[cpp] 函数的默认参数

[marryme]

最近开始学习泛型编程，遇到了一个函数的默认参数的问题，具体如下：
template<class T, class ForwardIterator=T::iterator>
class print
{
   operator()(T& coll, ForwrdItrator it=coll.begin())

   {
        copy(it,coll.end(),ostream_iterator<T::value_type>(std::cout," "));
   }
}
//现在我已经有了一个list<int> a;
print(a);//编译不能通过，提示begin()找不道所属的class sturct
print(a,a.begin());//编译通过
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