Why Does Visual Studio 2015 Require \'&\' to Create a Pointer to a Member Function?

Non-Standard Syntax in Visual Studio 2015: Using '&' for Pointer to Member

Problem

When trying to access a member function in C without using the function call syntax, Visual Studio 2015 encounters an error: "non-standard syntax; use '&' to create a pointer to member."

Explanation

In Visual Studio, non-member functions can be used in expressions without using the function call syntax. However, for member functions, this is not allowed. To obtain a pointer to a member function, it is necessary to use the '&' operator.

Resolution

The solution to the error is to prefix the problematic member function name with the '&' operator, creating a pointer to the member function. By doing this, the function can be used in expressions without the function call syntax.

Example

Consider the following class definition:

<code class="cpp">class TicTacToe {
public:
    void player1Move(string coordX);
};</code>

To access the player1Move member function without using the function call syntax, use the following pointer to member:

<code class="cpp">TicTacToe::&player1Move;</code>

This pointer to member can now be used in expressions without calling the function explicitly:

<code class="cpp">TicTacToe Board;
(Board.*player1Move)("some_coordinate");</code>

By using the '&' operator, Visual Studio can correctly interpret the intent and avoid the non-standard syntax error.

The above is the detailed content of Why Does Visual Studio 2015 Require \'&\' to Create a Pointer to a Member Function?. For more information, please follow other related articles on the PHP Chinese website!