```
package gctx
import (
"context"
"fmt"
"reflect"
)
type body[T any] struct {
Value T
}
type typeKey[T any] struct {
}
func Put[T any](ctx context.Context, value T) context.Context {
key := typeKey[body[T]]{}
return context.WithValue(ctx, key, body[T]{Value: value})
}
func Get[T any](ctx context.Context) (T, error) {
key := typeKey[body[T]]{}
value, ok := ctx.Value(key).(body[T])
if !ok {
var zero T
return zero, errors.New("not found")
}
return value.Value, nil
}
``` |
|
