How to restrict interface{} to a specific type
I am using go and have a factory function that returns different types of objects based on the requested identifier:
func newobject(id string) interface{} { switch id { case "truck": return truck{} case "car": return car{} .... } }
The following are the respective structure types:
type Truck struct { Foo string } type Car struct { Bar string }
As you can see, trucks and cars have nothing in common. The problem arises because I now have to deal with the overly broad type interface{}
when calling newobject(..)
. I know there are generics, but this requires keeping a list of all supported types in a type constraint, which complicates things in my code base.
Basically I'm looking for a way how to use inheritance here, which of course go doesn't support. What's the alternative?
Correct answer
newobject(..)
Function can be implemented with the support of generics. You don't need to keep a list of all supported types in a type constraint.
func NewObject[T any](id string) T { var vehicle any switch id { case "truck": vehicle = Truck{ Foo: "foo", } case "car": vehicle = Car{ Bar: "bar", } } if val, ok := vehicle.(T); ok { return val } var otherVehicle T fmt.Printf("Not implemented. Returning with default values for \"%v\"\n", id) return otherVehicle }
You can see the full example here.
The above is the detailed content of How to restrict interface{} to a specific type. For more information, please follow other related articles on the PHP Chinese website!

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics



OpenSSL, as an open source library widely used in secure communications, provides encryption algorithms, keys and certificate management functions. However, there are some known security vulnerabilities in its historical version, some of which are extremely harmful. This article will focus on common vulnerabilities and response measures for OpenSSL in Debian systems. DebianOpenSSL known vulnerabilities: OpenSSL has experienced several serious vulnerabilities, such as: Heart Bleeding Vulnerability (CVE-2014-0160): This vulnerability affects OpenSSL 1.0.1 to 1.0.1f and 1.0.2 to 1.0.2 beta versions. An attacker can use this vulnerability to unauthorized read sensitive information on the server, including encryption keys, etc.

The article explains how to use the pprof tool for analyzing Go performance, including enabling profiling, collecting data, and identifying common bottlenecks like CPU and memory issues.Character count: 159

The article discusses writing unit tests in Go, covering best practices, mocking techniques, and tools for efficient test management.

Queue threading problem in Go crawler Colly explores the problem of using the Colly crawler library in Go language, developers often encounter problems with threads and request queues. �...

The library used for floating-point number operation in Go language introduces how to ensure the accuracy is...

This article introduces a variety of methods and tools to monitor PostgreSQL databases under the Debian system, helping you to fully grasp database performance monitoring. 1. Use PostgreSQL to build-in monitoring view PostgreSQL itself provides multiple views for monitoring database activities: pg_stat_activity: displays database activities in real time, including connections, queries, transactions and other information. pg_stat_replication: Monitors replication status, especially suitable for stream replication clusters. pg_stat_database: Provides database statistics, such as database size, transaction commit/rollback times and other key indicators. 2. Use log analysis tool pgBadg

The article discusses the go fmt command in Go programming, which formats code to adhere to official style guidelines. It highlights the importance of go fmt for maintaining code consistency, readability, and reducing style debates. Best practices fo

Backend learning path: The exploration journey from front-end to back-end As a back-end beginner who transforms from front-end development, you already have the foundation of nodejs,...
