gcc/libstdc++-v3/testsuite/util/testsuite_rvalref.h

// -*- C++ -*-
// Testing utilities for the rvalue reference.
//
// Copyright (C) 2005, 2007, 2009 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3.  If not see
// <http://www.gnu.org/licenses/>.
//

#ifndef _GLIBCXX_TESTSUITE_RVALREF_H
#define _GLIBCXX_TESTSUITE_RVALREF_H 1

#include <testsuite_hooks.h>

namespace __gnu_test
{

  //  This class is designed to test libstdc++'s template-based rvalue
  //  reference support. It should fail at compile-time if there is an attempt
  //  to copy it (although see note just below).
  class rvalstruct
  {
    bool
    operator=(const rvalstruct&);

// Normally we don't define a copy constructor, as any use of it would
// show an inefficency. In some cases we know it will be aliased away
// by the compiler, but it still insists it is defined, so we provide
// a way of making it public but not giving a body, so any usage would
// instead fail at link-time.
#ifdef _GLIBCXX_TESTSUITE_ALLOW_RVALREF_ALIASING
  public:
    rvalstruct(const rvalstruct&);
#else
    rvalstruct(const rvalstruct&);

  public:
#endif
    int val;
    bool valid;

    rvalstruct() : valid(false)
    { }

    rvalstruct(int inval) : val(inval), valid(true)
    { }
    
    rvalstruct&
    operator=(int newval)
    { 
      VERIFY(valid == false);
      val = newval; 
      valid = true;
      return *this;
    }

    rvalstruct(rvalstruct&& in)
    { 
      VERIFY(in.valid == true);
      val = in.val;
      in.valid = false;
      valid = true;
    }

    rvalstruct&
    operator=(rvalstruct&& in)
    { 
      VERIFY(in.valid == true);
      val = in.val;
      in.valid = false;
      valid = true;
      return *this;
    }
  };

  bool 
  operator==(const rvalstruct& lhs, const rvalstruct& rhs)
  { return lhs.val == rhs.val; }

  bool
  operator<(const rvalstruct& lhs, const rvalstruct& rhs)
  { return lhs.val < rhs.val; }

  void
  swap(rvalstruct& lhs, rvalstruct& rhs)
  {  
    VERIFY(lhs.valid && rhs.valid);
    int temp = lhs.val;
    lhs.val = rhs.val;
    rhs.val = temp;
  }

  // This is a moveable class which copies how many times it is copied.
  // This is mainly of use in the containers, where the an element inserted
  // into a container has to be copied once to get there, but we want to check
  // nothing else is copied.
  struct copycounter
  {
    static int copycount;
    int val;
    bool valid;
    
    copycounter() : val(0), valid(true)
    { }

    copycounter(int inval) : val(inval), valid(true)
    { }

    copycounter(const copycounter& in) : val(in.val), valid(true)
    { 
      VERIFY(in.valid == true);
      ++copycount;
    }

    copycounter(copycounter&& in)
    { 
      VERIFY(in.valid == true);
      val = in.val;
      in.valid = false;
      valid = true;
    }
    
    copycounter&
    operator=(int newval)
    { 
      val = newval;
      valid = true;
      return *this;
    }

    bool
    operator=(const copycounter& in) 
    { 
      VERIFY(in.valid == true);
      ++copycount;
      val = in.val;
      valid = true;
      return true;
    }

    copycounter&
    operator=(copycounter&& in)
    { 
      VERIFY(in.valid == true);
      val = in.val;
      in.valid = false;
      valid = true;
      return *this;
    }
    
    ~copycounter()
    { valid = false; }
  };

  int copycounter::copycount = 0;
  
  bool 
  operator==(const copycounter& lhs, const copycounter& rhs)
  { return lhs.val == rhs.val; }

  bool
  operator<(const copycounter& lhs, const copycounter& rhs)
  { return lhs.val < rhs.val; }

  void
  swap(copycounter& lhs, copycounter& rhs)
  {  
    VERIFY(lhs.valid && rhs.valid);
    int temp = lhs.val;
    lhs.val = rhs.val;
    rhs.val = temp;
  }
  
} // namespace __gnu_test

#endif // _GLIBCXX_TESTSUITE_TR1_H