Will there be standardization of scope guard/scope exit idioms?

Question

Running a lambda on scope exit seems like such a basic thing, I would expect it to be standardized. Things like unique_ptr are better, when they apply, but I find there is an endless supply of "one-off" destructors are needed, especially when leveraging C-style libraries. Does anyone know if this is coming?

Answer 1

n4189 is a proposal to add make_scope_exit wrappers, and other similar resource handlers, to the language. It is based off of the relatively famous scope_guard talk.

The most recent "current paper status" from LWG is in 2013, prior to the above date.

The contents of C++1z (hopefully C++17) are yet to be determined.

C++1z status for clang does not mention it. C++1z TS for clang does not mention it.

The paper itself contains an example implementation. I do not know what licensing terms it is under.

Answer 2

It would appear that the current version of the scope exit paper, P0052, will be going into the Library Fundamentals v3, for likely adoption in the Post-C++17 standard.

In short, not gonna happen for C++17. Sorry.