tmp/tmprucbzk45/{from.md → to.md}
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## Deprecated type traits <a id="depr.meta.types">[[depr.meta.types]]</a>
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The header `<type_traits>` has the following addition:
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``` cpp
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namespace std {
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template <class T> struct is_literal_type;
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template <class T> constexpr bool is_literal_type_v = is_literal_type<T>::value;
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template <class> struct result_of; // not defined
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template <class Fn, class... ArgTypes> struct result_of<Fn(ArgTypes...)>;
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template <class T> using result_of_t = typename result_of<T>::type;
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}
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```
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*Requires:* For `is_literal_type`, `remove_all_extents_t<T>` shall be a
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complete type or cv `void`. For `result_of<Fn(ArgTypes...)>`, `Fn` and
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all types in the parameter pack `ArgTypes` shall be complete types,
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cv `void`, or arrays of unknown bound.
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`is_literal_type<T>` is a `UnaryTypeTrait` ([[meta.rqmts]]) with a base
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characteristic of `true_type` if `T` is a literal type (
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[[basic.types]]), and `false_type` otherwise. The partial specialization
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`result_of<Fn(ArgTypes...)>` is a `TransformationTrait` whose member
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typedef `type` is defined if and only if
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`invoke_result<Fn, ArgTypes...>::type` is defined. If `type` is defined,
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it names the same type as `invoke_result_t<Fn, ArgTypes...>`.
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The behavior of a program that adds specializations for
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`is_literal_type` or `is_literal_type_v` is undefined.
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