http://open-std.org/JTC1/SC22/WG21/docs/papers/2014/n4152.pdf

http://open-std.org/JTC1/SC22/WG21/docs/papers/2013/n3614.pdf

Bristol 2013: Voutilainen pointed out that there are previous proposals on similar facilities (http://open-std.org/JTC1/SC22/WG21/docs/papers/2009/n2952.html), and that there's existing practice that is different from this proposal (existing practice returns an int, not a bool). Stroustrup thought that he would need convincing examples about the int, and thought that the facility in general needs better motivation. Voutilainen said that it would be best to create a revisions/synthesis paper that covers the existing practice and the previous proposals and improves the motivational examples.

Author is encouraged to revise.

In Chicago 2013, Voutilainen said he plans to work on this issue and create a follow-up paper for C++17.

Adopted into the working draft in Urbana, as N4259.