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ircd::util: Add enum-flag accumulator util.

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This commit is contained in:
Jason Volk 2017-09-21 20:10:02 -07:00
parent dae391a578
commit 34be7b1d77
1 changed files with 22 additions and 0 deletions
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22
include/ircd/util.h
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@ -557,6 +557,28 @@ operator^=(Enum &a, const Enum &b)
return (a = (a ^ b));
}
template<class Enum,
class it>
typename std::enable_if<std::is_enum<Enum>::value, typename std::underlying_type<Enum>::type>::type
combine_flags(const it &begin,
const it &end)
{
using type = typename std::underlying_type<Enum>::type;
return std::accumulate(begin, end, type(0), []
(auto ret, const auto &val)
{
return ret |= type(val);
});
}
template<class Enum>
typename std::enable_if<std::is_enum<Enum>::value, typename std::underlying_type<Enum>::type>::type
combine_flags(const std::initializer_list<Enum> &list)
{
return combine_flags<Enum>(begin(list), end(list));
}
inline size_t
size(std::ostream &s)