CPP: how to use non-static function as callback ?
## Target
- 在类中如何使用回调函数？
- 如何在回调函数中绑定当前类？
- 如何对回调函数进行传参？
## code
```cpp
#include
#include
#include
using namespace std::placeholders;
class Test {
public:
Test(int v_t)
: v_(v_t)
{
auto callback_test = std::bind(&Test::callback_handler, this, _1);
callback_test(100);
}
~Test() {}
void SetValue(int i) { v_ = i; }
void callback_handler(int p_t)
{
std::cout << "callback in class: " << p_t << std::endl;
}
int v_;
};
int main()
{
Test a{ 123 };
std::cout << "test callback in main" << std::endl;
std::cout << a.v_ << std::endl; // print 123
auto _callback = std::bind(&Test::SetValue, &a, _1); // create the callback
_callback(55); // call the callback
std::cout << a.v_ << std::endl; // print 55
return 0;
}
```
## Result
```cpp
✗ ./callback_in_class
callback in class: 100
test callback in main
123
55
```
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