c++ - 如何修复 "use of class template requires template argument list"

Question

我使用模板编写了一些关于堆栈的代码。但现在，坚持这个小错误。我尽可能地尝试了很多次，但不知道该怎么做。另外，我看到很多相同的错误问题，但我的问题似乎有所不同。

我正在写作中。所以，有一些未完成的代码。如果您看到错误但不是导致错误的原因，请忽略它。

#ifndef STACKINTERFACE_H
#define STACKINTERFACE_H

using namespace std;

template <typename T>
class StackInterface {
public:
    StackInterface() {};
    virtual ~StackInterface() {};
    virtual bool isEmpty() const = 0;
    virtual bool isFull() const = 0;
    virtual void push(T data) = 0;
    virtual void pop() = 0;
    virtual T top() const = 0;
};


#include "StackInterface.h"

#include <iostream>
template <typename T>
class Stack : public StackInterface {
private:
    T * items;
    const static int max = 10;
    const static int GROWBY = 5;
    size_t arrayCapacity;
    size_t numItems;
    int top_position;
public:
    Stack();
    virtual void push(T data);
    virtual T top() const;
    virtual void pop();
    virtual bool isEmpty() const;
    virtual bool isFull() const;
    size_t getArrayCapacity();
    size_t getNumItems();
    Stack<T> operator=(const Stack<T>&Other);
    ~Stack();
    Stack(const Stack<T>& other);
};

template <typename T>
Stack<T>::Stack() 
{
    items = new T[max];
    numItems = 0;
    top_position = -1;
}

template <typename T>
Stack<T>::~Stack() {
    cout << "deleting..." << endl;
    delete[] items;
}

template <typename T>
void Stack<T>::push(T data) {
    cout << "inserting" << data << endl;
    if (numItems < arrayCapacity) {
        T[++top_position] = data;
    }
    numItems++;
}
template <typename T>
void Stack<T>::pop() {
    if (isEmpty) {
        cout << "The stack is empty. Returned value not reliable.\n";
    }
    else {
        cout << "removing" << top() << endl;
        retrun T[top_position--];
    }
}

template <typename T>
bool Stack<T>::isEmpty() const
{
    if (numItems == 0) {
        return true;
    }
    else {
        return false;
    }
}

template <typename T>
bool Stack<T>::isFull() const
{
    if (numItems == max) {
        return true;
    }
    else {
        return false;
    }
}

template <typename T>
T Stack<T>::top() const
{
    if (!isEmpty()) {
        return T[top_position];
    }
    else {
        throw exception;
    }
}

template <typename T>
Stack <T> Stack<T>:: operator=(const Stack<T>&Other) {
    if (&Other == this) {
        return *this;
    }   
}

template <typename T>
Stack<T>::Stack(const Stack<T>& other) {
    items = new items(other.items);
    numItems = other.numItems;
    top_position = other.top_position;
    arrayCapacity = other.arrayCapacity;
}

template <typename T>
size_t Stack<T>::getArrayCapacity() {
    return arrayCapacity;
}

template <typename T>
size_t Stack<T>::getNumItems() {
    return numItems;
}

int main() {

    Stack <int> S1;


    system("pause");
    return 0;
}

Answer 1

您需要为您的父类(super class)提供模板参数。而不是这个:

template <typename T>
class Stack : public StackInterface {

这样做:

template <typename T>
class Stack : public StackInterface<T> {

(您的代码也有很多其他问题，但这就是您解决所询问的特定问题的方式。)