Golang released generic programming with a specific goal for developers to write a standard set of types to utilize as type parameters for functions and type structs. The syntax to write a generic function is like func F[T any] (p T){ … } that can be used to perform a common use case. Also, types can have type parameters list type O[T1, T2 any] struct.
Deep Dive into Go Generic Type Structures and Syntax
https://codingpirate.com/deep-dive-into-go-generic-type-structures-and-syntax-6f1a68e2c9c5
This repository will provide an example module written with the Go generic type structure. The following code snippet shows a middleware module to showcase the type parameter and function type arguments features in the Go generic design.
type LoginFn[P AuthParameter, R AuthClaimResponse] func(context.Context, P) (R, error)
type AuthParameter interface {
Employee | Admin | Customer
}
type AuthClaimResponse interface {
*GeneralClaimResponse | *AdminClaimResponse
}
func authMiddleware[P AuthParameter, R AuthClaimResponse](
ctx context.Context,
loginFn LoginFn[P, R], authReq P) (R, error) {
var retry = 5
return loginWithRetry(ctx, retry, loginFn, authReq)
}
func loginWithRetry[P AuthParameter, R AuthClaimResponse](
ctx context.Context,
retry int,
loginFn LoginFn[P, R], authReq P) (R, error) {
resp, err := loginFn(ctx, authReq)
if err != nil {
if retry--; retry >= 0 {
return loginWithRetry(ctx, retry, loginFn, authReq)
}
return nil, err
}
fmt.Println("login successful ")
return resp, nil
}go test -v -count=1 -race -cover --coverprofile=unit.out ./... && go tool cover -html=unit.out- https://go.googlesource.com/proposal/+/HEAD/design/43651-type-parameters.md
- https://go.dev/blog/type-inference
This project is licensed under the MIT License