我有一个问题,涉及到
这里是我使用
typename SnakeGame
。我想知道如何将SnakeGame
作为全局类型放到KeyboardEvents
类中。现在像DirectionKeyboard
这样的嵌套类不知道SnakeGame
是什么类型,因为它只能看到KeyboardEvents<SnakeGame>
类型。我不知道该怎么改:P
以下是错误信息:
无法将参数1从“KeyboardEvents SnakeGame>&”转换为“SnakeGame&”
我真的很需要帮助。
keyboardEvents.hpp
#include<SFML/Graphics.hpp>
template <typename SnakeGame>
class KeyboardEvents {
public:
virtual ~KeyboardEvents() = default;
protected:
class DirectionKeyboardEvent{
public:
virtual ~DirectionKeyboardEvent() = default;
virtual void direction(SnakeGame&) = 0; // error no know conversion
};
class GoRight : public DirectionKeyboardEvent {
public:
void direction(SnakeGame& snakeObj) {
snakeObj.snake[0].xCoor+=1;
}
};
class GoRight : public DirectionKeyboardEvent {
public:
void direction(SnakeGame& snakeObj){
snakeObj.snake[0].xCoor += 1;
}
};
class GoLeft : public DirectionKeyboardEvent{
public:
void direction(SnakeGame& snakeObj){
snakeObj.snake[0].xCoor-=1;
}
};
class GoUp:public DirectionKeyboardEvent{
public:
void direction(SnakeGame& snakeObj){
snakeObj.snake[0].yCoor-=1;
}
};
class GoDown : public DirectionKeyboardEvent{
public:
void direction(SnakeGame& snakeObj){
snakeObj.snake[0].yCoor+=1;
}
};
std::map<sf::Keyboard::Key, std::shared_ptr<DirectionKeyboardEvent>> mapOfDirects;
void initializeDirectionMap() {
mapOfDirects[sf::Keyboard::Right] = std::shared_ptr< DirectionKeyboardEvent >(new GoRight);
mapOfDirects[sf::Keyboard::Left] = std::shared_ptr<DirectionKeyboardEvent>(new GoLeft);
mapOfDirects[sf::Keyboard::Up] = std::shared_ptr<DirectionKeyboardEvent>(new GoUp);
mapOfDirects[sf::Keyboard::Down] = std::shared_ptr<DirectionKeyboardEvent>(new GoDown);
}
void chooseMethodFromKeyboardArrows(sf::Keyboard::Key codeFromKeyboard) {
auto iterator = mapOfDirects.find(codeFromKeyboard);
if(iterator!=mapOfDirects.end()){
iterator->second->direction(*this);//left , right,up , down, pause
mainDirection=codeFromKeyboard;
} else {
mapOfDirects[mainDirection]->direction(*this);
}
}
};
这里是我使用
KeyboardEvents
的类——snakeGame.hpp。#include"keyboardEvents.hpp"
class SnakeGame:public Screen, public KeyboardEvents<SnakeGame> {
public:
SnakeGame(int size=16, int width=15, int height=15, int timeDelay=60000)
: Screen(size, width, height), KeyboardEvents<SnakeGame>(), timeDelay(timeDelay) {}
};
SnakeGame
和KeyboardEvents
写在同一个文件里,但是现在我想重构这段代码,所以我把KeyboardEvents
移到了keyboardEvents.hpp
文件中 ;)。 - Klemensvirtual ~MyClass() = default
替代virtual ~MyClass(){}
。 - Guillaume Racicot