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ircd::json::tuple: Optimize at() runtime reference template approach.

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This commit is contained in:
Jason Volk 2020-11-18 11:36:45 -08:00
parent a82b325341
commit 3412f3e6e3
1 changed files with 24 additions and 48 deletions
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72
include/ircd/json/tuple/at.h
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@ -97,9 +97,9 @@ at(tuple &t,
function&& f)
{
if(indexof<tuple>(name) == i)
f(val<i>(t));
else
at<tuple, function, i + 1>(t, name, std::forward<function>(f));
return f(val<i>(t));
at<tuple, function, i + 1>(t, name, std::forward<function>(f));
}
template<class tuple,
@ -121,9 +121,9 @@ at(const tuple &t,
function&& f)
{
if(indexof<tuple>(name) == i)
f(val<i>(t));
else
at<tuple, function, i + 1>(t, name, std::forward<function>(f));
return f(val<i>(t));
at<tuple, function, i + 1>(t, name, std::forward<function>(f));
}
template<class R,
@ -133,28 +133,16 @@ at(const tuple &t,
const string_view &name)
{
const R *ret;
const auto closure
at(t, name, [&ret]
(auto&& val)
noexcept
{
[&name, &ret](const auto &key, const auto &val) noexcept
{
if constexpr(std::is_assignable<R, decltype(val)>())
{
if(key == name)
{
ret = std::addressof(val);
return false;
}
else return true;
}
else return true;
}
};
if(unlikely(until(t, closure)))
throw not_found
{
"%s", name
};
//XXX is_pointer_interconvertible_base_of? (C++20)
if constexpr(std::is_assignable<R, decltype(val)>())
ret = std::addressof(val);
else
assert(false);
});
return *ret;
}
@ -166,28 +154,16 @@ at(tuple &t,
const string_view &name)
{
R *ret;
const auto closure
at(t, name, [&ret]
(auto &val)
noexcept
{
[&name, &ret](const auto &key, auto &val) noexcept
{
if constexpr(std::is_assignable<R, decltype(val)>())
{
if(key == name)
{
ret = std::addressof(val);
return false;
}
else return true;
}
else return true;
}
};
if(unlikely(until(t, closure)))
throw not_found
{
"%s", name
};
//XXX is_pointer_interconvertible_base_of? (C++20)
if constexpr(std::is_assignable<R, decltype(val)>())
ret = std::addressof(val);
else
assert(false);
});
return *ret;
}