c++ - 试图引用已删除的函数(VS2013)

Question

我正在尝试用 SDL 编写跳棋游戏。当我编译我的代码时，我得到这个错误:

std::basic_ifstream>::basic_ifstream(conststd::basic_ifstream> &)' : attempting to reference a deleted function

根据我在网上找到的信息，这意味着编译出于某种原因帮助删除了我的构造函数，现在它再也找不到了。 (如果你问我，组织不好)为什么会这样？

板.h:

#include <fstream>
class Board
{
public:
    SDL_Surface * boardSurface;
    int boardArray[8][8];
private:
    std::ifstream boardFile;
    SDL_Surface * blackPiece;
    SDL_Surface * whitePiece;
    SDL_Surface * darkSquare;
    SDL_Surface * lightSquare;

public:
    Board(char filename[], SDL_PixelFormat * format);
private:
    void loadFile(char filename[]);
    void makeSurface();
    void debugPrint();
    void debugBlit();
};

板.cpp:

#include <SDL.h>
#include <fstream>
#include <iostream>
#include <stdlib.h>
#include "board.h"
#include "loaders.h"

Board::Board(char filename[], SDL_PixelFormat * format)
{
    //inits images
    loaders imageLoader;
    blackPiece = imageLoader.load_image("images/blackPiece.png", format);
    whitePiece = imageLoader.load_image("images/whitePiece.png", format);
    darkSquare = imageLoader.load_image("images/darkSquare.png", format);
    lightSquare = imageLoader.load_image("images/lightSquare.png", format);
    boardSurface = SDL_CreateRGBSurface(0, 780, 480, 8, 0, 0, 0, 0);
    loadFile(filename);
    debugPrint();
    debugBlit();
}
void Board::loadFile(char filename[])
{
    boardFile.open(filename);
    char currentLine[9] = {};
    for (int line = 0; line <= 7; line++)
    {
        boardFile.getline(currentLine, 9);
        for (int square = 0; square <= 7; square++)
        {
            int currentSquare = (int)currentLine[square] - '0'; 
            boardArray[line][square] = currentSquare;
        }
    }
}

void Board::makeSurface()
{

}

void Board::debugPrint()
{
    for (int line = 0; line <= 7; line++)
    {
        for (int square = 0; square <= 7; square++)
        {
            std::cout << boardArray[line][square];
        }
        std::cout << std::endl;
    }
}

void Board::debugBlit()
{
    for (int y = 0; y <= 4; y++)
    {
        if (SDL_BlitSurface(blackPiece, NULL, boardSurface, NULL) != 0)
        {
            std::cout << SDL_GetError();
        }
    }
}

Answer 1

错误发生是因为您有一个 std::ifstream 数据成员，并且您可能试图在某处复制一个 Board，或者有一些代码需要复制构造函数是可访问的。

std::ifstream boardFile;

Board 编译器提供的复制构造函数尝试复制流，但流不可复制。因此，您必须提供自己的复制构造函数来做一些聪明的事情，或者删除需要 Board 复制构造函数的代码。