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// Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// This file implements objsets.
// An objset is similar to a Scope but objset elements
// are identified by their unique id, instead of their
// object name.
package types
// An objset is a set of objects identified by their unique id.
// The zero value for objset is a ready-to-use empty objset.
type objset map[string]Object // initialized lazily
// insert attempts to insert an object obj into objset s.
// If s already contains an alternative object alt with
// the same name, insert leaves s unchanged and returns alt.
// Otherwise it inserts obj and returns nil.
func (s *objset) insert(obj Object) Object {
id := obj.Id()
if alt := (*s)[id]; alt != nil {
return alt
if *s == nil {
*s = make(map[string]Object)
(*s)[id] = obj
return nil