c– 在boost :: python的类中公开public struct

我想用boost :: python将这个C类用于python代码

/* creature.h */class Human {private:public:    struct emotion {        /* All emotions are percentages */        char joy;        char trust;        char fear;        char surprise;        char sadness;        char disgust;        char anger;        char anticipation;        char love;    };};

问题是如何在boost-python中公开这个公共属性

namespace py = boost::python;BOOST_PYTHON_MODulE(example){    py::class_

#include 

>>> import example>>> e = example.Human.Emotion>>> e