diff options
Diffstat (limited to 'src/context/context.go')
| -rw-r--r-- | src/context/context.go | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/src/context/context.go b/src/context/context.go index 21dc8676bf..da294b1292 100644 --- a/src/context/context.go +++ b/src/context/context.go @@ -39,6 +39,7 @@ package context import ( "errors" "fmt" + "reflect" "sync" "time" ) @@ -66,7 +67,7 @@ type Context interface { // // // Stream generates values with DoSomething and sends them to out // // until DoSomething returns an error or ctx.Done is closed. - // func Stream(ctx context.Context, out <-chan Value) error { + // func Stream(ctx context.Context, out chan<- Value) error { // for { // v, err := DoSomething(ctx) // if err != nil { @@ -424,7 +425,12 @@ func WithTimeout(parent Context, timeout time.Duration) (Context, CancelFunc) { // // Use context Values only for request-scoped data that transits processes and // APIs, not for passing optional parameters to functions. -func WithValue(parent Context, key interface{}, val interface{}) Context { +// +// The provided key must be comparable. +func WithValue(parent Context, key, val interface{}) Context { + if !reflect.TypeOf(key).Comparable() { + panic("key is not comparable") + } return &valueCtx{parent, key, val} } |