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ircd::util: Follow up for_each() with tuple until().

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This commit is contained in:
Jason Volk 2017-03-20 19:13:12 -07:00
parent fdfefff72e
commit e061f7326f
1 changed files with 25 additions and 0 deletions
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25
include/ircd/util.h
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@ -145,6 +145,31 @@ for_each(const std::tuple<args...> &t,
}
//
// Iteration of a tuple until() style: your closure returns true to continue, false
// to break. until() then remains true to the end, or returns false if not.
template<size_t i,
class func,
class... args>
typename std::enable_if<i == std::tuple_size<std::tuple<args...>>::value, bool>::type
until(const std::tuple<args...> &t,
func&& f)
{
return true;
}
template<size_t i = 0,
class func,
class... args>
typename std::enable_if<i < std::tuple_size<std::tuple<args...>>::value, bool>::type
until(const std::tuple<args...> &t,
func&& f)
{
return f(std::get<i>(t))? until<i+1>(t, std::forward<func>(f)) : false;
}
// For conforming enums include a _NUM_ as the last element,
// then num_of<my_enum>() works
template<class Enum>