mirror of
https://github.com/SerenityOS/serenity
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1d4f287582
This implements a FlyString that will de-duplicate String instances. The FlyString will store the raw encoded data of the String instance: If the String is a short string, FlyString holds the String::ShortString bytes; otherwise FlyString holds a pointer to the Detail::StringData. FlyString itself does not know about String's storage or how to refcount its Detail::StringData. It defers to String to implement these details.
74 lines
1.8 KiB
C++
74 lines
1.8 KiB
C++
/*
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* Copyright (c) 2023, Tim Flynn <trflynn89@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Error.h>
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#include <AK/Format.h>
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#include <AK/Platform.h>
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#include <AK/String.h>
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#include <AK/Traits.h>
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#include <AK/Types.h>
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namespace AK {
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class FlyString {
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public:
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FlyString();
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~FlyString();
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static ErrorOr<FlyString> from_utf8(StringView);
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explicit FlyString(String const&);
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FlyString(FlyString const&);
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FlyString& operator=(FlyString const&);
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FlyString(FlyString&&);
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FlyString& operator=(FlyString&&);
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[[nodiscard]] bool is_empty() const;
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[[nodiscard]] unsigned hash() const;
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explicit operator String() const;
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String to_string() const;
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[[nodiscard]] Utf8View code_points() const;
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[[nodiscard]] ReadonlyBytes bytes() const;
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[[nodiscard]] StringView bytes_as_string_view() const;
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[[nodiscard]] bool operator==(FlyString const& other) const;
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[[nodiscard]] bool operator==(String const&) const;
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[[nodiscard]] bool operator==(StringView) const;
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[[nodiscard]] bool operator==(char const*) const;
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static void did_destroy_fly_string_data(Badge<Detail::StringData>, StringView);
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[[nodiscard]] uintptr_t data(Badge<String>) const;
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// This is primarily interesting to unit tests.
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[[nodiscard]] static size_t number_of_fly_strings();
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private:
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// This will hold either the pointer to the Detail::StringData it represents or the raw bytes of
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// an inlined short string.
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uintptr_t m_data { 0 };
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};
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template<>
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struct Traits<FlyString> : public GenericTraits<FlyString> {
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static unsigned hash(FlyString const&);
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};
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template<>
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struct Formatter<FlyString> : Formatter<StringView> {
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ErrorOr<void> format(FormatBuilder&, FlyString const&);
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};
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}
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#if USING_AK_GLOBALLY
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using AK::FlyString;
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#endif
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