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ircd::util: Add an unwind::defer device.

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This commit is contained in:
Jason Volk 2019-04-18 05:46:07 -07:00
parent 5232893c6a
commit c6a59ab6b1
2 changed files with 31 additions and 0 deletions
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17
include/ircd/util/unwind.h
View file

@ -24,6 +24,7 @@ namespace ircd::util
///
struct ircd::util::unwind
{
struct defer;
struct nominal;
struct exceptional;
@ -94,6 +95,22 @@ struct ircd::util::unwind::exceptional
exceptional(const exceptional &) = delete;
};
/// Posts function to the event loop at the unwind rather than executing it
/// as with nominal/exceptional.
///
struct ircd::util::unwind::defer
{
std::function<void ()> func;
template<class F>
defer(F&& func)
:func{std::forward<F>(func)}
{}
defer(const defer &) = delete;
~defer() noexcept;
};
/// Asserts that unwind is occurring without any exception. This allows some
/// section of code, for example, the latter half of a function, to assert that
/// it is not throwing and disrupting the other half. This is useful when no

14
ircd/util.cc
View file

@ -582,6 +582,20 @@ ircd::util::a2u(const mutable_buffer &out,
return { data(out), len };
}
///////////////////////////////////////////////////////////////////////////////
//
// util/unwind.h
//
ircd::util::unwind::defer::~defer()
noexcept
{
ircd::defer
{
std::move(func)
};
}
///////////////////////////////////////////////////////////////////////////////
//
// util/what.h