The following column will introduce Go pointers to you in the golang tutorial column. I hope it will be helpful to friends in need!
Combined with this example to analyze
The result:
Combined with the basis of the previous C language, Draw a picture to explain why the above values appear. Let’s first check what these two operators are in Go.
①For all results with a
var a int = 1 defines a variable a with a value of 1, as shown in the following figure:
&a is the address that stores the value of a variable
*&a is a pointer to &a, *&a = a = 1
②All Result with b
var b *int = &a
Similar to C language int *b = &a Define a pointer b pointing to an integer variable, b points to the address of a
So:
b = &a = 0xc04203c1d0
&b = 0xc042058018 &b is the real address of the pointer variable b, which is the one after execution
*&b = *(&b) = b = &a = 0xc04203c1d0
*b = *&a = a = 1
③All results with c
As shown in the picture above:
var c **int = &b
actually defines a pointer variable pointing to an integer pointer
c = &b = 0xc042058018
*c = *&b = b = &a = 0xc04203c1d0
&c is the real address of this variable. What is shown here is the result of the operation 0xc042068020
* &c With experience, you can find that *& is eliminated directly = c = 0xc042058018
**c At first glance, you don’t know what it is. In fact, you can evaluate it through conversion
**c = **&b = *b = *&a = a = 1
***&*&*&*&*&c This can be eliminated first*& **c = 1
④About x
x = *b = *&a = a = 1
To summarize the above:
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