original error messages below: Error compiling Cython file: ... cdef extern from * nogil: cdef cppclass test: test() test[input_iterator](input_iterator, input_iterator) ^ notatype.pyx:9:27: undeclared name not builtin: input_iterator Error compiling Cython file: ... cdef extern from * nogil: cdef cppclass test: test() test[input_iterator](input_iterator, input_iterator) ^ notatype.pyx:9:27: Array dimension not integer Error compiling Cython file: ... cdef extern from * nogil: cdef cppclass test: test() test[input_iterator](input_iterator, input_iterator) ^ notatype.pyx:9:28: Missing name in declaration. -- Sincerely yours, Yury V. Zaytsev ___ cython-devel mailing list cython-devel@python.org https://mail.python.org/mailman/listinfo/cython-devel
