SWIG:如何将复杂列表从C ++传递给python [英] SWIG: How to pass list of complex from c++ to python

问题描述

我在c ++中有一个函数，该函数返回一个复杂列表:

I have a function in c++ who returns a list of complex:

#include <complex>
std::list< std::complex<double> > func(...);

我应该在'* .i'文件中做什么?

what should i do in the '*.i' file ?

谢谢大家

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以下是详细信息:

我想在x.h中的python中使用的函数:

the function i would like to use in python in x.h:

std::list<std::complex<double> > roots1(const double& d, const double& e);

我尝试了一些方法:

(1)x.i:

%include <std_list.i>
%include <std_complex.i>

比我在IPython中尝试的时间

than I try in IPython:

tmp = x.roots1(1.0, 2.0)
len(tmp)

然后我得到了

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-5-9ebf7dab7cd9> in <module>()
----> 1 len(tmp)

TypeError: object of type 'SwigPyObject' has no len()

和:

dir(tmp)

返回:

[ 
...
'acquire',
'append',
'disown',
'next',
'own']

(2)x.i:

%include <std_list.i>
%include <std_complex.i>
namespace std {
    %template(ComplexDouble)        complex<double>;
}

然后，我得到了编译错误:

than, i got compile error:

error: command 'swig' failed with exit status 1
make: *** [py] Error 1

(3)in x.i:

%include <std_list.i>
%include <std_complex.i>
namespace std {
    %template(ComplexDouble)        list<complex<double> >;
}

或:

%include <std_list.i>
%include <std_complex.i>
namespace std {
    %template(ComplexDouble)        list<complex>;
}

然后我得到了

x_wrap.cpp:5673:32: error: ‘complex’ was not declared in this scope
 template <>  struct traits<complex > {
                            ^

================================================ =

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(先生/女士/夫人)m7thon帮助我找到了问题. 在我的python上下文中:

(Mr./Ms./Mrs) m7thon help me find the problem. In my python context:

Ubuntu: 45~14.04.1
Python:  3.4.3
SWIG:    SWIG Version 2.0.11
         Compiled with g++ [x86_64-unknown-linux-gnu]
         Configured options: +pcre

如果将x.i定义为:

%include <std_list.i>
%include <std_complex.i>
namespace std {
    %template(ComplexList)        list<complex<double> >;
}

会有编译错误.但是，如果x.i:

there will be compiling error. But it works if x.i:

%include <std_list.i>
%include <std_complex.i>
%template(ComplexList) std::list< std::complex<double> >;

谢谢你.

推荐答案

这有效:

%include <std_list.i>
%include <std_complex.i>
%template(ComplexList) std::list<std::complex<double> >;
... (your includes / function declarations)

我认为您的版本(3)实际上也应该有效.奇怪的是没有.也许是SWIG错误.

I think your version (3) should actually also work. Strange that it doesn't. Maybe a SWIG bug.

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