https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102116
Bug ID: 102116
Summary: structured binding is returned from a function as
rvalue in C++20 mode
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: fchelnokov at gmail dot com
Target Milestone: ---
In the following program:
```
#include <tuple>
#include <iostream>
struct A {
A(const int &) { std::cout << "A(const int &) "; }
A(int &&) { std::cout << "A(int &&) "; }
};
A foo() {
auto [y] = std::make_tuple(1);
return y;
}
int main() { foo(); }
```
GCC selects "A(int &&)" constructor starting from C++20 mode, demo:
https://gcc.godbolt.org/z/5q779vE6T
I asked why on stack-overflow:
https://stackoverflow.com/questions/68941451/shall-structured-binding-be-returned-from-a-function-as-rvalue-in-c20
and the answer was that GCC being wrong here.
Could you please confirm it or explain why the behavior of the program changes
in C++20 mode?
