有以下简化数据结构：
Object1.h
template <class T>
class Object1
{
private:
T a1;
T a2;
public:
T getA1() {return a1;}
};
Object2.h
template <class T>
class Object2: public Object1 <T>
{
private:
T b1;
T b2;
public:
T getB1() {return b1;}
}
Functions.h
template <class Object>
void (Object *o1,Object *o2)
{
T = o1.getA1(); //Is it possible to get T from object o1?
...
}
或者我们必须提供有关两个对象的数据类型的其他信息：
template <class T,class Object>
void (Object *o1,Object *o2)
{
T = o1.getA1();
...
}
解决方法
添加一个typedef：
template <class T>
class Object1
{
private:
T a1;
T a2;
public:
T getA1() {return a1;}
typedef T type;
};
template <class Object>
void foo(Object *o1,Object *o2)
{
typename Object::type x = o1.getA1();
...
}
