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Source file src/go/types/objset.go

Documentation: go/types

  // 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
  }
  

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