The "generic function or template function" of the Go language

This is a created article in which the information may have evolved or changed.

First of all know that Golang is not a Java generic function or C + + template function of this syntax, today learned a very useful similar to the generic operation of the syntax, to share with you

The purpose of this is to implement a generic add function, as described in the Add function.

Three add functions are written first

Before unifying the three add functions, learn the use of a simple interface{}, noting that Int,int32,int64 is a different type in SetValue's generic judgments

I believe most of the students here understand that we are going through switch data:=input. (type) to implement the so-called generics, by first using the most general pseudo-code: ADD (A, b) {return a+b}
PS: Here B2 is actually a float64 type
You can also pass pointers
See if there is a problem here, if my Add function is pseudo-code: Add (a,b,c) {return a+b+c}, do I want a switch case nested 3 times? It's too hard to look at this code, so the custom data type can be judged, too.
By customizing Intstruct, float32struct, stringstruct This structure, the code looks much more comfortable.