Replace StringView with shared_ptr.

src/String/StringView.cpp

@@ -1,3 +1,7 @@
 #include "StringView.hpp"
+#include <memory>
 
-ArbUt::__ConstStringCharHolder* ArbUt::StringView::__emptyString = new __ConstStringCharHolder("", 0);
+namespace ArbUt {
+    std::shared_ptr<__ConstStringCharHolder> StringView::__emptyString =
+        std::make_shared<__ConstStringCharHolder>("", 0);
+}

src/String/StringView.hpp

@@ -5,6 +5,7 @@
 #include <cstddef>
 #include <cstdint>
 #include <cstring>
+#include <memory>
 #include <string>
 #include "BasicStringView.hpp"
 
@@ -17,26 +18,15 @@
 namespace ArbUt {
     class __ConstStringCharHolder {
         char* _value;
-        std::atomic<size_t> _references;
 
         __ConstStringCharHolder(const __ConstStringCharHolder& o) = delete;
         __ConstStringCharHolder& operator=(const __ConstStringCharHolder& other) = delete;
 
     public:
-        __ConstStringCharHolder(const char* value, size_t length) noexcept
-            : _value(new char[length + 1]), _references(1) {
+        __ConstStringCharHolder(const char* value, size_t length) noexcept : _value(new char[length + 1]) {
             strncpy(_value, value, length + 1);
         }
-
         ~__ConstStringCharHolder() noexcept { delete[] _value; }
-
-        inline void RemoveReference() noexcept {
-            if (--_references <= 0) {
-                delete this;
-            }
-        }
-
-        inline void AddReference() noexcept { _references++; }
         inline constexpr const char* GetValue() const noexcept { return _value; }
     };
 }
@@ -50,43 +40,33 @@ static int constexpr CalcLength(const char* str) { return *str ? 1 + CalcLength(
 namespace ArbUt {
     class StringView final : public BasicStringView {
     private:
-        static __ConstStringCharHolder* __emptyString;
-        static inline __ConstStringCharHolder* GetEmptyString() { return __emptyString; }
+        static std::shared_ptr<__ConstStringCharHolder> __emptyString;
+        static inline const std::shared_ptr<__ConstStringCharHolder>& GetEmptyString() { return __emptyString; }
 
-        __ConstStringCharHolder* _str;
-
-        inline __ConstStringCharHolder* CloneHolder() const noexcept {
-            _str->AddReference();
-            return _str;
-        }
+        std::shared_ptr<__ConstStringCharHolder> _str;
 
     public:
         StringView(const char* str) noexcept
             : BasicStringView(CalcLength(str), Hash(str)), _str(new __ConstStringCharHolder(str, CalcLength(str))) {}
         StringView(const char* str, size_t length) noexcept
             : BasicStringView(length, Hash(str)), _str(new __ConstStringCharHolder(str, length)) {}
-        StringView() noexcept : BasicStringView(0, Hash("")), _str(GetEmptyString()) { _str->AddReference(); }
+        StringView() noexcept : BasicStringView(0, Hash("")), _str(GetEmptyString()) {}
 
         /* Copy operators */
-        StringView(const StringView& other) noexcept
-            : BasicStringView(other._length, other._hash), _str(other.CloneHolder()) {}
+        StringView(const StringView& other) noexcept : BasicStringView(other._length, other._hash), _str(other._str) {}
         StringView(const BasicStringView& other, const char* c, size_t length) noexcept
             : BasicStringView(length, other.GetHash()), _str(new __ConstStringCharHolder(c, length)) {}
 
         StringView& operator=(const StringView& other) noexcept {
             if (_str == other._str) {
-                _str->AddReference();
                 return *this;
             }
-            _str->RemoveReference();
-            _str = other.CloneHolder();
+            _str = other._str;
             _length = other._length;
             _hash = other._hash;
             return *this;
         }
 
-        ~StringView() noexcept { _str->RemoveReference(); }
-
         [[nodiscard]] inline constexpr const char* c_str() const noexcept override { return _str->GetValue(); }
         [[nodiscard]] inline std::string_view std_str() const noexcept override { return _str->GetValue(); }
 
@@ -99,8 +79,11 @@ namespace ArbUt {
         inline constexpr bool operator==(const char* rhs) const noexcept override { return _hash == Hash(rhs); }
         inline constexpr bool operator!=(const char* rhs) const noexcept override { return _hash != Hash(rhs); }
 
-        inline static constexpr uint32_t CalculateHash(const char* val) noexcept { return Hash(val); }
-        inline static constexpr uint32_t CalculateHash(const std::string_view& val) noexcept {
+        [[maybe_unused]] [[nodiscard]] inline static constexpr uint32_t CalculateHash(const char* val) noexcept {
+            return Hash(val);
+        }
+        [[maybe_unused]] [[nodiscard]] inline static constexpr uint32_t
+        CalculateHash(const std::string_view& val) noexcept {
             return Hash(val.data());
         }
     };