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feat: support all &/const&/&& variants

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ToruNiina
2021-05-15 20:41:11 +09:00
parent 4b1df61142
commit 891f68eab0
1 changed files with 30 additions and 7 deletions
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37
toml/get.hpp
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@@ -1038,25 +1038,48 @@ find_or(const basic_value<C, M, V>& v, const toml::key& ky, T&& opt)
return get_or(tab.at(ky), std::forward<T>(opt));
}
template<typename T, typename C,
template<typename ...> class M, template<typename ...> class V,
typename ... Ks,
// ---------------------------------------------------------------------------
// recursive find-or with type deduction (find_or(value, keys, opt))
template<typename Value, typename ... Ks,
typename detail::enable_if_t<(sizeof...(Ks) > 1), std::nullptr_t> = nullptr>
// here we need to add SFINAE in the template parameter to avoid
// infinite recursion in type deduction on gcc
auto find_or(const basic_value<C, M, V>& v, const toml::key& ky, Ks&& ... keys)
-> decltype(find_or<T>(v, ky, detail::last_one(std::forward<Ks>(keys)...)))
auto find_or(Value&& v, const toml::key& ky, Ks&& ... keys)
-> decltype(find_or(std::forward<Value>(v), ky, detail::last_one(std::forward<Ks>(keys)...)))
{
if(!v.is_table())
{
return detail::last_one(std::forward<Ks>(keys)...);
}
const auto& tab = v.as_table();
auto&& tab = std::forward<Value>(v).as_table();
if(tab.count(ky) == 0)
{
return detail::last_one(std::forward<Ks>(keys)...);
}
return find_or(tab.at(ky), std::forward<Ks>(keys)...);
return find_or(std::forward<decltype(tab)>(tab).at(ky), std::forward<Ks>(keys)...);
}
// ---------------------------------------------------------------------------
// recursive find_or with explicit type specialization, find_or<int>(value, keys...)
template<typename T, typename Value, typename ... Ks,
typename detail::enable_if_t<(sizeof...(Ks) > 1), std::nullptr_t> = nullptr>
// here we need to add SFINAE in the template parameter to avoid
// infinite recursion in type deduction on gcc
auto find_or(Value&& v, const toml::key& ky, Ks&& ... keys)
-> decltype(find_or<T>(std::forward<Value>(v), ky, detail::last_one(std::forward<Ks>(keys)...)))
{
if(!v.is_table())
{
return detail::last_one(std::forward<Ks>(keys)...);
}
auto&& tab = std::forward<Value>(v).as_table();
if(tab.count(ky) == 0)
{
return detail::last_one(std::forward<Ks>(keys)...);
}
return find_or(std::forward<decltype(tab)>(tab).at(ky), std::forward<Ks>(keys)...);
}
// ============================================================================