就像$ 1是对输入类型图中的Python输入对象的引用一样，$ 1是对argout类型图中的C ++输出变量的引用。使用此方法，您可以为该数据生成一个Python对象，并将其附加到结果中。
这是Windows的功能示例：
#ifdef EXPORT
#define API __declspec(dllexport)
#else
#define API __declspec(dllimport)
#endif
struct ResultType
{
int x;
double y;
};
API void execute(int x, double y, ResultType& result1, ResultType& result2);
#define EXPORT
#include "test.h"
API void execute(int x, double y, ResultType& result1, ResultType& result2)
{
result1.x = 2 * x;
result1.y = 2 * y;
result2.x = 3 * x;
result2.y = 3 * y;
}
%module test
%{
#include "test.h"
%}
%include <windows.i>
%typemap(in,numinputs=0) ResultType& %{
// Create a persistent object to hold the result;
$1 = new ResultType;
%}
%typemap(argout) ResultType& (PyObject* tmp) %{
// Store the persistent object in a PyObject* that will be destroyed
// when it goes out of scope.
tmp = SWIG_NewPointerObj($1, $1_descriptor, SWIG_POINTER_OWN);
$result = SWIG_Python_AppendOutput($result, tmp);
%}
%include "test.h"
>>> import test
>>> r = test.execute(2,3)
>>> r[0].x
4
>>> r[0].y
6.0
>>> r[1].x
6
>>> r[1].y
9.0
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