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Golang is a language that supports object-oriented programming, and pointers and methods are often used in actual development. A pointer is a variable that stores the memory address of a variable. A method is a function that specifies a type. There is a difference between pointer methods and non-pointer methods in Golang. This article will explore the differences and uses of these two methods.
1. Pointer method
The pointer method is a method bound to a structure pointer. Pointer methods have the following characteristics:
For example, we define a structure type:
type Rectangle struct { width float64 height float64 }
We can use pointer methods to modify instances of this structure:
func (r *Rectangle) SetProperty(width, height float64) { r.width = width r.height = height }
In the above method, Receiver (r *Rectangle)
is a pointer to a Rectangle structure. This method is used to set the properties of Rectangle.
2. Non-pointer method
The non-pointer method is a method bound to a structure. It accepts a copy of the structure as the receiver parameter. The non-pointer method has the following characteristics :
For example, we define a structure type:
type Rectangle struct { width float64 height float64 }
We can use non-pointer methods to calculate the area of the structure:
func (r Rectangle) GetArea() float64 { return r.width * r.height }
In the above method , the receiver r Rectangle
is a copy of the value of the Rectangle structure. This method returns the area of the rectangle.
3. The difference between pointer methods and non-pointer methods
For example, we can use pointer methods to modify the structure:
func main() { rect := Rectangle{width: 10, height: 5} fmt.Println("Width:", rect.width, "Height:", rect.height) rect.SetProperty(20, 10) fmt.Println("Width:", rect.width, "Height:", rect.height) }
Output result:
Width: 10 Height: 5 Width: 20 Height: 10
4. Summary
In Golang Among them, pointer methods and non-pointer methods have their own advantages, disadvantages and usage scenarios. When defining methods, you need to consider the usage of the object and business needs, and choose an appropriate method to write code. Proper use of both methods can improve code readability and performance.
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