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ircd::json: Add key filtering for tuple enumerations.

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This commit is contained in:
Jason Volk 2017-12-12 13:22:41 -07:00
parent 5b2facd8e3
commit ff76d3e061
1 changed files with 79 additions and 0 deletions
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79
include/ircd/json/tuple.h
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@ -60,6 +60,7 @@ struct tuple
:std::tuple<T...>
,tuple_base
{
struct keys;
using tuple_type = std::tuple<T...>;
using super_type = tuple<T...>;
@ -960,6 +961,84 @@ _key_transform(const tuple<T...> &tuple,
return it;
}
template<class... T>
struct tuple<T...>::keys
:std::array<string_view, tuple<T...>::size()>
{
struct selection;
struct include;
struct exclude;
constexpr keys()
{
_key_transform<tuple<T...>>(this->begin(), this->end());
}
};
template<class... T>
struct tuple<T...>::keys::selection
:std::bitset<tuple<T...>::size()>
{
template<class closure>
constexpr bool until(closure &&function) const
{
for(size_t i(0); i < this->size(); ++i)
if(this->test(i))
if(!function(key<tuple<T...>, i>()))
return false;
return true;
}
template<class closure>
constexpr void for_each(closure &&function) const
{
this->until([&function](auto&& key)
{
function(key);
return true;
});
}
template<class it_a,
class it_b>
constexpr auto transform(it_a it, const it_b end) const
{
this->until([&it, &end](auto&& key)
{
if(it == end)
return false;
*it = key;
++it;
return true;
});
}
};
template<class... T>
struct tuple<T...>::keys::include
:selection
{
constexpr include(const std::initializer_list<string_view> &list)
{
for(const auto &key : list)
this->set(indexof<tuple<T...>>(key), true);
}
};
template<class... T>
struct tuple<T...>::keys::exclude
:selection
{
constexpr exclude(const std::initializer_list<string_view> &list)
{
this->set();
for(const auto &key : list)
this->set(indexof<tuple<T...>>(key), false);
}
};
template<class it_a,
class it_b,
class closure,