c++ - 在函数类中使用 push_back 更新指针 vector 的大小

Question

我在函数类中使用类 vector 的 push_back 时遇到问题。

我的代码是[所有变量都是葡萄牙语，抱歉]:

我的主要:

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

    //blah blah before here...

    vector <C_Aerogerador*> ptrAerogeradores;

    //the following lines are just for example
    int size = 4;
    for (int i = 0; i < size; i++)
    {
        ptrAerogeradores.push_back(new C_Aerogerador);
    }

    //OK, now I have a vector of pointer with size 4

    //Creating an object of C_Aerogerador to call a function Class of C_Aerogerador 
    C_Aerogerador * teste = new C_Aerogerador;

    teste->carregaConfig(ptrAerogeradores);

    //PROBLEM! After the calling of the function carregaConfig the 
    // size of ptrAerogeradores is still 4

}

C_Aerogerador´Class 的函数 carregaConfig 是:

void C_Aerogerador::carregaConfig(vector <C_Aerogerador*> ptrAerogerador)
{

    //blah blah, setting some values in ptrAerogerador
    // example:
    ptrAerogerador[0]->areaVarrida = 5;

    //after adding some values I want to push back the ptrAerogerador
    ptrAerogerador.push_back(new C_Aerogerador);
    // It didn't work.
}

Answer 1

更改您的函数签名以引用此vector

void C_Aerogerador::carregaConfig(vector <C_Aerogerador*>& ptrAerogerador);
                                                      // ^ Note

否则，您只是在函数参数堆栈上更改原始 vector 的拷贝。