override virtual method which returns nested template type

[bsdz]

I'm having trouble compiling the following code with a member function that returns a nested template type (vector of tuples). I'm using g++-13 with c++23 mode.

#include <pybind11/pybind11.h>
#include <pybind11/stl.h>

#include <memory>
#include <string>
#include <tuple>
#include <vector>

namespace py = pybind11;

using namespace std;

class A {
   public:
    virtual ~A() = default;
    virtual vector<tuple<string, int>> fields() = 0;
};

class PyA : public A {
   public:
    using A::A;

    vector<tuple<string, int> > fields() override {
        PYBIND11_OVERRIDE_PURE(vector<tuple<string, int> >, A, fields);
    };
};

PYBIND11_MODULE(example, m) {
    py::class_<A, PyA, shared_ptr<A>>(m, "A");
}

If I don't place white spaces between the ">>" template closing brackets (in trampoline class), I get an error "expected ‘>’ before ‘>>’ token". Otherwise, I get an error "expected ‘(’ before ‘>’ token".

Does anyone have any suggestions on how I might be able to mimic this return type using pybind?

[bsdz]

Actually, this is an issue with the macro expansion. The macro is confused by the comma in the template definition. If I expand the macro manually but as intended then the code compiles, i.e.

        PYBIND11_OVERRIDE_PURE_NAME(PYBIND11_TYPE(vector<tuple<string, int>>),
                                    PYBIND11_TYPE(A), "fields", fields);

There some other possible workarounds here (none look pretty).