SWIG:未定义类型映射

问题描述

我有一个 C++ 类，我正在尝试使用 SWIG 为 Python 包装它.我在尝试包装以数组作为输入的函数之一时遇到问题.

这是头文件，

class dyndiff_data_t{私人的:双H[3];双伽马；双k;双P;民众:dyndiff_data_t(双H_[3]，常量双 GAMMA_，常量双 k_，常量双 P_);无效测试()；};

这里是 swig 接口文件，

%module twowave%{#define SWIG_FILE_WITH_INIT#include <twowave.h>%}%include "numpy.i"％在里面 ％{import_array();%}%apply (double IN_ARRAY1[3]) {(double H_[3])};%include <twowave.h>

问题是对于数组输入，SWIG 抱怨没有类型映射.我不明白为什么.numpy.i 文件取自 here 和here>

任何帮助将不胜感激.

解决方案

问题是 numpy.i 中的 typemap 定义了一个两个参数的 typemap，而您正试图将它应用于单个参数.如果您的函数中有参数 int len1 和 double* vec1，这将起作用:

%apply (int DIM1, double* IN_ARRAY1) {(int len, double* H_)}

与其编写自己的 typemap，不如使用 carrays.i.

如果您要编写类型映射，例如将双精度元组作为输入，它看起来像:

%typemap(in) double TUPLE[ANY]{...}

在这种情况下，您可以按照您期望的方式将其应用到您的函数中.

%apply double TUPLE[3] {double H_[3]}

在尝试找出不能使用类型映射的原因时，一个不错的起点是使用 -tmsearch 选项运行 SWIG.在尝试匹配您的函数参数时，它会告诉您它在寻找什么.

I have a c++ class that I am trying to wrap for Python using SWIG. I am having trouble trying to wrap one of the functions which takes an array as input.

Here's the header file,

class dyndiff_data_t
    {
    private:

        double H[3];
        double GAMMA;
        double k;
        double P;
    public:
        dyndiff_data_t(double H_[3],
                        const double GAMMA_,
                        const double k_,
                        const double P_);

        void test();
    };

and here's the swig interface file,

%module twowave
%{
  #define SWIG_FILE_WITH_INIT
  #include <twowave.h>
%}

%include "numpy.i"
%init %{
import_array();
%}

%apply (double IN_ARRAY1[3]) {(double H_[3])};

%include <twowave.h>

The problem is that for the array input, SWIG complains that there is no typemap. I don't understand why. The numpy.i file was taken from here and the typemap I am using is described here

Any help would be appreciated.

解决方案

The problem is that the typemap in numpy.i defines a two argument typemap, and you're trying to apply it to a single argument. This would work if you had parameters int len1, and double* vec1 in your function:

%apply (int DIM1, double* IN_ARRAY1) {(int len, double* H_)}

Rather than writing your own typemap, just use carrays.i.

If you WERE to write a typemap, e.g. to take a tuple of doubles as input, it would look something like:

%typemap(in) double TUPLE[ANY]
{
   ...
}

in which case you would apply it to your function the way you expect.

%apply double TUPLE[3] {double H_[3]}

A good place to start when trying to figure out why you can't use a typemap is to run SWIG with the -tmsearch option. It will tell you what it's looking for when trying to match your function parameters.

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