有模板的运算符重载operator<< 该如何调用？
考虑这个例子
template <unsigned dim>
class R_Tree{

};

template <unsigned dim>
ostream& operator < <(ostream &o,R_Tree <dim> &rt)
{
rt.print(o);
return o;
}

[解决办法]
你到底想问啥？
R_Tree <int> x;
cout < < x;即可。
[解决办法]
#include <iostream>
using namespace std;

template <typename T>
class R_Tree
{
public:
R_Tree(T a) : a_(a) {}
ostream& print(ostream& o)
{
o < < a_;
return o;
}

private:
T a_;
};

template <typename T>
ostream& operator < <(ostream &o, const R_Tree <T> &rt)
{
return rt.print(o);
}


int main()
{
R_Tree <int> val(10);
cout < < val < < endl;

return getchar();
}
[解决办法]
VC6墨板的支持不好，用VC2003， VC2005，MinGW, DevCpp……
[解决办法]
把HappyTree(笨笨天行健)程序
template <typename T>
ostream& operator < <(ostream &o, R_Tree <T> &rt)
{
return rt.print(o);
}
去掉const
就可以正确运行