写了一个超级叼的String. UTF32 + PureASCII + SSO, element语义为codepoint

src/Core/StringTest.cpp

@@ -0,0 +1,68 @@
+#include <iostream>
+#include <unordered_map>
+#include "String.hpp"
+
+using namespace Fig::StringClass::DynamicCapacity;
+
+int main()
+{
+    std::cout << "=== String Test ===\n";
+
+    // 1. 构造
+    String s1("Hello");
+    String s2("World");
+    String s3(U"你好世界"); // UTF-8中文
+
+    std::cout << "s1: " << s1.toBasicString() << "\n";
+    std::cout << "s2: " << s2.toBasicString() << "\n";
+    std::cout << "s3: " << s3.toBasicString() << "\n";
+
+    // 2. operator+
+    String s4 = s1 + String(", ") + s2;
+    std::cout << "s4 (s1 + ', ' + s2): " << s4.toBasicString() << "\n";
+
+    // 3. operator+=
+    s1 += String("!!!");
+    std::cout << "s1 after += '!!!': " << s1.toBasicString() << "\n";
+
+    // 4. operator==
+    std::cout << "s1 == 'Hello!!!'? " << (s1 == String("Hello!!!") ? "true" : "false") << "\n";
+    std::cout << "s1 == s2? " << (s1 == s2 ? "true" : "false") << "\n";
+
+    // 5. set / at / operator[]
+    s2.set(0, 'w'); // 'World' -> 'world'
+    std::cout << "s2 after set(0,'w'): " << s2.toBasicString() << "\n";
+    std::cout << "s2.at(1): " << String(s2.at(1)).toBasicString() << "\n";
+    std::cout << "s2[2]: " << String(s2[2]).toBasicString() << "\n";
+
+    // 6. reverse
+    s1.reverse();
+    std::cout << "s1 reversed: " << s1.toBasicString() << "\n";
+
+    // 7. clear
+    s3.clear();
+    std::cout << "s3 cleared, empty? " << (s3.empty() ? "true" : "false") << "\n";
+
+    // 8. reserve & shrink_to_fit
+    s4.reserve(100);
+    std::cout << "s4 reserved 100, length: " << s4.length() << "\n";
+    s4.shrink_to_fit();
+    std::cout << "s4 shrink_to_fit done, length: " << s4.length() << "\n";
+
+    // 9. reverse UTF-8 string
+    String utf8Str(U"🌟🚀"); // emoji
+    std::cout << "utf8Str: " << utf8Str.toBasicString() << "\n";
+    utf8Str.reverse();
+    std::cout << "utf8Str reversed: " << utf8Str.toBasicString() << "\n";
+
+    // 10. STL
+
+    std::unordered_map<String, String> map = {
+        {String("我去"), String("123")}
+    };
+
+    std::cout << map[String("我去")];
+
+    return 0;
+}
+ 

xmake.lua

@@ -63,3 +63,11 @@ target("ir_test_main")
     add_files("src/IR/ir_test_main.cpp")
     
     set_warnings("all")
+
+target("StringTest")
+    set_kind("binary")
+    
+    add_files("src/Core/StringTest.cpp")
+
+    set_warnings("all")
+