/*============================================================================
  CMake - Cross Platform Makefile Generator
  Copyright 2000-2010 Kitware, Inc., Insight Software Consortium

  Distributed under the OSI-approved BSD License (the "License");
  see accompanying file Copyright.txt for details.

  This software is distributed WITHOUT ANY WARRANTY; without even the
  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  See the License for more information.
============================================================================*/
#ifndef cmTargetDepend_h
#define cmTargetDepend_h

#include "cmStandardIncludes.h"

class cmTarget;

/** One edge in the global target dependency graph.
    It may be marked as a 'link' or 'util' edge or both.  */
class cmTargetDepend
{
  cmTarget const* Target;

  // The set order depends only on the Target, so we use
  // mutable members to acheive a map with set syntax.
  mutable bool Link;
  mutable bool Util;
public:
  cmTargetDepend(cmTarget const* t): Target(t), Link(false), Util(false) {}
  operator cmTarget const*() const { return this->Target; }
  cmTarget const* operator->() const { return this->Target; }
  cmTarget const& operator*() const { return *this->Target; }
  friend bool operator < (cmTargetDepend const& l, cmTargetDepend const& r)
    { return l.Target < r.Target; }
  void SetType(bool strong) const
    {
    if(strong) { this->Util = true; }
    else { this->Link = true; }
    }
  bool IsLink() const { return this->Link; }
  bool IsUtil() const { return this->Util; }
};

/** Unordered set of (direct) dependencies of a target. */
class cmTargetDependSet: public std::set<cmTargetDepend> {};

#endif