const fails when used as the argument to a template of a template

[robertwb]

This works:

from libcpp.vector cimport vector

cdef extern from "Test.hpp":
    cdef vector[char](const) f()

As does this:

from libcpp.vector cimport vector

cdef extern from "Test.hpp":
    cdef vector[f()

But this causes a Cython parse error on Cython 0.18:

from libcpp.vector cimport vector

cdef extern from "Test.hpp":
    cdef vector[vector[const char](vector[char]])] f()

Migrated from http://trac.cython.org/ticket/798

[robertwb]

garrison changed cc to garrison
commented

[scoder]

The obvious work-around is a ctypedef, but it seems worth fixing.

The parser calls p_buffer_or_template() to parse the […] part, which then calls p_positional_and_keyword_args() to parse what's inside of the brackets. I guess that simply doesn't allow template type declarations. It could, though. That would probably also help with template type parsing in function signatures.

Also needs a test, probably in one of the tests/run/cpp_*.pyx modules.

[shwina]

Taking a look