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ircd::util: Add scope::nominal and scope::exceptional constructs.

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This commit is contained in:
Jason Volk 2017-03-19 23:59:11 -07:00
parent 50b2942131
commit 95a52a4ab7
1 changed files with 38 additions and 21 deletions
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59
include/ircd/util.h
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@ -63,45 +63,62 @@ struct NAME \
IRCD_STRONG_TYPEDEF(TYPE, IRCD_UNIQUE(strong_t))
template<class T>
using custom_ptr = std::unique_ptr<T, std::function<void (T *) noexcept>>;
struct scope
{
struct uncaught;
struct nominal;
struct exceptional;
const std::function<void ()> func;
template<class F>
scope(F &&func)
:func(std::forward<F>(func))
{}
scope(F &&func): func(std::forward<F>(func)) {}
scope() = default;
scope(const scope &) = delete;
scope &operator=(const scope &) = delete;
~scope() noexcept
{
func();
}
};
struct scope::uncaught
struct scope::nominal
:scope
{
const std::function<void ()> func;
template<class F>
uncaught(F &&func)
:func(std::forward<F>(func))
{}
uncaught(const uncaught &) = delete;
~uncaught() noexcept
nominal(F &&func)
:scope
{
if(unlikely(std::uncaught_exception()))
func();
}
[func(std::forward<F>(func))]
{
if(likely(!std::uncaught_exception()))
func();
}
}{}
nominal() = default;
};
struct scope::exceptional
:scope
{
template<class F>
exceptional(F &&func)
:scope
{
[func(std::forward<F>(func))]
{
if(unlikely(std::uncaught_exception()))
func();
}
}{}
exceptional() = default;
};
template<class T>
using custom_ptr = std::unique_ptr<T, std::function<void (T *) noexcept>>;
// For conforming enums include a _NUM_ as the last element,
// then num_of<my_enum>() works