contextimpl

README

justforfunc 10: Implemeting the Context Package

Let's implement the context package, with exactly the same API as the one in the standard library, in under 40 minutes.

References:

• justforfunc #10: the context package video
• understanding nil: video and slides
• some context on context video and slides

JustForFunc #10: Implementing the Context Package

Documentation

Index

• Variables
• func WithCancel(parent Context) (Context, CancelFunc)
• func WithDeadline(parent Context, deadline time.Time) (Context, CancelFunc)
• func WithTimeout(parent Context, timeout time.Duration) (Context, CancelFunc)
• type CancelFunc
• type Context
  • func Background() Context
  • func TODO() Context
  • func WithValue(parent Context, key, value interface{}) Context

Variables

var Canceled = errors.New("context canceled")

var DeadlineExceeded = deadlineExceededErr{}

Functions

func WithCancel

func WithCancel(parent Context) (Context, CancelFunc)

func WithDeadline

func WithDeadline(parent Context, deadline time.Time) (Context, CancelFunc)

func WithTimeout

func WithTimeout(parent Context, timeout time.Duration) (Context, CancelFunc)

Types

type CancelFunc

type CancelFunc func()

type Context

type Context interface {
	Deadline() (deadline time.Time, ok bool)
	Done() <-chan struct{}
	Err() error
	Value(key interface{}) interface{}
}

func Background

func Background() Context

func TODO

func TODO() Context

func WithValue

func WithValue(parent Context, key, value interface{}) Context