C++数组类定义和实现，未在作用域中声明

Question

所以我一整天都在研究这个问题，它几乎可以工作，但是当我使用 GCC 编译它时，它给了我三个错误消息：

arrayClassDriver.cpp:11: error: 'arrayClass' was not declared in this scope
arrayClassDriver.cpp:11: error: expected ';' before 'test'
arrayClassDriver.cpp:13: error: 'test' was not declared in this scope

显然，它认为arrayClass（类实例）是一个变量。我该如何解决这个问题？

这是我对我的类的定义：

//Pre and Post Conditions
//arrayClass(int inputSize);
//Pre: A user defined int inputSize.
//Post: An array with size = inputSize has been created.
//~arrayClass();
//Pre: A dynamically created array.
//Post: The array has been deleted.
//void display();
//Pre: A dynamically created array.
//Post: List of all the values from the array.
//void resize(int newSize);
//Pre: A dynamically created array.
//Post: An array with the new size defined by the user.
//int& operator[](int location);
//Pre: None.
//Post: An operator which allows the programmer to access the array.
//int findMaxValue();
//Pre: A dynamically created array.
//Post: The max value of the array is returned.
//int findMinValue();
//Pre: A dynamically created array.
//Post: The min value of the array is returned.
//void sort();
//Pre: A dynamically created array.
//Post: A sorted array ready to be searched.
//int search(int key);
//Pre: A dynamically created array.
//Post: The sought value is returned.

#ifndef ARRAYCLASS_H
#define ARRAYCLASS_H
#include <iostream>
namespace arrayClass_Namespace
{
    class arrayClass
    {
        private:
            int *arr;
            const static int MAX_SIZE = 1000;
            int size;
        public:
            //Constructor
            arrayClass(int inputSize);
            //Destructor
            ~arrayClass();
            void display() const;
            void resize(int newSize);
            int& operator[](int);
            int findMaxValue();
            int findMinValue();
            void sort();
            int search(int key);
    };
}
#endif

这是我的实现（我知道我还没有编写排序或搜索的代码）：

#include <cassert>
#include "arrayClass.h"
arrayClass_Namespace::arrayClass::arrayClass(int inputSize)
{
    assert(inputSize < MAX_SIZE);
    size = inputSize;
    arr = new int[size];
    for (int index = 0; index < size; index++)
    {
        arr[index] = 0;
    }
}
arrayCLass_Namespace::arrayClass::~arrayClass()
{
    delete[] arr;
    arr = NULL;
}
void arrayClass_Namespace::arrayClass::display() const
{
    std::cout << "nIndex" << "t" << "Value";
    for (int index = 0; index < size; index++)
    {
        std::cout << index << "t" << arr[index];
    }
}
int& arrayClass_Namespace::arrayClass::operator[](int location)
{
    assert(0 <= location && location < size);
    return arr[location];
}
int arrayClass_Namespace::arrayClass::findMaxValue()
{
    int max = 0;
    for (int index = 0; index < size; index++)
    {
        if (max < arr[index])
        {
            max = arr[index];
        }
        else if (max > arr[index])
        {
            max = max;
        }
    }
}
int arrayClass_Namespace::arrayClass::findMinValue()
{
    int min = arr[1];
    for (int index = 0; index < size; index++)
    {
        if (min > arr[index])
        {
            min = arr[index];
        }
        else if (min < arr[index])
        {
            min = min;
        }
    }
}
void arrayClass_Namespace::arrayClass::sort()
{
}
int arrayClass_Namespace::arrayClass::search(int key)
{
}

最后，这是我的驱动程序（仍然需要添加一些东西，但我想先这样做）：

#include <cstdlib>
#include "arrayClass.h"
int main()
{
    arrayClass test(10);
    test.display();
    return EXIT_SUCCESS;
}

除此之外，我是否正确使用了显示成员功能？自从我与课程一起工作以来已经有一段时间了，所以任何帮助都非常感谢。

提前感谢！

Answer 1

您忘记在此语句中为 arrayClass 指定命名空间

arrayClass test(10);

应为

arrayClass_Namespace::arrayClass test(10);

或者你可以写

#include <cstdlib>
#include "arrayClass.h"
int main()
{
    using arrayClass_Namespace::arrayClass;
    arrayClass test(10);
    test.display();
    return EXIT_SUCCESS;
}