c++无法将'std：：string' {aka 'std：：_cxx11：：basic_string'}转换为'std：：string(*)[3]' {aka 'std：：_cxx11：：basic_string(*)[3]'}

我目前正在尝试用C++制作一个tic-tac-toe AI。我目前正在制作一个函数来检查游戏的winstate，但当我尝试运行它时，我得到了这个错误：

61:34: error: cannot convert ‘std::string’ {aka ‘std::__cxx11::basic_string’} to ‘std::string (*)[3]’ {aka ‘std::__cxx11::basic_string (*)[3]’}
   61 |         cout << HasWon(Board[3][3], Length);
      |                        ~~~~~~~~~~^
      |                                  |
      |                                  std::string {aka std::__cxx11::basic_string<char>}
main.cpp:6:19: note:   initializing argument 1 of ‘int HasWon(std::string (*)[3], int)’
    6 | int HasWon(string GameBoard[3][3], int boardLength);
      |            ~~~~~~~^~~~~~~~~~~~~~~

字符串
我知道它与char和string有关，但我不知道如何在我当前的程序中实现它。代码如下：

#include <iostream>

using namespace std;

int AIMove(int PlayerMove);
int HasWon(string GameBoard[3][3], int boardLength);
int main () {
    int Length = 3;
    string Board[Length][Length] = {
        {" ", " ", " "},
        {" ", " ", " "},
        {" ", " ", " "},
    };
    int NodeMap[Length][Length] = {
        {0, 0, 0},
        {0, 0, 0},
        {0, 0, 0},
    };
    int NodeNumber = 1;
    for(int h = Length - 1; h >= 0;h--) {
        for(int d = 0; d < Length; d++) {
            NodeMap[h][d] = NodeNumber;
            NodeNumber++;
        }
    }

    int Player;
    bool HasMoved = false;
    bool run = true;
    while(run) {
        // Prints Tic Tac Toe board to the screen
        for(int h = 0; h < Length; h++) {
            cout << " ";
            for(int d = 0; d < Length; d++) {
                cout << Board[h][d];
                if(d < Length - 1) {
                    cout <<"||";
                }
            }
            if(h < Length - 1) {
                cout << "\n---------\n";
            }
        }
        // Gets player input
        cout << "\n choose a number 1-9 to place an X: ";
        cin >> Player;

        // Adds it to the board
        HasMoved = false;
        while(!HasMoved) {
            for(int h = 0; h < Length; h++) {
                for(int d = 0; d < Length; d++) {
                    if(NodeMap[h][d] == Player && Board[h][d] == " ") {
                        Board[h][d] = "X";
                        HasMoved = true;
                    }
                }
            }
            if(!HasMoved) {
                cout << "\n choose a number 1-9 to place an X: ";
                cin >> Player;
            }
        }
        cout << HasWon(Board[3][3], Length);
    }
}

int AIMove(int PlayerMove, int boardLength);

// Checks if anyone has won yet. 0: nothing has happend, 1: tie, 2: X win, 3: O win.
int HasWon(string GameBoard[3][3], int boardLength) {
    int xNumber = 0;
    int oNumber = 0;

    // Checks for vertical wins
    for(int d = 0;d < boardLength; d++) {
        xNumber = 0;
        oNumber = 0;
        for(int h = 0;h < boardLength; h++) {
            if(GameBoard[h][d] ==  "X") {
                xNumber++;
            }
            if(GameBoard[h][d] ==  "O") {
                oNumber++;
            }

            if(xNumber == boardLength ) {
                return 2;
            }
            if(oNumber == boardLength ) {
                return 3;
            }
        }
    }

    // Checks for horizontial wins
    for(int h = 0;h < boardLength; h++) {
        xNumber = 0;
        oNumber = 0;
        for(int d = 0;d < boardLength; d++) {
            if(GameBoard[h][d] ==  "X") {
                xNumber++;
            }
            if(GameBoard[h][d] ==  "O") {
                oNumber++;
            }

            if(xNumber == boardLength ) {
                return 2;
            }
            if(oNumber == boardLength ) {
                return 3;
            }
        }
    }

    // Checks for diagonal wins
    xNumber = 0;
    oNumber = 0;
    for(int i = boardLength - 1; i >= 0; i--) {
        if(GameBoard[i][i] == "X") {
            xNumber++;
        }
        if(GameBoard[i][i] == "O") {
            oNumber++;
        }

        if(xNumber == boardLength ) {
            return 2;
        }
        if(oNumber == boardLength ) {
            return 3;
        }
    }

    xNumber = 0;
    oNumber = 0;
    for(int i = 0;i < boardLength; i++) {
        if(GameBoard[i][i] == "X") {
            xNumber++;
        }
        if(GameBoard[i][i] == "O") {
            oNumber++;
        }

        if(xNumber == boardLength ) {
            return 2;
        }
        if(oNumber == boardLength ) {
            return 3;
        }
    }

    // Checks for a tie
    xNumber = 0;
    oNumber = 0;
    for(int h = 0;h < boardLength; h++) {
        for(int d = 0;d < boardLength; d++) {
            if(GameBoard[h][d] ==  "X") {
                xNumber++;
            }
            if(GameBoard[h][d] ==  "O") {
                oNumber++;
            }

            if(xNumber+oNumber == boardLength*boardLength) {
                return 1;
            }
        }
    }
    return 0;
}

型

问题在于，当作为调用参数传递时，表达式Board[3][3]的类型是std::string，而函数参数GameBoard的类型实际上是‘std::string (*)[3]。这是因为string [3][3]由于类型衰减而衰减为string (*)[3]。

因此，函数HasWon的参数类型与传递的参数存在不匹配。
在标准C++中，数组的大小必须是一个编译时常量。

int Length = 3;
string Board[Length][Length]; // This is not standard C++

字符串
语句string Board[Length][Length];不是标准C++，因为Length不是常量表达式。
要解决这个问题，您应该将顶层const添加到Length，并传递参数Board而不是Board[3][3]，如下所示：

//-vvvvv---------------------------> const added here
   const int Length = 3;
//----------------vvvvv------------> Changed to Board instead of Board[3][3]
   cout << HasWon(Board, Length);

型
Demo的一个。
另一种替代方法（更好）是使用std：：vector。

c++无法将'std：：string' {aka 'std：：_cxx11：：basic_string'}转换为'std：：string()[3]' {aka 'std：：_cxx11：：basic_string()[3]'}

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