[英]Display inputs to std::ostream
Disclaimer : I am a complete C++ beginner, and if there is a similar answer to this question, please direct me to it, as I may have missed it, not knowing much in the way of theory. 免责声明 :我是一名完全的C ++初学者,如果对此问题有相似的答案,请直接向我介绍,因为我可能错过了,对理论的了解也不多。
Suppose I have a method which accepts a reference to an ostream
: 假设我有一个接受对ostream
的引用的方法:
printAllObjects(std::ostream& os);
I am assuming it makes changes to the ostream
, so that one can print the list of all of the objects to a file, say. 我假设它对ostream
进行了更改,以便可以将所有对象的列表打印到文件中。 (I might be wrong here) (我可能在这里错了)
Is there any way of seeing what it writes to the ostream
? 有什么办法查看它写入ostream
吗? (via cout
preferably)? (最好通过cout
)?
std::cout
is an std::ostream
, so just pass std::cout
to the function and you'll see what it does: std::cout
是 std::ostream
,因此只需将std::cout
传递给函数,您将看到它的作用:
printAllObjects(std::cout);
This flexibility is the very purpose of accepting a reference to std::ostream
! 这种灵活性正是接受对std::ostream
的引用的目的。
Other stream types 1 inheriting from the std::ostream
base include: 从std::ostream
基继承的其他流类型1包括:
std::ofstream
(for file output) std::ofstream
(用于文件输出) std::ostringstream
(for string output). std::ostringstream
(用于字符串输出)。 1 That's not to say that std::cout
is a type; 1这并不是说std::cout
是一种类型; it's not. 不是。 It's a special, global instance of std::ostream
. 这是std::ostream
的特殊全局实例。
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