我是SWIG的新人。我创建了一个使用c ++类的python模块。
我的cpp头文件是
GradedComplex.h:
class GradedComplex { public: typedef std :: complex< double&复合物 typedef Item< dcomplex>物品种类; typedef ItemComparator< dcomplex>比较器 typedef std :: set< item_type,comparator> grade_type; private: int n_; std :: vector< grade_type *>年级_; std :: vector< double> thre_; public: GradedComplex(int n,double * thre); 〜GradedComplex(); void push(item_type item); void avg(double * buf); }且CPP代码为
#include< iostream> #includeGradedComplex.h using namespace std; GradedComplex :: GradedComplex(int n,double * thre) { n_ = n; for(int i = 0; iexample.i
/ * File:example.i * / %模块示例%{ #includeItem.h #includeGradedComplex.h #includeGradedDouble.h%} %include< std_string.i> %include< std_complex.i> %includeItem.h%includeGradedComplex.h%includeGradedDouble.h%template(Int)Item< int> %template(Complex)Item< std :: complex< double> > ;;我已经通过运行 * python setup.py build_ext --inplace * 此命令。
现在我想从python访问 GradedComplex(int n,double * thre) b $ b
当我尝试访问 GradedComplex 时,它显示 ** TypeError:在方法'new_GradedComplex' >'错误*
如何从python模块传递双指针?请帮助我排序这个问题。
解决方案使用向量直接在构造函数中并利用SWIG的向量支持:
在 .i 文件中:
%include< std_vector.i> %template(DoubleVector)std :: vector< double> ;; %包括GradedComplex.h在 .h :
GradedComplex(const std :: vector< double>& dbls)在 .cpp :
GradedComplex :: GradedComplex(const vector< double& dbls):thre_(dbls) {}n _ c $ c> thre_.size()是一回事。
调用它:
c = Item.GradedComplex([1.2,3.4,5.6])SWIG可以处理返回向量,因此 avg 可以是:
std :: vector< double> GradedComplex :: avg(){...}
I am new to SWIG. I have created a python module to use c++ classes.
My cpp header code is
GradedComplex.h :
class GradedComplex { public: typedef std::complex<double> dcomplex; typedef Item<dcomplex> item_type; typedef ItemComparator<dcomplex> comparator; typedef std::set<item_type, comparator> grade_type; private: int n_; std::vector<grade_type *> grade_; std::vector<double> thre_; public: GradedComplex(int n, double *thre); ~GradedComplex(); void push(item_type item); void avg(double *buf); };And CPP code is
#include <iostream> #include "GradedComplex.h" using namespace std; GradedComplex::GradedComplex(int n, double *thre) { n_ = n; for (int i = 0; i < n_; ++i) { thre_.push_back(thre[i]); grade_.push_back(new grade_type()); } } GradedComplex::~GradedComplex() { while (0 < grade_.size()) { delete grade_.back(); grade_.pop_back(); } } void GradedComplex::push(item_type item) { for (int i = 0; i < n_; ++i) { if (item.norm() < thre_[i]) { grade_[i]->insert(item); break; } } } void GradedComplex::avg(double *buf) { for (int i = 0; i < n_; ++i) { int n = 0; double acc = .0l; for (grade_type::iterator it = grade_[i]->begin(); it != grade_[i]->end(); ++it) { acc += (*it).norm(); ++n; } buf[i] = acc / n; } }My SWIG interface file is :
example.i
/* File: example.i */ %module example %{ #include "Item.h" #include "GradedComplex.h" #include "GradedDouble.h" %} %include <std_string.i> %include <std_complex.i> %include "Item.h" %include "GradedComplex.h" %include "GradedDouble.h" %template(Int) Item<int>; %template(Complex) Item<std::complex<double> >;I have generated python module by running *python setup.py build_ext --inplace* this command.
And now I want to access GradedComplex(int n, double *thre) from python
When I tried to access GradedComplex it shows **TypeError: in method 'new_GradedComplex', argument 2 of type 'double ' error*
How do I pass double pointer from python module? Please help me to sort this issue.
解决方案It is simpler to use a vector directly in the constructor and take advantage of SWIG's vector support:
In the .i file:
%include <std_vector.i> %template(DoubleVector) std::vector<double>; %include "GradedComplex.h"In the .h:
GradedComplex(const std::vector<double>& dbls);In the .cpp:
GradedComplex::GradedComplex(const vector<double>& dbls) : thre_(dbls) { }n_ can go away, since thre_.size() is the same thing.
Call it with:
c=Item.GradedComplex([1.2,3.4,5.6])SWIG can handle returning vectors as well, so avg can be:
std::vector<double> GradedComplex::avg() { ... }
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