c++ - 同一项目中两个类之间的C++ LNK2019错误

因此，我正在尝试创建一个模仿《扫雷》游戏的程序。我已经仔细检查了头文件，类名，并确保将头文件#include在其他cpp文件中，但是当我尝试构建程序时，在“Main”类中出现LNK2019错误。

完整错误:



我大概花了2个小时在此处查看StackOverflow和其他地方的答案，却一无所获。我遍历了this MSDN page中的每个要点，以及this popular answer中的每个“共同原因”，但似乎没有一个适合我的情况。我还尝试了MSDN页面上的所有“诊断工具”选项，而它们所做的只是让我更加困惑。

据我所知，最接近我的情况是this question，除了我的所有代码都在一个项目中，而不是在多个项目中。回答该问题的一位人士说:“我已将这些代码输入到Visual Studio中，并且工作正常”，并假定这些文件位于一个项目中。当我在这里遇到几乎相同的情况时，我不明白为什么该答案在那里起作用。

所以，无论如何，这是代码:

Main.cpp

#include <iostream>
#include <string>
#include "Cell.h"
#include "Board.h"

int main() {
    Board *bee;
    bee = new Board(50, 50, 50);

    std::cout << "board created";

    return 0;
}

Board.cpp

#include <iostream>
#include <string>
#include <ctime>
#include <cstdlib>
using namespace std;
#include "Cell.h"
#include "Board.h"
#ifndef BOARD_H
#define BOARD_H

// Board class. Used to create an array of cell objects to function as data model for Minsweeper game.
class Board
{
private:
int width; // number of columns in board
int height; // number of rows in board
int mines; // number of mines stored in board
Cell*** cells; // array storing cell objects

public:

// Constructor for board. Takes number of columns, rows, and mines as parameters
Board::Board(int cols, int rows, int numMines) {
    width = cols;
    height = rows;
    mines = numMines;
    cells = new Cell**[height];
    for (int i = 0; i < height; i++) {
        cells[i] = new Cell*[width];
    }
    int c = 0;
    int r = 0;
    while (r < height)
    {
        while (c < width)
        {
            setCell(c, r, CellValue::COVERED_CELL);
            c++;
        }
        c = 0;
        r++;
    }
    int m = 0;
    while (m < numMines)
    {
        std::srand(std::time(nullptr));
        int x = generateRandomNumberInRange(0, width - 1);
        int y = generateRandomNumberInRange(0, height - 1);
        if (!(getCellVal(x, y) == MINE))
        {
            setCell(x, y, CellValue::MINE);
            m++;
        }
    }
}

    // Accessor for width field
int Board::getWidth()
{
    return width;
}

// Accessor for height field
int Board::getHeight()
{
    return height;
}

// Accessor for mines field
int Board::getMines()
{
    return mines;
}

// Function to access value of cell located in array where x is column parameter and y is row parameter
CellValue Board::getCellVal(int x, int y)
{
    CellValue value = CellValue::INVALID_CELL;

    if (!(x < 0 || x >(width - 1) || y < 0 || y >(height - 1)))
    {
        Cell temp = *cells[x][y];
        value = temp.getValue();
    }

    return value;
}

// Function to set value of cell located in array where x is column parameter and y is row parameter
void Board::setCell(int x, int y, CellValue value)
{
    if (!(x < 0 || x >(width - 1) || y < 0 || y >(height - 1)))
    {
        Cell temp = *cells[x][y];
        temp.setValue(value);
    }
}

// Function to determine if game is lost
// Loops through array to see if there are any UNCOVERED_MINES
// If so, returns true, game ends, as you've lost :(
// If not, returns false and game can continue
// Should run after every click action in game
bool Board::isGameLost()
{
    bool isLost = false;
    int c = 0;
    int r = 0;
    while (r < height)
    {
        while (c < width)
        {
            if (getCellVal(c, r) == UNCOVERED_MINE)
            {
                isLost = true;
            }
            c++;
        }
        c = 0;
        r++;
    }
    return isLost;
}

// Function to determine if game is won
// Loops through array to determine if there are any falsely flagged mines, unflagged mines, covered cells, or uncovered mines
// If there are, returns false and game continues
// If not, returns true, games ends, you've won :)
bool Board::isGameWon()
{
    bool isWon = true;
    int c = 0;
    int r = 0;
    while (r < height)
    {
        while (c < width)
        {
            CellValue value = getCellVal(c, r);
            if ((value == FLAG) ||
                (value == MINE) ||
                (value == COVERED_CELL) ||
                (value == UNCOVERED_MINE))
            {
                isWon = false;
            }
            c++;
        }
        c = 0;
        r++;
    }
    return isWon;
}

};


#endif

Board.h

#include <iostream>
#include <string>
#include "Cell.h"
#ifndef BOARD_H
#define BOARD_H

class Cell;
enum CellValue;

class Board
{
private:
    int width;
    int height;
    int mines;
    Cell*** cells;

public:
    Board(int cols, int rows, int numMines);
    int getWidth();
    int getHeight();
    int getMines();
    CellValue* getCellVal(int x, int y);
    void setCell(int x, int y, CellValue value);
    void uncoverCell(int x, int y);
    void flagCell(int x, int y);
    bool isGameLost();
    bool isGameWon();
};

#endif

我知道这是人们常见的错误，并且在StackOverflow上还有很多其他问题，但是到目前为止，我还没有发现任何与我在此相符的问题。这是什么问题？

最佳答案

似乎您要混合头文件和源文件。您的cpp文件包含一个class声明，其中定义了所有函数。这不是cpp文件的外观。它只应包含函数声明:

Board::Board(...)
{
    ...
}

bool Board::IsGameWon...

等等...

关于c++ - 同一项目中两个类之间的C++ LNK2019错误，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/36960820/