How to combine stringstream << and stringsteam.str() into one single line

std::ostringstream ostr; //output string stream
ostr << 123;
string str = ostr.str();

I know the above will work.

But I would like to combine the above two operation into a single line operation like below

string str = (ostr<<123).ToStr(); // not sure if there is to string function;

Can I clear the ostr before <<123? (of course in single line too)?
tommym121Asked:
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jkrCommented:
Sorry to say so, but you can't do that. This is because the expression 'ostr << 123' 'returns' a ostream reference, whose interface does not allow any read access to the object's contents.
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tommym121Author Commented:
Thanks
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evilrixSenior Software Engineer (Avast)Commented:
All you have to do is cast the ostream back to a ostringstream

std::string str = static_cast<std::ostringstream &>(ostr << 123).str();

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