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meta: make meta_dispatch support and use meta contexts

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This commit is contained in:
Michele Caini
2022-10-10 15:04:29 +02:00
parent c3a2a44830
commit 2739964a1f
1 changed files with 18 additions and 5 deletions
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23
src/entt/meta/utility.hpp
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@@ -152,24 +152,37 @@ using meta_function_helper_t = typename meta_function_helper<Type, Candidate>::t
* @brief Wraps a value depending on the given policy.
* @tparam Policy Optional policy (no policy set by default).
* @tparam Type Type of value to wrap.
* @param ctx The context from which to search for meta types.
* @param value Value to wrap.
* @return A meta any containing the returned value, if any.
*/
template<typename Policy = as_is_t, typename Type>
meta_any meta_dispatch([[maybe_unused]] Type &&value) {
meta_any meta_dispatch(const meta_ctx &ctx, [[maybe_unused]] Type &&value) {
if constexpr(std::is_same_v<Policy, as_void_t>) {
return meta_any{std::in_place_type<void>};
return meta_any{ctx, std::in_place_type<void>};
} else if constexpr(std::is_same_v<Policy, as_ref_t>) {
return meta_any{std::in_place_type<Type>, value};
return meta_any{ctx, std::in_place_type<Type>, value};
} else if constexpr(std::is_same_v<Policy, as_cref_t>) {
static_assert(std::is_lvalue_reference_v<Type>, "Invalid type");
return meta_any{std::in_place_type<const std::remove_reference_t<Type> &>, std::as_const(value)};
return meta_any{ctx, std::in_place_type<const std::remove_reference_t<Type> &>, std::as_const(value)};
} else {
static_assert(std::is_same_v<Policy, as_is_t>, "Policy not supported");
return meta_any{std::forward<Type>(value)};
return meta_any{ctx, std::forward<Type>(value)};
}
}
/**
* @brief Wraps a value depending on the given policy.
* @tparam Policy Optional policy (no policy set by default).
* @tparam Type Type of value to wrap.
* @param value Value to wrap.
* @return A meta any containing the returned value, if any.
*/
template<typename Policy = as_is_t, typename Type>
meta_any meta_dispatch(Type &&value) {
return meta_dispatch<Policy, Type>(locator<meta_ctx>::value_or(), std::forward<Type>(value));
}
/**
* @brief Returns the meta type of the i-th element of a list of arguments.
* @tparam Type Type list of the actual types of arguments.