[英]How to use arguments from constructor to call a constructor of another class in C++?
I have a question. 我有个问题。 I want to call a constructor of "gameWindow" from the class "Game". 我想从类“ Game”中调用“ gameWindow”的构造函数。 The problem is that if I call it from the constructor it is initialising as a local variable (example A), if I define it in as a private member - I can not use arguments of a constructor. 问题是,如果我从构造函数中调用它,则它将初始化为局部变量(示例A),如果我将其定义为私有成员,则无法使用构造函数的参数。 How can I make gamewindowObj as a member from a constructor? 我怎样才能使gamewindowObj作为构造函数的成员?
//example А //示例А
class Game{
public:
Game(int inWidth, int inHeight, char const * Intitle);
};
Game::Game(int inWidth, int inHeight, char const * Intitle){
gameWindow gamewindowObj=gameWindow(inWidth, inHeight, Intitle);
}
//example В //示例В
class Game{
public:
Game(int inWidth, int inHeight, char const * Intitle);
private:
gameWindow gamewindowObj=gameWindow(inWidth, inHeight, Intitle);
};
Game::Game(int inWidth, int inHeight, char const * Intitle){}
If you want gamewindowObj
to be a data member and be initialized by the constructor's arguments, you can use member initializer list , eg 如果希望gamewindowObj
成为数据成员并通过构造函数的参数进行初始化,则可以使用成员初始化列表 ,例如
class Game{
public:
Game(int inWidth, int inHeight, char const * Intitle);
private:
gameWindow gamewindowObj;
};
Game::Game(int inWidth, int inHeight, char const * Intitle)
: gamewindowObj(inWidth, inHeight, Intitle) {
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
}
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