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ircd::util: Add unwind utils that assert whether exception is taking place.

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This commit is contained in:
Jason Volk 2018-03-14 20:21:51 -07:00
parent ffafb70511
commit 6dc834b9c9
1 changed files with 29 additions and 0 deletions
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29
include/ircd/util/unwind.h
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@ -49,6 +49,8 @@ struct ircd::util::unwind
///
struct ircd::util::unwind::nominal
{
struct assertion;
const std::function<void ()> func;
template<class F>
@ -74,6 +76,8 @@ struct ircd::util::unwind::nominal
///
struct ircd::util::unwind::exceptional
{
struct assertion;
const std::function<void ()> func;
template<class F>
@ -89,3 +93,28 @@ struct ircd::util::unwind::exceptional
exceptional(const exceptional &) = delete;
};
/// 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
/// exception is expected thus placing other guarantees should not be required
/// if this guarantee is met.
///
struct ircd::util::unwind::nominal::assertion
{
~assertion() noexcept
{
assert(likely(!std::uncaught_exception()));
}
};
/// Complements exceptional::assertion. This triggers an assertion when
/// unwinding WITHOUT an exception.
///
struct ircd::util::unwind::exceptional::assertion
{
~assertion() noexcept
{
assert(likely(std::uncaught_exception()));
}
};