std::exception
时间: 2023-10-19 17:08:37 浏览: 31
`std::exception` 是 C++ 标准库中的一个基类,用于表示异常情况。它是一个抽象类,不能直接实例化,只能通过派生出的子类来表示具体的异常情况。在 C++ 中,当程序发生异常时,通常会抛出一个对象作为异常,这个对象必须派生自 `std::exception` 或其子类,并实现 `what()` 方法,用于返回异常信息的字符数组。这样可以让程序员在捕获异常时得到有用的信息,便于调试和处理异常情况。
相关问题
terminating with uncaught exception of type std::exception: std::excepti
on: std::exception: std::exception is a base class for all standard exceptions in C++. It is typically used to catch any exception that is derived from it. When the program terminates with an uncaught exception of type std::exception, it means that an exception occurred during the execution of the program, but there was no catch block to handle it.
To resolve this issue, you can add a try-catch block around the code that potentially throws the exception. Here's an example:
```cpp
try {
// Code that may throw an exception
} catch (const std::exception& e) {
// Handle the exception
}
```
By catching the exception, you can handle it gracefully and prevent the program from terminating abruptly. Make sure to replace the comment with the actual code that may throw the exception.
If you provide more specific details about your code or the exception you are encountering, I might be able to provide more targeted assistance.
std::exception参数列表
在 C++ 中,std::exception 是一个标准库中的异常类,其定义如下:
```c++
class exception {
public:
exception() noexcept;
exception(const exception&) noexcept;
exception& operator=(const exception&) noexcept;
virtual ~exception();
virtual const char* what() const noexcept;
};
```
其中,std::exception() 是默认构造函数,std::exception(const exception&) 是拷贝构造函数,operator= 是赋值运算符,~exception() 是析构函数,what() 是一个虚函数,用于返回异常的描述信息。
如果您想要在创建 std::exception 对象时传入参数,您可以自定义一个继承 std::exception 的异常类,并重写其构造函数,例如:
```c++
class my_exception : public std::exception {
public:
my_exception(const char* msg) : m_msg(msg) {}
virtual const char* what() const noexcept override { return m_msg.c_str(); }
private:
std::string m_msg;
};
```
在上面的示例中,我们自定义了一个 my_exception 异常类,其构造函数接受一个 const char* 类型的参数,用于初始化异常的描述信息。在 what() 函数中,我们返回了 m_msg 成员变量的 c-string 类型。这样,当我们创建 my_exception 对象并抛出时,就可以在异常处理程序中获取到自定义的异常信息了。