How to compare two function types in Golang?

Function type comparison In the Go language, function types can be compared based on their parameter and return value types. Two function types are equal if their signatures are the same; otherwise, they are not equal.

Function type comparison in Go

In Go, a function type is a special type that represents a function signature. It consists of the input parameter type and the output parameter type of the function. Function types can be compared like other types.

Syntax

func(x int) int
func(x string) string

These two function types have different input parameter types, so they are different types.

Practical Case

Let us consider the following two functions:

func Add(x, y int) int {
  return x + y
}

func Subtract(x, y int) int {
  return x - y
}

The signatures of these two functions are the same, so they are of the same type.

Comparing function types

To compare two function types, you can use the == and != operators. Function types are equal if their signatures are the same. Otherwise, they are not equal.

The following code compares two function types for equality:

func main() {
  addType := func(x, y int) int { return x + y }
  subType := func(x, y int) int { return x - y }

  if addType == subType {
    fmt.Println("函数类型相等")
  } else {
    fmt.Println("函数类型不相等")
  }
}

This code will print the following output:

函数类型不相等

Conclusion

Function types in Go can be compared like other types. Function types can be compared for equality using the == and != operators.

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