const QString &name跟const QString name有什么不同
时间: 2024-05-24 10:14:54 浏览: 11
`const QString` is a type in the Qt framework's C++ API. It denotes a constant string object, which means that the string cannot be modified once it has been initialized. This is achieved by making the string data read-only. It is often used in situations where you want to ensure that a string value does not change during execution, such as in function parameters or class member variables. The `QString` class is used for handling Unicode strings in Qt, and provides a wide range of methods for manipulating and comparing strings.
相关问题
const QString &name
`const QString` 是一个不可修改的 QString 对象,即其值在创建后不能被修改。这通常用于在函数参数中传递字符串,以确保该字符串不会被修改。例如:
```cpp
void myFunction(const QString& str)
{
// 这里不能修改 str 的值
}
```
char*转为const QString &name
可以使用QString的构造函数将char*转换为QString,然后再将QString转换为const QString &。示例代码如下:
```cpp
char* name = "John";
const QString &nameStr = QString(name);
```
这里将char*类型的name转换为QString类型的nameStr,并且使用了const引用来避免不必要的拷贝。
相关推荐
![pdf](https://img-home.csdnimg.cn/images/20210720083512.png)
![pdf](https://img-home.csdnimg.cn/images/20210720083512.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)