融合类型的C ++类 [英] c++ class in fused type

问题描述

我希望为一堆c ++类实现python包装器。我在pxd中某处有

I wish to implement python wrapper for a bunch of c++ classes. Somewhere in pxd I have:

cdef cppclass FooImpl1:
    FooImpl1()
    int foo()

cdef cppclass FooImpl2
    FooImpl2()
    int foo()

我想知道是否可以在pyx python包装器中编写如下内容：

I wonder if I can write something like this in pyx python wrapper:

ctypedef fused FooImpl:
    FooImpl1*
    FooImpl2*

cdef class Foo:
    cdef FooImpl impl
    def __cinit__(self, int selector):
        if selector == 1:
            self.impl = new FooImpl1()
        else:
            self.impl = new FooImpl2()

    def func(self):
        # depending on the object stored in impl FooImpl2::foo or FooImpl1::foo
        # will be called
        return self.impl.foo()

是否可以完成预期的行为？ FooImpl1和FooImpl2不共享抽象接口，它们是类的模板专业化。

Is there a way to accomplish expected behavior? FooImpl1 and FooImpl2 don't share abstract interface, they are template specializations of a class.

推荐答案

此版本（0.20）起，Cython不支持类中的融合类型，仅支持函数参数和变量。 这里是文档。

As of this version (0.20), Cython doesn't support fused types in classes, only in function parameters and variables. Here are the docs.

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