我正在尝试用 C++ 进行国际象棋模拟。我创建了一个类 Pieces,我想在堆上创建一个由所有 Pieces 组成的二维数组。这是我的代码:国王、王后和其他代码源自棋子。
king = new King();
queen = new Queen();
knight = new Knight();
bishop = new Bishop();
rook = new Rook();
pawn = new Pawn();
empty = new Pieces();
Pieces* startup[64] = {rook, knight, bishop, king, queen, bishop, knight, rook,
pawn, pawn, pawn, pawn, pawn, pawn, pawn, pawn,
empty, empty, empty, empty, empty, empty, empty, empty,
empty, empty, empty, empty, empty, empty, empty, empty,
empty, empty, empty, empty, empty, empty, empty, empty,
empty, empty, empty, empty, empty, empty, empty, empty,
pawn, pawn, pawn, pawn, pawn, pawn, pawn, pawn,
rook, knight, bishop, king, queen, bishop, knight, rook};
Pieces* board = new Pieces[8][8];
int k = 0;
for (int i = 0; i < 8; i++) {
for (int j = 0; j < 8; j++) {
board[i][j] = startup[k];
k++;
}
}
但这给了我以下错误:
ChessBoard.cpp: In constructor ‘ChessBoard::ChessBoard()’:
ChessBoard.cpp:25: error: cannot convert ‘Pieces (*)[8]’ to ‘Pieces*’ in initialization
ChessBoard.cpp:29: error: no match for ‘operator[]’ in ‘board[i][j]’
如何在堆上成功分配二维数组? 创建指向 Pieces 的指针数组或创建 Pieces 对象数组哪个更好?
最佳答案
为什么需要所有动态分配?只需拥有一个 64 元素枚举数组,并在顶部分层一些伪造的 2D 索引即可。
这是一个例子:
#include <array>
#include <iostream>
enum class piece_t
{
EMPTY = 0, PAWN, ROOK, BISHOP, KNIGHT, QUEEN, KING
};
static const size_t WIDTH = 8, HEIGHT = 8;
struct board_t : std::array<piece_t, WIDTH*HEIGHT>
{
board_t()
{
for (size_t y = 0; y < HEIGHT; y++)
for (size_t x = 0; x < WIDTH; x++)
operator()(x,y) = piece_t::EMPTY;
}
piece_t& operator()(size_t x, size_t y)
{
return operator[](x + y*WIDTH);
}
const piece_t& operator()(size_t x, size_t y) const
{
return operator[](x + y*WIDTH);
}
};
std::ostream& operator<<(std::ostream& os, const piece_t& piece)
{
switch (piece) {
case piece_t::KING: return (os << 'K');
case piece_t::QUEEN: return (os << 'Q');
case piece_t::KNIGHT: return (os << 'N');
case piece_t::BISHOP: return (os << 'B');
case piece_t::ROOK: return (os << 'R');
case piece_t::PAWN: return (os << 'P');
case piece_t::EMPTY: return (os << ' ');
default: return (os << '?');
}
}
std::ostream& operator<<(std::ostream& os, const board_t& board)
{
os << '+' << std::string(WIDTH, '-') << '+' << '\n';
for (size_t y = 0; y < HEIGHT; y++) {
os << '|';
for (size_t x = 0; x < WIDTH; x++)
os << board(x, y);
os << '|' << '\n';
}
os << '+' << std::string(WIDTH, '-') << '+' << '\n';
return os;
}
int main()
{
board_t b;
b(3, 5) = piece_t::KING;
b(6, 4) = piece_t::KNIGHT;
std::cout << b << std::endl;
// etc.
}
Live demo
简单多了,而且更安全。 :-)
关于c++ - 如何在 C++ 堆上创建二维数组?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/21138427/