The standard’s policy on noexcept is to only mark functions that cannot or must not fail, but not those that simply are specified not to throw exceptions. In other words, all functions that have a limited domain (pass the wrong arguments and you get undefined behavior) are not noexcept, even when they are not specified … Read more
As T.C. demonstrated with some links in a comment, the standard is not quite clear on this; a similar problem arises with trailing return types using decltype(memberfunction()). The central problem is that class members are generally not considered to be declared until after the class in which they’re declared is complete. Thus, regardless of the … Read more
Exception specifiers were deprecated because exception specifiers are generally a terrible idea. noexcept was added because it’s the one reasonably useful use of an exception specifier: knowing when a function won’t throw an exception. Thus it becomes a binary choice: functions that will throw and functions that won’t throw. noexcept was added rather than just … Read more
Currently there is none. There is, however, a proposal on that topic, which proposes noexcept(auto) syntax: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4473 The status of this proposal is “needs further work”, according to Botond Ballo’s “Trip Report: C++ Standards Meeting in Lenexa, May 2015” https://botondballo.wordpress.com/2015/06/05/trip-report-c-standards-meeting-in-lenexa-may-2015/ Further Work. The proposal’s direction is promising, but it is either not fleshed out well … Read more
Exception specifiers were deprecated because exception specifiers are generally a terrible idea. noexcept was added because it’s the one reasonably useful use of an exception specifier: knowing when a function won’t throw an exception. Thus it becomes a binary choice: functions that will throw and functions that won’t throw. noexcept was added rather than just … Read more
I think it is too early to give a “best practices” answer for this as there hasn’t been enough time to use it in practice. If this was asked about throw specifiers right after they came out then the answers would be very different to now. Having to think about whether or not I need … Read more