GT2/Ejectable/node_modules/react-native/ReactCommon/fabric/attributedstring/AttributedStringBox.h

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2021-08-16 00:14:59 +00:00
/*
* Copyright (c) Facebook, Inc. and its affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
#pragma once
#include <memory>
#include <react/attributedstring/AttributedString.h>
namespace facebook {
namespace react {
/*
* Represents an object storing a shared `AttributedString` or a shared pointer
* to some opaque platform-specific object that can be used as an attributed
* string. The class serves two main purposes:
* - Represent type-erased attributed string entity (which can be
* platform-specific or platform-independent);
* - Represent a container that can be copied with constant complexity.
*/
class AttributedStringBox final {
public:
enum class Mode { Value, OpaquePointer };
/*
* Default constructor constructs an empty string.
*/
AttributedStringBox();
/*
* Custom explicit constructors.
*/
explicit AttributedStringBox(AttributedString const &value);
explicit AttributedStringBox(std::shared_ptr<void> const &opaquePointer);
/*
* Movable, Copyable, Assignable.
*/
AttributedStringBox(AttributedStringBox const &other) = default;
AttributedStringBox(AttributedStringBox &&other) noexcept = default;
AttributedStringBox &operator=(AttributedStringBox const &other) = default;
AttributedStringBox &operator=(AttributedStringBox &&other) = default;
/*
* Getters.
*/
Mode getMode() const;
AttributedString const &getValue() const;
std::shared_ptr<void> getOpaquePointer() const;
private:
Mode mode_;
std::shared_ptr<AttributedString const> value_;
std::shared_ptr<void> opaquePointer_;
};
bool operator==(AttributedStringBox const &lhs, AttributedStringBox const &rhs);
bool operator!=(AttributedStringBox const &lhs, AttributedStringBox const &rhs);
} // namespace react
} // namespace facebook
template <>
struct std::hash<facebook::react::AttributedStringBox> {
size_t operator()(
facebook::react::AttributedStringBox const &attributedStringBox) const {
switch (attributedStringBox.getMode()) {
case facebook::react::AttributedStringBox::Mode::Value:
return std::hash<facebook::react::AttributedString>()(
attributedStringBox.getValue());
case facebook::react::AttributedStringBox::Mode::OpaquePointer:
return std::hash<std::shared_ptr<void>>()(
attributedStringBox.getOpaquePointer());
}
}
};