使用具有抽象基类指针的映射并调用派生类函数

我已经在网上搜索过,找不到任何解决我问题的方法,希望你能帮我。

因此,我构建了一个抽象基类,并有两个派生类来表示不同的实验。(一个实际上是我的基类的派生类)我在一个单独的头文件中创建了这样的映射,以存储不同类型的实验。

//Map class template to store name of experiment and the experiment within a project
typedef map <string, baseData <double>*> ExpContainer;

void search(string searchName, ExpContainer exps) {
    ExpContainer::iterator Iter;
    Iter = exps.find(searchName); //finds the entry corresponding to searchName and returns the iterator
    if (Iter != exps.end()) { //need this as if entry is not found, the return will be end iter.
        cout << "Found the experiment " << Iter->first << "." << endl;
        Iter->second->print();
    }
    else {

        cout << "Sorry, experiment " << searchName << " is not found" << endl;
    }

}

对于每个实验类型,print()函数都是不同的,我知道存在一个称为切片的问题,所以我已经确保print()在基类中是虚拟的。这是我的基本类:

namespace mynmsp {

//base class of data can be measurements or errors
template < class T> class baseData { 

public:
    virtual void print() =0;
    virtual ~baseData() {
        cout << "Destructor called for the base class." << endl;
    }
};
}

然后在我的主要。我构建了不同类型的实验,我想打印出来。每个实验类都有不同的打印函数实现,该函数覆盖了基类中的打印函数,如:

void print(){ //do something }; 

在我的主要。cpp I将映射定义为:

ExpContainer project;

在构建完每个实验之后,我向用户询问实验的名称(expName),并将其插入到项目中,如下所示:

project[expName] =  &expC;

我认为插入是好的,因为我测试了项目的大小,它是正确的。 但是,当我的搜索函数按如下方式调用时,发生了运行时错误:

search(name, project);

我不知道切片还是指针有问题? 我试图在每个派生类中使print()成为一个虚拟函数,但这似乎也不起作用。

很抱歉问了这么长的问题,请帮帮我!

编辑:我在do-while循环中构造了实验,而在外部声明了项目。整个代码很长,但其基本内容如下:

string repeatstr; //user input whether to repeat do while loop or not
bool repeat = true; //condition for staying inside do while loop
ExpContainer project; //declared project to store experiments

do {
    string expName;
    string ans1; //character to store user input
    cout << "What is the name of your experiment? " << endl;
    cin >> expName;
    cout << "Is this a experiment C ? (y/n)" << endl;
    cin >> ans1; 
       if(ans1 =="y"){ 
           //call the constructor for expC
           project[expName] = &expC;
        }else {
           //call the constructor for expB 
          project[expName] = &expB;
        }

    cout << "Do you want to enter another experiment?  (y/n)" << endl;
    cin >> repeatstr;
    if (repeatstr == "n") { repeat = false;  }

}while (repeat); //loop over this do-while loop while repeat is true

    cout << "There are " << project.size() << " in this database." << endl;

    //to retrieve info from a certain experiment
    string input, name;
    cout << "Would you like to retrieve any experiments (y/n)? " << endl;
    input = EitherInput("y", "n");
    if (input == "y") {
        cout << "Please enter the name of the experiment you want to retrieve: " << endl;
        cin >> name;
        search(name, project); //code breaks down here!
    }