Re: [boost] [scope] Some random thoughts

On 12/2/23 23:12, Andrzej Krzemienski via Boost wrote:

Hi All, Two observations from reading the docs.

Why do I need a condition in scope_exit when I have a scope_fail?

There is a discussion about this in this section: https://lastique.github.io/scope/libs/scope/doc/html/scope/scope_guards.html... In short, scope_fail implies processing a failure event (for whatever definition of "failure") and scope_exit has no such connotation and can be used with arbitrary conditions. The different scope guards have different default conditions, too. Internally, both scope_success and scope_fail are implemented on top of scope_exit and leverage its support for custom condition functions.

I recommend putting warning somewhere in the docs that while using scope guards you may inadvertently read an object after move:

std::string checked(std::string name) { scope::scope_exit g{[&]{ std::clog << "checked " << name <

validate(name); return name; // name becomes moved-from }

Interesting observation, thanks.