73 lines
1.8 KiB
C++
73 lines
1.8 KiB
C++
#ifndef shared_string_hh_INCLUDED
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#define shared_string_hh_INCLUDED
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#include "string.hh"
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#include "utils.hh"
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#include "unordered_map.hh"
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#include <memory>
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namespace Kakoune
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{
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class SharedString : public StringView
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{
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public:
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using Storage = std::basic_string<char, std::char_traits<char>,
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Allocator<char, MemoryDomain::SharedString>>;
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SharedString() = default;
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SharedString(StringView str)
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{
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if (not str.empty())
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{
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m_storage = std::make_shared<Storage>(str.begin(), str.end());
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StringView::operator=(*m_storage);
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}
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}
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struct NoCopy{};
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SharedString(StringView str, NoCopy) : StringView(str) {}
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SharedString(const char* str) : SharedString(StringView{str}) {}
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SharedString acquire_substr(ByteCount from, ByteCount length = INT_MAX) const
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{
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return SharedString{StringView::substr(from, length), m_storage};
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}
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SharedString acquire_substr(CharCount from, CharCount length = INT_MAX) const
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{
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return SharedString{StringView::substr(from, length), m_storage};
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}
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private:
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SharedString(StringView str, std::shared_ptr<Storage> storage)
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: StringView{str}, m_storage(std::move(storage)) {}
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friend class StringRegistry;
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std::shared_ptr<Storage> m_storage;
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};
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inline size_t hash_value(const SharedString& str)
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{
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return hash_data(str.data(), (int)str.length());
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}
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class StringRegistry : public Singleton<StringRegistry>
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{
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public:
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void debug_stats() const;
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SharedString intern(StringView str);
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void purge_unused();
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private:
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UnorderedMap<StringView, std::shared_ptr<SharedString::Storage>, MemoryDomain::SharedString> m_strings;
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};
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inline SharedString intern(StringView str)
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{
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return StringRegistry::instance().intern(str);
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}
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}
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#endif // shared_string_hh_INCLUDED
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