问题描述
我希望我可以使用cout<< .对于stl设计器来说，实现起来似乎并不那么困难:假设<< T定义为T，<<因为容器可以只遍历元素并使用ofstream<<打印它们.
I wish I could just print contents of a set/vector/map by using cout << . It doesn't seem so difficult for the stl designers to implement : Assuming that << is defined for T, << for a container could just iterate through the elements and print them using ofstream << .
有没有一种我不知道的简单打印方法?
Is there an easy way to print them that I dont know of?
如果没有，是否有简单的解决方案?我读过一些地方，扩展stl类不是一个好主意.是这样，为什么?
If not, Is there an easy solution? I have read at places that extending stl classes is a bad idea. Is that so, and why?
如何定义类似重载打印功能的内容?我正在寻找一个可以处理...的容器的递归函数我同意不同的人会喜欢不同的格式，但是可以覆盖的东西总比没有好
how about defining an something like an overloaded print function?I am looking for a recursive function which can handle containers of containers of ...I agree that different people would like different formats, but something overridable is better than nothing
推荐答案
可能最简单的输出STL容器的方法是
Probably the easiest way to output an STL container is
std::copy(cont.begin(), cont.end(),
std::ostream_iterator<Type>(std::cout, " "));
其中Type是cont元素的类型(例如，如果cont是std::vector<int>类型，则Type必须是int).
where Type is the type of the elements of cont (e.g. if cont is of type std::vector<int> then Type must be int).
当然，您可以使用任何ostream代替std::cout.
Of course instead of std::cout you can use any ostream.
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