C++设计模式——享元模式(高屋建瓴)

原网址：https://blog.csdn.net/CoderAldrich/article/details/83183271
做出如下修改：

#include <iostream>
#include <map>
#include <vector>
using namespace std;
typedef struct PointTag__ {int x_;int y_;PointTag__(){}PointTag__(int a, int b) {x_ = a;y_ = b;}bool operator <(const PointTag__& other) const {if (x_ < other.x_) {return true;} else if (x_ == other.x_) {return y_ < other.y_;}return false;}
} Point;typedef enum PieceColorTag__ {BLACK,WHITE
} PIECECOLOR;// 存放坐标点和棋子颜色的类，提供接口可以设置或者获取坐标点和获取颜色
class CPiece {public:CPiece(PIECECOLOR color) : color_(color){}PIECECOLOR GetColor() {return color_;}void SetPoint(Point point) {point_ = point;}Point GetPoint() {return point_;}protected:PIECECOLOR color_;Point point_;
};class CGomoku : public CPiece {public:CGomoku(PIECECOLOR color) : CPiece(color){}
};// 用vec存贮多个CPiece
class CPieceFactory {public:// 判断颜色（白色或者黑色）是否已经创建，来避免重复创建CPieceCPiece *GetPiece(PIECECOLOR color) {CPiece *piece = NULL;if (piece_vec_.empty()) {piece = new CGomoku(color);piece_vec_.push_back(piece);} else {for (vector<CPiece *>::iterator it = piece_vec_.begin(); \it != piece_vec_.end(); ++it) { if ((*it)->GetColor() == color) {piece = *it;//<------------------------->避免重复创建break;}}if (piece == NULL) {piece = new CGomoku(color);piece_vec_.push_back(piece);}}return piece;}~CPieceFactory() {for (vector<CPiece *>::iterator it = piece_vec_.begin(); \it != piece_vec_.end(); ++it) {if (*it != NULL) {delete *it;}}}private:vector<CPiece *> piece_vec_;
};/*
将 CPieceFactory里面判断好的piece(避免重复制造)以及对应的坐标点，
存到一个map里面，以便于全部展现
*/
class ChessBoard {public:void Draw(CPiece *piece) {if (piece->GetColor() == WHITE) {cout << "Draw a White" << " at (" << piece->GetPoint().x_ << ","\<< piece->GetPoint().y_ << ")" << endl;} else if (piece->GetColor() == BLACK) {           cout << "Draw a Black" << " at (" << piece->GetPoint().x_ << ","\<< piece->GetPoint().y_ << ")" << endl;}point_piece_map_.insert(pair<Point, CPiece *>(piece->GetPoint(), piece));}void ShowAllPieces() {for (map<Point, CPiece *>::iterator it = point_piece_map_.begin();\it != point_piece_map_.end(); ++it) {if (it->second->GetColor() == WHITE) {cout << "(" << it->first.x_ << "," << it->first.y_ << \")has a white chece ." << endl;} else if (it->second->GetColor() == BLACK) {cout << "(" << it->first.x_ << "," << it->first.y_ << \")has a black chece ." << endl;}}}private:map<Point, CPiece *> point_piece_map_;
};int main() {CPieceFactory *piece_factory = new CPieceFactory();ChessBoard *chess_board = new ChessBoard();CPiece *piece = piece_factory->GetPiece(WHITE);// 判断是否已经创建了白色棋子piece->SetPoint(Point(2, 3));//结构体不需要new对象chess_board->Draw(piece);piece = piece_factory->GetPiece(BLACK);piece->SetPoint(Point(4, 5));chess_board->Draw(piece);piece = piece_factory->GetPiece(WHITE);piece->SetPoint(Point(2, 4));chess_board->Draw(piece);piece = piece_factory->GetPiece(BLACK);piece->SetPoint(Point(3, 5));chess_board->Draw(piece);// show all chesscout<<"Show all cheses"<<endl;chess_board->ShowAllPieces();if (piece_factory != NULL) {delete piece_factory;piece_factory = NULL;}if (chess_board != NULL) {delete chess_board;chess_board = NULL;}
}

运行结果：
Draw a White at (2,3)
Draw a Black at (4,5)
Draw a White at (2,4)
Draw a Black at (3,5)
Show all cheses
(2,3)has a white chece .
(2,4)has a white chece .
(3,5)has a black chece .
(4,5)has a black chece .

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C++设计模式——享元模式(高屋建瓴)

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