[c++] [[deprecated]] attribute

To apply the [[deprecated]] attribute to a function in C++, you can do the following:

[[deprecated("Use better_alternative_function() instead")]]
void old_function() {
    // function implementation

In this example, the [[deprecated]] attribute is applied to the old_function() to indicate that it should no longer be used, and the message provides a suggestion for an alternative function to use.

When compiling code with the [[deprecated]] attribute, the compiler will generate a warning message to alert the developer about the usage of deprecated functions, classes, or variables.

It’s good practice to provide a clear message explaining why the item is deprecated and what alternative should be used instead.