c++ - 类模板成员不存在错误

Question

我刚开始学习模板，但在尝试使用该模板时，我在类模板和调用成员函数之间遇到了错误。

类模板

template<class T> class MyVector{
    private:
       int dataMembers;
    public:
        template<class T>
        void MyVector<T>::push_back(){//body of the function}
};

司机

int main()
{ 
     MyVector<Account*> bankAccounts;
     bankAccounts.push_back(//dynamic object);
     //error: class MyVector<Account*> has no member "push_back"
     //... 
    return 0;
}

Answer 1

您可以像这样在类中声明和定义模板函数:

template<class T>
class MyVector {
    private:
       int dataMembers;
    public:
        void push_back( T arg ) {
            //some code
        }
};

或者在外面定义body:

template<class T>
class MyVector {
    private:
       int dataMembers;
    public:
        void push_back( T arg );
};

template<class T>
void MyVector<T>::push_back( T arg ) {
    //some code
}