temporaries

I have been coding in C++ for past few years. But there is one question that I have not been able to figure out. I want to ask, are all temporaries in C++, rvalues? If no, can anyone provide me an example where temporary produced in the code is an lvalue ? No. The C++ language specification never makes such a straightforward assertion as the one you are asking about. It doesn't say anywhere in the language standard that "all temporary objects are rvalues". Moreover, the question itself is a bit of misnomer, since the property of being an rvalue in the C++ language is not a property of an

I'm told that, in C++03, temporaries are implicitly non-modifiable. However, the following compiles for me on GCC 4.3.4 (in C++03 mode): cout << static_cast<stringstream&>(stringstream() << 3).str(); How is this compiling? (I am not talking about the rules regarding temporaries binding to references.) fredoverflow I'm told that, in C++03, temporaries are implicitly non-modifiable. That is not correct. Temporaries are created, among other circumstances, by evaluating rvalues, and there are both non-const rvalues and const rvalues. The value category of an expression and the constness of the