What is the application method of bind function in the standard library of Clipper 11?

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What is bind?

Bind as its name implies: bind

In popular terms, it can be understood in this way that it is a bit like a function pointer.

The data goes like this: think of the bind function as an adapter for a general-purpose function that accepts a callable object and generates a new callable object to "adapt" to the original object parameter list

It is generally called in the form:

/ / where newCallable is a callable object, and arg_list is a comma-separated list of parameters / / when we call newCallable,newCallable, we call callable and pass the parameter auto newCallable = bind (callable, arg_list) with arg_list.

Okay, the point is in arg_list, so how do we pass in parameters?

They are identified by the position of these parameters, such as _ n, n is shaping, _ 1 is the first parameter, _ 2 is the second parameter, and so on.

The name _ n is defined in the placeholders namespace, while the placeholders itself is defined in the std namespace, so it looks like:

Using std:: placeholders::_1

Next, let's give some examples.

Take a chestnut.

Bind is in the header file # include, which should be included first.

1. Bind ordinary function with no arguments # include # include / / contains this header file / / ordinary function void Fun () {std::cout