pybind11和复杂类型的转换

如何解决pybind11和复杂类型的转换

我正在将代数系统从boost / python转移到pybind11，大多数系统工作正常，只需要简单的修改即可。该系统还实现了其类型的复杂版本，其中实部和虚部不是数字类型（认为是多项式或傅立叶级数）。

我想在文档中的任何地方读到要包含pybind11 / complex.h的内容（例如，文档的11.1章）。我的问题是，当我这样做时，编译失败。尝试将方法绑定到以某种形式返回复杂类型对象的python时，会发生此故障。 如果我不包含'pybind11 / complex11'，则编译可以正常进行，并且方法可以正常工作，但是当我尝试从python复合体（例如（1 + 0j））构造这样的对象时，我的一些测试失败了。它抱怨说，尽管存在AC（complex），AC（AC）类型的构造函数，但没有定义相应的构造函数，而其他构造函数是通过'def（pybind11 :: init）'实现并可见的。

这是一个简单的示例，可以看到编译失败。

#include "pybind11/pybind11.h"
#include "pybind11/complex.h"
#include <complex>
#include <iostream>


class A {

};


template <typename T>
T copy(T& x)
{
    return T(x);
}


using AC = std::complex<A>;


PYBIND11_MODULE(TESTA,m)
{
    pybind11::class_<AC> inst(m,"AC","test for AC");
    inst.def(pybind11::init<>());
    inst.def("__copy__",&copy<AC>);
}

int main()
{
    std::cout << "Hello World!\n";
}

结果：

1>------ Build started: Project: Pybindtest,Configuration: Debug Win32 ------
1>Pybindtest.cpp
1>C:\Python38\include\pybind11\complex.h(59,1): error C2440: 'type cast': cannot convert from '_Ty' to 'double'
1>        with
1>        [
1>            _Ty=A
1>        ]
1>C:\Python38\include\pybind11\complex.h(59,38): message : No user-defined-conversion operator available that can perform this conversion,or the operator cannot be called
1>C:\Python38\include\pybind11\complex.h(58): message : while compiling class template member function 'pybind11::handle pybind11::detail::type_caster<std::complex<A>,void>::cast(const std::complex<A> &,pybind11::return_value_policy,pybind11::handle)'
1>C:\Python38\include\pybind11\pybind11.h(159): message : see reference to function template instantiation 'pybind11::handle pybind11::detail::type_caster<std::complex<A>,pybind11::handle)' being compiled
1>C:\Python38\include\pybind11\cast.h(1946): message : see reference to class template instantiation 'pybind11::detail::type_caster<std::complex<A>,void>' being compiled
1>C:\Python38\include\pybind11\pybind11.h(100): message : see reference to class template instantiation 'pybind11::detail::argument_loader<T &>' being compiled
1>        with
1>        [
1>            T=AC
1>        ]
1>C:\Python38\include\pybind11\pybind11.h(63): message : see reference to function template instantiation 'void pybind11::cpp_function::initialize<Return(__cdecl *&)(T &),Return,T&,pybind11::name,pybind11::is_method,pybind11::sibling>(Func,Return (__cdecl *)(T &),const pybind11::name &,const pybind11::is_method &,const pybind11::sibling &)' being compiled
1>        with
1>        [
1>            Return=AC,1>            T=AC,1>            Func=AC (__cdecl *&)(AC &)
1>        ]
1>C:\Python38\include\pybind11\pybind11.h(1117): message : see reference to function template instantiation 'pybind11::cpp_function::cpp_function<T,pybind11::sibling>(Return (__cdecl *)(T &),const pybind11::sibling &)' being compiled
1>        with
1>        [
1>            T=AC,1>            Return=AC
1>        ]
1>D:\temp for tests\Pybindtest\Pybindtest.cpp(29): message : see reference to function template instantiation 'pybind11::class_<AC> &pybind11::class_<AC>::def<T(__cdecl *)(T &),>(const char *,Func &&)' being compiled
1>        with
1>        [
1>            T=AC,1>            Func=AC (__cdecl *)(AC &)
1>        ]
1>D:\temp for tests\Pybindtest\Pybindtest.cpp(29): message : see reference to function template instantiation 'pybind11::class_<AC> &pybind11::class_<AC>::def<T(__cdecl *)(T &),1>            Func=AC (__cdecl *)(AC &)
1>        ]
1>C:\Python38\include\pybind11\complex.h(59,1): error C2660: 'PyComplex_FromDoubles': function does not take 1 arguments
1>C:\Python38\include\complexobject.h(47,24): message : see declaration of 'PyComplex_FromDoubles'
1>Done building project "Pybindtest.vcxproj" -- FAILED.
========== Build: 0 succeeded,1 failed,0 up-to-date,0 skipped ==========

我知道它告诉我有关转换失败的信息，但是我也不想将任何内容转换为两倍。在上述情况下，应将其转换为A，我认为这就是应该包含'pybind11 / complex.h'的原因。

最有可能是我做错了什么，或者我缺少了什么。 有什么建议吗？

谢谢 哈特默斯