python中带有静态成员的模板上的swig未定义符号

Question

需要使用 swig 将带有一些静态成员的模板类的一部分导出到 python。 一切都编译良好，并且模块已正确创建，名称为 _pipeit.so；当我从 python 执行 import pipeline 时出现问题，因为它给出以下错误：

ImportError: ./_pipeit.so: undefined symbol: _ZN8gestface13FactoriesPoolINS_9GeneratorEED1Ev

问题是否是由于模板中静态成员的使用而引起的？如果是的话应该如何处理？

下面是 swig 接口文件的代码：

%module pipeit
%include "std_string.i"

%{
    #define SWIG_FILE_WITH_INIT
    #include "factory/factories.h"
%}


namespace gestface{
%newobject FactoriesPool::build;

template<typename BuildedT>
class FactoriesPool{
private:
    FactoriesPool(){}
    FactoriesPool(const FactoriesPool& b);
    FactoriesPool& operator=(const FactoriesPool& b);

    std::map< std::string, Factory<BuildedT>* > factory_map;
    static FactoriesPool<BuildedT>* singleton_instance;
public:
    ~FactoriesPool();
    static const ConfigurationTemplate& get_configuration_template(const std::string& class_name) throw(bad_class);
    static BuildedT* build( const std::string& class_name,
                            const Configuration& conf = Configuration() ) throw(bad_parameter, bad_class);
};

%template( GeneratorFactoriesPool ) FactoriesPool< Generator >;
}

工厂、配置和生成器类也包含在接口文件中，为了简短起见，我不在这里报告它们，并且我不报告所有其他所需的 #includes 和异常处理同样的原因。

这是factories.h中的类的代码：

namespace gestface{

template<typename BuildedT>
class FactoriesPool{
private:
    FactoriesPool(){}
    FactoriesPool(const FactoriesPool& b);
    FactoriesPool& operator=(const FactoriesPool& b);

    std::map< std::string, Factory<BuildedT>* > factory_map;
    static FactoriesPool<BuildedT>* singleton_instance;

public:
    typedef BuildedT builded_t;
    ~FactoriesPool();

    void add_factory(const std::string& class_name, Factory<BuildedT>* factory){
        Factory<BuildedT>* f = factory_map[class_name];
        if(f) delete f;
        factory_map[class_name] = factory;
    }

    static FactoriesPool<BuildedT>* get_instance(){
        if(!singleton_instance) singleton_instance = new FactoriesPool<BuildedT>();
        return singleton_instance;
    }

    static const ConfigurationTemplate& get_configuration_template(const std::string& class_name) throw(bad_class){
        if(!singleton_instance) singleton_instance = new FactoriesPool<BuildedT>();
        const Factory<BuildedT>* f = singleton_instance->factory_map[class_name];
        if(!f){
            std::stringstream ss;
            ss << "No such class: " << class_name;
            throw bad_class(ss.str());
        }
        const ConfigurableFactory<BuildedT>* cf = dynamic_cast< const ConfigurableFactory<BuildedT>* >(f);
        if(!cf){
            std::stringstream ss;
            ss << "Not configurable: " << class_name;
            throw bad_class(ss.str());
        }

        return cf->get_configuration_template();
    }

    static BuildedT* build( const std::string& class_name,
                            const Configuration& conf = Configuration() ) throw(bad_parameter, bad_class){
        if(!singleton_instance) singleton_instance = new FactoriesPool<BuildedT>();
        const Factory<BuildedT>* f = singleton_instance->factory_map[class_name];
        if(!f){
            std::stringstream ss;
            ss << "No such class: " << class_name;
            throw bad_class(ss.str());
        }

        BuildedT* g;
        if(conf.get_template().parameters_num() != 0){
            const ConfigurableFactory<BuildedT>* cf = dynamic_cast< const ConfigurableFactory<BuildedT>* >(f);
            if(!cf){
                std::stringstream ss;
                ss << "Not configurable: " << class_name;
                throw bad_class(ss.str());
            }
            g = cf->build(conf);
        }else {
            g = f->build();
        }
        return g;
        }
};

template<typename BuildedT>
FactoriesPool<BuildedT>* FactoriesPool<BuildedT>::singleton_instance = 0;

}    

有人可以帮助我吗？

谢谢 卢卡

编辑： 这里遵循构建说明：

swig -Wall -c++ -python -o pipeit_wrap.cpp -outdir dist/Debug pipeit.i
g++ -c -g -ansi -I../../include -I/usr/include/python2.6 -fPIC -MMD -MP -MF build/Debug/pipeit_wrap.o.d pipeit_wrap.cpp -o build/Debug/pipeit_wrap.o
g++ -g -ansi -o dist/Debug/_pipeit.so build/Debug/pipeit_wrap.o -L../../dist/Debug/GNU-Linux-x86 -shared  -lboost_system -lpipeit

哦，我错过了说我的模板化 FactoriesPool 类（以及所有其他类）包含在我的共享库 libpipeit 中。

无论如何，我认为这不是构建命令的问题，因为我的接口文件包含许多其他类，其中一些也是模板化的，并且在我尝试导出模板化的最后一个类并且还包含一些静态类之前，所有这些都工作正常成员。

Answer 1

析构函数 ~FactoriesPool() 在哪里定义？运行时链接器正在寻找它。