40 lines
1.1 KiB
Markdown
40 lines
1.1 KiB
Markdown
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# String::StartsWith
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```cpp
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bool StartsWith(const String& prefix) const;
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bool StartsWith(const char* prefix) const;
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```
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检查字符串是否以指定的前缀开头。
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**参数：**
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- `prefix` - 要检查的前缀（String 或 const char*）
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**返回：** 如果字符串以指定前缀开头则返回 `true`，否则返回 `false`
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**复杂度：** O(n)，其中 n 为前缀长度
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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 s("Hello World");
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std::cout << std::boolalpha;
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std::cout << s.StartsWith("Hello") << std::endl; // 输出: true
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std::cout << s.StartsWith(XCEngine::Containers::String("Hello")) << std::endl; // 输出: true
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std::cout << s.StartsWith("World") << std::endl; // 输出: false
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std::cout << s.StartsWith("") << std::endl; // 输出: true
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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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- [EndsWith](ends-with.md) - 检查后缀
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- [Find](find.md) - 查找子串
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