qt override
时间: 2023-12-10 11:02:51 浏览: 23
In Qt, the `override` keyword is used to indicate that a virtual function overrides a base class virtual function. This helps to prevent mistakes in the implementation of virtual functions, and helps to ensure that the correct behavior is maintained when the function is called through a base class pointer or reference.
For example, suppose we have a base class `Base` with a virtual function `foo()`:
```cpp
class Base {
public:
virtual void foo();
};
```
And a derived class `Derived` that overrides `foo()`:
```cpp
class Derived : public Base {
public:
void foo() override;
};
```
By using the `override` keyword, we indicate to the compiler that `Derived::foo()` should override `Base::foo()`. If we accidentally misspell the function name or the function signature is incorrect, the compiler will generate an error indicating that `Derived::foo()` does not override anything. This helps to catch errors early in the development process, before they can cause problems at runtime.