79 lines
2.4 KiB
C
79 lines
2.4 KiB
C
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/*
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#pragma once
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#include <memory>
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#include <react/renderer/attributedstring/AttributedString.h>
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namespace facebook::react {
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/*
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* Represents an object storing a shared `AttributedString` or a shared pointer
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* to some opaque platform-specific object that can be used as an attributed
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* string. The class serves two main purposes:
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* - Represent type-erased attributed string entity (which can be
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* platform-specific or platform-independent);
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* - Represent a container that can be copied with constant complexity.
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*/
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class AttributedStringBox final {
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public:
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enum class Mode { Value, OpaquePointer };
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/*
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* Default constructor constructs an empty string.
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*/
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AttributedStringBox();
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/*
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* Custom explicit constructors.
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*/
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explicit AttributedStringBox(const AttributedString& value);
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explicit AttributedStringBox(std::shared_ptr<void> opaquePointer);
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/*
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* Movable, Copyable, Assignable.
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*/
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AttributedStringBox(const AttributedStringBox& other) = default;
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AttributedStringBox(AttributedStringBox&& other) noexcept;
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AttributedStringBox& operator=(const AttributedStringBox& other) = default;
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AttributedStringBox& operator=(AttributedStringBox&& other) noexcept;
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/*
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* Getters.
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*/
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Mode getMode() const;
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const AttributedString& getValue() const;
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std::shared_ptr<void> getOpaquePointer() const;
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private:
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Mode mode_;
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std::shared_ptr<const AttributedString> value_;
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std::shared_ptr<void> opaquePointer_;
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};
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bool operator==(const AttributedStringBox& lhs, const AttributedStringBox& rhs);
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bool operator!=(const AttributedStringBox& lhs, const AttributedStringBox& rhs);
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} // namespace facebook::react
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template <>
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struct std::hash<facebook::react::AttributedStringBox> {
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size_t operator()(
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const facebook::react::AttributedStringBox& attributedStringBox) const {
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switch (attributedStringBox.getMode()) {
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case facebook::react::AttributedStringBox::Mode::Value:
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return std::hash<facebook::react::AttributedString>()(
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attributedStringBox.getValue());
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case facebook::react::AttributedStringBox::Mode::OpaquePointer:
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return std::hash<std::shared_ptr<void>>()(
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attributedStringBox.getOpaquePointer());
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}
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}
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};
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