错误附加整数在c + + boost python列表 [英] error to append integer in c++ boost python list

问题描述

我这样做并不起作用

  #include< boost / python.hpp> 
 
 namespace bp = boost :: python; 
 
 int main（int argc，char ** argv）{
 
 bp :: list points; 
 
 int one = 1; 
 int two = 2; 
 int third = 3; 
 points.append（one）; #crach！ 
 points.append（two）; 
 points.append（three）; 
 
 return 0;} 
  

这就是append

编辑

<解决方案是：

  #include< boost / python.hpp> 
 
 namespace bp = boost :: python; 
 
 int main（int argc，char ** argv）{
 Py_Initialize（）; // this part 
 bp :: list points; 
 
 int one = 1; 
 int two = 2; 
 int three = 3; 
 points.append（one）; #crach！ 
 points.append（two）; 
 points.append（three）; 
 Py_Finalize（）; // this part 
 return 0;} 
  

解决方案

我认为你应该在导出的模块中使用 boost :: python :: list ，而不是直接从C ++程序。原因很简单： boost :: python :: list 是一个Python列表对象的包装器，使用它需要一个Python解释器，

这是一个工作示例：

$

b
$ b

  #include< boost / python.hpp> 
 
 namespace bp = boost :: python; 
 
 bp :: list getlist（）{
 bp :: list points; 
 int one = 1; 
 int two = 2; 
 int three = 3; 
 points.append（one）; 
 points.append（two）; 
 points.append（three）; 
 return points; 
} 
 
 BOOST_PYTHON_MODULE（listtest）{
 using namespace boost :: python; 
 def（getlist，getlist）; 
} 
  

编译此模块并运行 getlist 函数显示一切都按预期工作：

 > import listtest 
>>> print listtest.getlist（）
 [1，2，3] 
  

I does this code and not work

#include <boost/python.hpp>

namespace bp = boost::python;

int main(int argc, char **argv) {

bp::list points;

int one = 1;
int two = 2;
int three = 3;
points.append(one); #crach!!
points.append(two);
points.append(three);

return 0;}

which is the reason why "append" does not accept integers and directly which would be the correct way?

edited

the solution is this:

#include <boost/python.hpp>

namespace bp = boost::python;

int main(int argc, char **argv) {
    Py_Initialize(); //this part
bp::list points;

int one = 1;
int two = 2;
int three = 3;
points.append(one); #crach!!
points.append(two);
points.append(three);
    Py_Finalize(); //this part
return 0;}

解决方案

I think you are supposed to use boost::python::list from within the exported module, not from a C++ program directly. The reason for this is simple: boost::python::list is a wrapper around a Python list object and to work with it you need a Python interpreter which is not available when you try to operate on the list from your main method.

Here's a working example:

#include <boost/python.hpp>

namespace bp = boost::python;

bp::list getlist() {
  bp::list points;
  int one = 1;
  int two = 2;
  int three = 3;
  points.append(one);
  points.append(two);
  points.append(three);
  return points;
}

BOOST_PYTHON_MODULE(listtest) {
  using namespace boost::python;
  def("getlist", getlist);
}

Compiling this module and running the getlist function shows that everything works as expected:

>>> import listtest
>>> print listtest.getlist()
[1, 2, 3]

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