Why Am I Getting the \"non-standard syntax; use \'&\' to create a pointer to member\" Error in Visual Studio 2015?

Resolving "non-standard syntax; use '&' to create a pointer to member" Error in Visual Studio 2015

Problem:

An error message is encountered during compilation in Visual Studio 2015, stating "non-standard syntax; use '&' to create a pointer to member." This error pertains to the attempt to call a member function without using the proper pointer syntax.

Cause:

In C , member functions are accessed using pointers to member functions rather than directly. When using member functions within non-member functions, it's essential to prepend the member function name with an '&' to indicate the pointer.

Solution:

To resolve this error, modify the code to use the proper pointer syntax when calling member functions. Here's how you can fix the issue in your "player1Move" member function:

<code class="cpp">void TicTacToe::player1Move(string coordX) // ERROR
{
  cout << "Enter X: " << endl;
  cin >> coordX;
  _coordX = coordX;
}</code>

The above code needs to be replaced with:

<code class="cpp">void TicTacToe::player1Move(string coordX)
{
  cout << "Enter X: " << endl;
  cin >> coordX;
  _coordX = coordX;
}</code>

By adding '&' before the "player1Move" function name, you create a pointer to the member function, allowing you to call it correctly.

Additional Explanation:

When a member function is not called explicitly on an object instance (as a method in object-oriented programming), it can be called using a pointer to a member function. The '&' operator in C is used to create a pointer to a member function. This syntax adheres to the C standard and allows for proper access to member functions from non-member contexts.

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