48 lines
1.1 KiB
Markdown
48 lines
1.1 KiB
Markdown
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# String::operator=
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```cpp
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String& operator=(const String& other);
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String& operator=(String&& other) noexcept;
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String& operator=(const char* str);
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```
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将新的值赋给 String 对象，替换原有的内容。
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**参数：**
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- `other` - 另一个 String 对象（拷贝赋值或移动赋值）
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- `str` - 以 null 结尾的 C 字符串
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**返回：** `*this`，支持链式调用
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**复杂度：**
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- 拷贝赋值：O(n)，n 为 other 的长度
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- 移动赋值：O(1)
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- 从 `const char*` 赋值：O(n)，n 为 str 的长度
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**示例：**
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```cpp
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#include "XCEngine/Containers/String.h"
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#include <iostream>
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int main() {
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XCEngine::Containers::String s1;
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XCEngine::Containers::String s2("hello");
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s1 = s2; // 拷贝赋值
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std::cout << s1.CStr() << std::endl; // 输出: hello
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s1 = "world"; // 从 const char* 赋值
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std::cout << s1.CStr() << std::endl; // 输出: world
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XCEngine::Containers::String s3("moved");
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s1 = std::move(s3); // 移动赋值
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std::cout << s1.CStr() << std::endl; // 输出: moved
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return 0;
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}
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```
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## 相关文档
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- [String 总览](string.md) - 返回类总览
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