Cython: '+' 的操作数类型无效(btVector3；btVector3)

Question

子弹.pxd:

cdef extern from "bullet/LinearMath/btVector3.h":
    cdef cppclass btVector3:
        btVector3(float, float, float) except +
        btVector3 operator+(const btVector3&, const btVector3&)

btmath.pyx:

cimport bullet as bt

cdef class Vector:

    cdef bt.btVector3* _this

    def __cinit__(self, float x=0, float y=0, float z=0):

        self._this = new bt.btVector3(x, y, z)


    def __add__(Vector self, Vector other):

        vec = Vector()
        del vec._this
        vec._this[0] = self._this[0] + other._this[0]

        return vec

btVector3.h中operator+的原型(prototype):

SIMD_FORCE_INLINE btVector3 
operator+(const btVector3& v1, const btVector3& v2);

如标题所述，我得到“'+'无效的操作数类型(btVector3；btVector3)”。我猜这可能与 Cython 如何处理引用传递有关？

任何帮助将不胜感激。

Answer 1

事实证明，在这种情况下，Cython 将“this”参数视为隐式参数，因此bullet.pxd 应如下所示:

cdef extern from "bullet/LinearMath/btVector3.h":
    cdef cppclass btVector3:
        btVector3(float, float, float) except +
        btVector3 operator+(btVector3)

非常感谢 Robert Bradshaw 帮助我解决了这个问题:https://groups.google.com/forum/#!topic/cython-users/8LtEE_Nvf0o