const reference to stream object
Hi,everyone.
I am trying to use stream object reference as function arguments,like this:
void fun(const ostream& os, const istream& is);
but it keeps to give me errors. I remove the two const things works fine. How to understand this? As when we overload the <<(or >>) operators, we usually add const to stream objects. Thanks a lot.
I am trying to use stream object reference as function arguments,like this:
void fun(const ostream& os, const istream& is);
but it keeps to give me errors. I remove the two const things works fine. How to understand this? As when we overload the <<(or >>) operators, we usually add const to stream objects. Thanks a lot.
Right. Passing by const reference means you won't change the state of the object.
using << and >> either inserts or removes content from the stream. This alters its state -- which means you can't do it with a const object.
using << and >> either inserts or removes content from the stream. This alters its state -- which means you can't do it with a const object.
yes, that's right. I just checked old codes, I don't use const when overload operator <<
I may too love const :) thanks for clarifying.
I may too love const :) thanks for clarifying.
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