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XCSDD/docs/api/containers/string/constructor.md
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String::String

String();
String(const char* str);
String(const char* str, SizeType len);
String(const String& other);
String(String&& other) noexcept;

构造 String 对象。提供多种构造方式以适应不同的使用场景。

参数:

  • str - 以 null 结尾的 C 字符串
  • len - 要复制的字符数量
  • other - 另一个 String 对象(用于拷贝构造或移动构造)

返回:

复杂度:

  • 默认构造O(1)
  • const char* 构造O(n),其中 n 为字符串长度
  • 拷贝构造O(n)
  • 移动构造O(1)

示例:

#include "XCEngine/Containers/String.h"
#include <iostream>

int main() {
    XCEngine::Containers::String s1;                          // 默认构造
    XCEngine::Containers::String s2("hello");                 // 从 C 字符串构造
    XCEngine::Containers::String s3("world", 3);             // 从 C 字符串前 n 个字符构造
    XCEngine::Containers::String s4(s2);                      // 拷贝构造
    XCEngine::Containers::String s5(std::move(s4));           // 移动构造

    std::cout << s2.CStr() << std::endl;  // 输出: hello
    std::cout << s3.CStr() << std::endl;  // 输出: wor
    std::cout << s4.CStr() << std::endl;  // 输出: hello
    std::cout << s5.CStr() << std::endl;  // 输出: hello
    return 0;
}

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