类中的C ++对象引用
我想知道如何在另一个对象内部存储对象的引用,并将该引用设置为私有属性.示例(伪代码):
I am wondering how to store a reference of an object inside of another object, and also set that reference as a private property. Example (pseudo-code):
class foo
{
public:
int size;
foo( int );
};
foo::foo( int s ) : size( s ) {}
class bar
{
public:
bar( foo& );
private:
foo fooreference;
};
bar::bar( foo & reference )
{
fooreference = reference;
}
foo firstclass( 1 );
bar secondclass( firstclass );
您可能会看到,我只想能够在此bar类中存储foo的引用.我知道如何简单地将其带入方法并仅在该方法的范围内使用它,但是在这里,我想将其设置为私有属性.我将如何去做?
As you may be able to see, I just want to be able to store the reference of foo inside this bar class. I know how to simply bring it into a method and use it just in the scope of that method, but here I want to set it as a private property. How would I go about doing this?
与定义和使用 any 类成员的方式相同.
The same way you define and use any class member.
确保使用_member-initialiser 初始化参考成员,而不是在构造函数主体中事后分配给它.记得引用必须被初始化,以后不能反弹.
Make sure you initialise the reference member with the _member-initialiser, instead of just assigning to it after-the-fact in the constructor body; recall that references must be initialised and cannot later be rebound.
class foo
{
public:
int size;
foo( int );
};
foo::foo( int s ) : size( s ) {}
class bar
{
public:
bar(foo&);
private:
foo& fooreference;
};
bar::bar(foo& reference) : fooreference(reference)
{}
foo firstclass(1);
bar secondclass(firstclass);