cython问题：'bool'不是类型标识符 [英] cython issue: 'bool' is not a type identifier

问题描述

我拼命试图将 std :: vector< bool> 类成员公开给Python类。

I'm desperately trying to expose a std::vector<bool> class member to a Python class.

这是我的C ++类：

class Test
{
  public:
    std::vector<bool> test_fail;
    std::vector<double> test_ok;
};

访问和转换 test_ok 键入 double （或int，float，..）有效，但不适用于 bool ！

While the access and conversion of test_ok of type double (or int, float, ..) works, it does not for bool!

这是我的Cython类：

Here is my Cython class:

cdef class pyTest:
     cdef Test* thisptr
     cdef public vector[bool] test_fail
     cdef public vector[double] test_ok

     cdef __cinit__(self):
         self.thisptr = new Test()
         self.test_fail = self.thisptr.test_fail # compiles and works if commented
         self.test_ok = self.thisptr.test_ok

     cdef __dealloc__(self):
         del self.thisptr

我得到的错误是：

Error compiling Cython file:
------------------------------------------------------------
...




cdef extern from *:
    ctypedef bool X 'bool'
            ^
------------------------------------------------------------

vector.from_py:37:13: 'bool' is not a type identifier

我正在使用python 2.7.6和Cython 0.20.2（也尝试使用0.20.1）。

I'm using python 2.7.6 and Cython 0.20.2 (also tried 0.20.1).

我也尝试过使用房地产，但是它也不起作用。

I also tried with properties but it does not work either.

附录：我在pyx文件的顶部确实有来自libcpp cimport bool 以及矢量导入。

Addendum: I do have the from libcpp cimport bool at the top of my pyx file, as well as the vector import.

怎么了？我相信这可能是一个错误。有人知道该如何规避吗？谢谢。

What's wrong ?? I believe this might be a bug. Anyone knows how to circumvent this ? Thanks.

推荐答案

我发现了一个有效的解决方法，尽管它可能不是最佳选择。

I have found a valid workaround, although it may not be optimal.

我用python列表替换了 pytest 类的成员类型。

I have replaced the members types of the pytest class with python lists.

现在隐式完成了转换，如文档中所述： http://docs.cython.org/src/userguide/wrapping_CPlusPlus.html#standard-library

The conversion is now done implicitely, as described in the documentation: http://docs.cython.org/src/userguide/wrapping_CPlusPlus.html#standard-library

所有转换都会创建一个新容器并将数据复制到其中。容器中的项目会自动转换为相应的类型，包括递归转换容器内部的容器，例如

All conversions create a new container and copy the data into it. The items in the containers are converted to a corresponding type automatically, which includes recursively converting containers inside of containers, e.g. a C++ vector of maps of strings.

所以现在，我的课看起来像这样：

So now, my class looks like this:

cdef class pyTest:
     cdef Test* thisptr
     cdef public list test_fail #now ok
     cdef public list test_ok

     cdef __cinit__(self):
         self.thisptr = new Test()
         self.test_fail = self.thisptr.test_fail # implicit copy & conversion
         self.test_ok = self.thisptr.test_ok # implicit copy and conversion

     cdef __dealloc__(self):
         del self.thisptr

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