This add a new template class scope_exit. scope_exit is a
general-purpose scope guard that calls its exit function at the end of
the current scope. A scope_exit may be canceled by calling the
"release" method. The API is modeled on P0052R5 - Generic Scope Guard
and RAII Wrapper for the Standard Library, which is itself based on
Andrej Alexandrescu's ScopeGuard/SCOPE_EXIT.
The main advantage of scope_exit is avoiding writing single-use RAII
classes and its boilerplate. Following patches will remove a few of
such classes.
There are two forms available:
- The "make_scope_exit" form allows canceling the scope guard. Use
it like this:
auto cleanup = make_scope_exit ( <function, function object, lambda> );
...
cleanup.release (); // cancel
- If you don't need to cancel the guard, you can use the SCOPE_EXIT
macro, like this:
SCOPE_EXIT { /* any code you like here. */ }
Note: scope_exit instances do not allocate anything on the heap.
gdb/ChangeLog:
2019-01-23 Pedro Alves <palves@redhat.com>
Andrew Burgess <andrew.burgess@embecosm.com>
Tom Tromey <tom@tromey.com>
* common/scope-exit.h: New file.
