Binding Member Variables

Yes, std::bind can be used to bind member variables as well as member functions. When binding a member variable, you need to provide a pointer to the member variable using the & operator.

For example, consider a simple Player struct with a std::string Name member variable:

1#include <functional>
2#include <iostream>
3
4struct Player {
5  std::string Name{"Ariel"};  
6};
7
8int main() {
9  Player PlayerOne;
10
11  auto GetName{std::bind(
12    &Player::Name, &PlayerOne)};  
13
14  std::cout << GetName();
15}

1Ariel

In this example, we bind the Name member variable of PlayerOne using std::bind. The resulting GetName functor, when called, returns the value of PlayerOne.Name.

One thing to note is that when binding member variables, the functor returns a reference to the member variable. If you want to modify the member variable through the functor, you can do so directly:

1#include <functional>
2#include <iostream>
3
4struct Player {
5  std::string Name{"Ariel"};
6};
7
8int main() {
9  Player PlayerOne;
10
11  auto GetName{std::bind(
12    &Player::Name, &PlayerOne)};
13
14  GetName() = "Anna";
15
16  std::cout << PlayerOne.Name << '\n';
17}

1Anna

Binding member variables can be useful in scenarios where you want to provide access to specific member variables of an object without exposing the entire object.