mirror of
https://github.com/simdjson/simdjson
synced 2026-06-08 17:27:07 +00:00
M. Bahoosh
6e61b7f6ef
* Making `tag_invoke` to support `ondemand::document` as well + docs * Fix typos and doc update by @lemire Co-authored-by: Daniel Lemire <daniel@lemire.me> * Better docs by @lemire Co-authored-by: Daniel Lemire <daniel@lemire.me> * Preserving the old, disallowing in the new I'm disabling `document::get() &&` if the user has provided a `tag_invoke`d version; otherwise, we retain the compatibility. --------- Co-authored-by: Daniel Lemire <daniel@lemire.me>
101 lines
3.0 KiB
C++
101 lines
3.0 KiB
C++
#ifndef SIMDJSON_ONDEMAND_DESERIALIZE_H
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#define SIMDJSON_ONDEMAND_DESERIALIZE_H
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#include "simdjson/error.h"
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#ifdef __has_include
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#if __has_include(<version>)
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#include <version>
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#endif
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#endif
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#ifdef __cpp_concepts
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#include <utility>
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#endif
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namespace simdjson {
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#ifdef __cpp_concepts
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namespace tag_invoke_fn_ns {
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void tag_invoke();
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struct tag_invoke_fn {
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template <typename Tag, typename... Args>
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requires requires(Tag tag, Args &&...args) {
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tag_invoke(std::forward<Tag>(tag), std::forward<Args>(args)...);
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}
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constexpr auto operator()(Tag tag, Args &&...args) const
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noexcept(noexcept(tag_invoke(std::forward<Tag>(tag),
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std::forward<Args>(args)...)))
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-> decltype(tag_invoke(std::forward<Tag>(tag),
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std::forward<Args>(args)...)) {
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return tag_invoke(std::forward<Tag>(tag), std::forward<Args>(args)...);
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}
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};
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} // namespace tag_invoke_fn_ns
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inline namespace tag_invoke_ns {
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inline constexpr tag_invoke_fn_ns::tag_invoke_fn tag_invoke = {};
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} // namespace tag_invoke_ns
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template <typename Tag, typename... Args>
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concept tag_invocable = requires(Tag tag, Args... args) {
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tag_invoke(std::forward<Tag>(tag), std::forward<Args>(args)...);
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};
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template <typename Tag, typename... Args>
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concept nothrow_tag_invocable =
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tag_invocable<Tag, Args...> && requires(Tag tag, Args... args) {
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{
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tag_invoke(std::forward<Tag>(tag), std::forward<Args>(args)...)
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} noexcept;
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};
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template <typename Tag, typename... Args>
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using tag_invoke_result =
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std::invoke_result<decltype(tag_invoke), Tag, Args...>;
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template <typename Tag, typename... Args>
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using tag_invoke_result_t =
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std::invoke_result_t<decltype(tag_invoke), Tag, Args...>;
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template <auto &Tag> using tag_t = std::decay_t<decltype(Tag)>;
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namespace SIMDJSON_IMPLEMENTATION {
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namespace ondemand {
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class value;
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class document;
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}
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} // namespace SIMDJSON_IMPLEMENTATION
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/// Deserialize Tag
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inline constexpr struct deserialize_tag {
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using value_type = SIMDJSON_IMPLEMENTATION::ondemand::value;
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using document_type = SIMDJSON_IMPLEMENTATION::ondemand::document;
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// Customization Point for value
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template <typename T>
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requires tag_invocable<deserialize_tag, std::type_identity<T>, value_type&>
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[[nodiscard]] constexpr simdjson_result<T>
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operator()(std::type_identity<T>, value_type &object) const
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noexcept(nothrow_tag_invocable<deserialize_tag, std::type_identity<T>, value_type&>) {
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return tag_invoke(*this, std::type_identity<T>{}, object);
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}
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// Customization Point for document
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template <typename T>
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requires tag_invocable<deserialize_tag, std::type_identity<T>, document_type&>
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[[nodiscard]] constexpr simdjson_result<T>
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operator()(std::type_identity<T>, document_type &object) const
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noexcept(nothrow_tag_invocable<deserialize_tag, std::type_identity<T>, document_type&>) {
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return tag_invoke(*this, std::type_identity<T>{}, object);
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}
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// default implementations can also be done here
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} deserialize{};
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#endif
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} // namespace simdjson
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#endif // SIMDJSON_ONDEMAND_DESERIALIZE_H
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