在我的class
实现中,我有这样的事情:
基类
class swcWidget :
public swcRectangle
{
public:
swcWidget();
virtual ~swcWidget();
void update(float dt);
protected:
inline virtual void oPaintOnTop() { }
private:
};
派生类
class swcButton :
public swcWidget
,public swcText
{
public:
swcButton();
virtual ~swcButton();
static const int DEFAULT_SIZE = 20;
protected:
private:
void oPaintOnTop();
};
class swcApplication
{
public:
swcApplication(int argc, char *argv[]);
virtual ~swcApplication();
int run();
struct Controls
{
typedef std::vector<swcWidget*> vWidgets; //option 1
~Controls();
/////////////////////////////////
// M A I N P R O B L E M //
/////////////////////////////////
void add(swcWidget &&widgets); //most preferred option
//but gets demoted to base class.
void add(swcWidget *widgets); //second choice
//but should I make a copy of it?
//or just make a reference to it?
//and this one does what I wanted to.
//but still unsure on other things I don't know
void add(swcWidget *&&widgets); //this compiles fine (?)
//I don't know what kind of disaster I can make into this, but still does not do what I wanted.
inline vWidgets &getWidgets() {
return widgets;
}
private:
vWidgets widgets;
};
Controls controls;
};
我知道一些这样的工作选项:
使
swcApplication::Controls::widgets
作为类型
std::vector<std::shared_ptr<swcWidget>>
但我的代码将绑定到std::shared_ptr
,我不能像这样简单的语法:
swcButton btn;
app.controls.add(std::move(btn));
示例用法:
主文件
int main(int argc, char *argv[])
{
swcApplication app(argc, argv);
app.windows.create(640, 480);
if (font->load("fonts\\georgia.fnt") != BMfont_Status::BMF_NO_ERROR)
{
puts("failed to load \"georgia.fnt\"");
}
{
swcButton btn;
btn.setPosition(100, 100);
btn.setFont(font);
btn.text = "Ey!";
app.controls.add(std::move(&btn));
// btn.text = "Oy!";
}
return app.run();
}
更新:
这是暂时的定义,swcApplication::Controls::add()
尽管它可能仍会有所不同
void swcApplication::Controls::add(swcWidget &&widget)
{
widgets.push_back(std::move(widget));
}