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ircd::util: Add tuple for_each iterator.

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Jason Volk 2017-03-20 18:04:19 -07:00
parent 26529b4ac6
commit 99eacb0932
1 changed files with 25 additions and 0 deletions
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25
include/ircd/util.h
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@ -120,6 +120,31 @@ template<class T>
using custom_ptr = std::unique_ptr<T, std::function<void (T *) noexcept>>; using custom_ptr = std::unique_ptr<T, std::function<void (T *) noexcept>>;
//
// Iteration of a tuple
//
// for_each(tuple, [](auto&& elem) { ... });
template<size_t i,
class func,
class... args>
typename std::enable_if<i == std::tuple_size<std::tuple<args...>>::value, void>::type
for_each(const std::tuple<args...> &t,
func&& f)
{}
template<size_t i = 0,
class func,
class... args>
typename std::enable_if<i < std::tuple_size<std::tuple<args...>>::value, void>::type
for_each(const std::tuple<args...> &t,
func&& f)
{
f(std::get<i>(t));
for_each<i+1>(t, std::forward<func>(f));
}
// For conforming enums include a _NUM_ as the last element, // For conforming enums include a _NUM_ as the last element,
// then num_of<my_enum>() works // then num_of<my_enum>() works
template<class Enum> template<class Enum>