value-categories – Tarik Billa

Why can I assign the result of a function returning a value? Is it an lvalue?

October 9, 2023 by Tarik

No, the return value of a function is an l-value if and only if it is a reference (C++03). (5.2.2 [expr.call] / 10) If the type returned were a basic type then this would be a compile error. (5.17 [expr.ass] / 1) The reason that this works is that you are allowed to call member … Read more

std::is_same different results between compilers

April 5, 2023 by Tarik

This is a gcc bug. The problem is that gcc incorrectly treats the expression !(!b) as an lvalue instead of rvalue. You can confirm this here. As you’ll see in the above linked demo, the output gcc gives is lvalue instead of prvalue. The bug has been reported as: GCC treats rvalue as an lvalue