# mode: run
# tag: cpp

"""
PYTHON setup.py build_ext --inplace
PYTHON -c "from assignment_overload import test; test()"
"""

######## setup.py ########

from distutils.core import setup
from Cython.Build import cythonize
setup(ext_modules=cythonize("*.pyx", language='c++'))


######## assign.cpp ########

class wrapped_int {
public:
  long long val;
  wrapped_int() { val = 0; }
  wrapped_int(long long val) { this->val = val; }
  wrapped_int &operator=(const wrapped_int &other) {
    this->val = other.val;
    return *this;
  }
  wrapped_int &operator=(const long long val) {
    this->val = val;
    return *this;
  }
};


######## assign.pxd ########

cdef extern from "assign.cpp" nogil:
    cppclass wrapped_int:
        long long val
        wrapped_int()
        wrapped_int(long long val)
        wrapped_int& operator=(const wrapped_int &other)
        wrapped_int& operator=(const long long &other)


######## assignment_overload.pyx ########

from assign cimport wrapped_int

def test():
    cdef wrapped_int a = wrapped_int(2)
    cdef wrapped_int b = wrapped_int(3)
    cdef long long c = 4

    assert &a != &b
    assert a.val != b.val

    a = b
    assert &a != &b
    assert a.val == b.val
    a = c
    assert a.val == c

    a, b, c = 2, 3, 4
    a = b = c
    assert &a != &b
    assert a.val == b.val
    assert b.val == c
