vendor/github.com/zclconf/go-cty/cty/collection.go

   1 package cty
   2
   3 import (
   4         "errors"
   5 )
   6
   7 type collectionTypeImpl interface {
   8         ElementType() Type
   9 }
  10
  11 // IsCollectionType returns true if the given type supports the operations
  12 // that are defined for all collection types.
  13 func (t Type) IsCollectionType() bool {
  14         _, ok := t.typeImpl.(collectionTypeImpl)
  15         return ok
  16 }
  17
  18 // ElementType returns the element type of the receiver if it is a collection
  19 // type, or panics if it is not. Use IsCollectionType first to test whether
  20 // this method will succeed.
  21 func (t Type) ElementType() Type {
  22         if ct, ok := t.typeImpl.(collectionTypeImpl); ok {
  23                 return ct.ElementType()
  24         }
  25         panic(errors.New("not a collection type"))
  26 }
  27
  28 // ElementCallback is a callback type used for iterating over elements of
  29 // collections and attributes of objects.
  30 //
  31 // The types of key and value depend on what type is being iterated over.
  32 // Return true to stop iterating after the current element, or false to
  33 // continue iterating.
  34 type ElementCallback func(key Value, val Value) (stop bool)