Error C2662 Volatile

Contents Error C2662 Cannot Convert 'this' Pointer From C++ Error C2662 C2662 Cannot Convert This Pointer From Const

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Error C2662 Cannot Convert 'this' Pointer From

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C++ Error C2662

4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Defining volatile class object up vote 5 down vote favorite Can the volatile be used for class objects?

C2662 Cannot Convert This Pointer From Const

Like: volatile Myclass className; The problem is that it doesn't compile, everywhere when some method is invoked, the error says: error C2662: 'function' : cannot convert 'this' pointer from 'volatile MyClass' to 'MyCLass &' What is the problem here and how to solve it? EDIT: class Queue { private: struct Data *data; int amount; int size; public: Queue (); ~Queue (); bool volatile push(struct Data element); bool volatile pop(struct Data *element); void volatile cannot convert this pointer from const to & cleanUp(); }; ..... volatile Queue dataIn; ..... EnterCriticalSection(&CriticalSection); dataIn.push(element); LeaveCriticalSection(&CriticalSection); c++ volatile share|improve this question edited Jun 20 '10 at 5:19 asked Jun 20 '10 at 4:38 maximus 1,41753574 Note that in C++, volatile does not guarantee thread-safety. That's different from, for example, .NET, where it does. –sbi Jun 20 '10 at 7:49 add a comment| 4 Answers 4 active oldest votes up vote 9 down vote accepted Yes, you can, but then you can only call member functions that are declared volatile (just like the const keyword). For example: struct foo { void a() volatile; void b(); }; volatile foo f; f.a(); // ok f.b(); // not ok Edit based on your code: bool volatile push(struct Data element); declares a non-volatile member function that returns a bool volatile (= volatile bool). You want bool push(struct Data element) volatile; share|improve this answer edited Jun 20 '10 at 5:29 answered Jun 20 '10 at 4:40 Jesse Beder 18.3k1372117 1 What about constructors and destructors and variables(properties) declared in class? –maximus Jun 20 '10 at 4:44 I did as you said, but anyway the same error messages.. –maximus Jun 20 '10 at 4:49 1 @maximus, constructors and destructors can't be overloaded with volatile (or const), and member variables inherit these prop

here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring c++ const method developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask c++ const function Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join const_cast them; it only takes a minute: Sign up Problems with STL as a static volatile member up vote 0 down vote favorite I'm trying to compile something like this: #include class thread { public: static volatile std::list http://stackoverflow.com/questions/3078237/defining-volatile-class-object threadList; //This is also protected by a mutex }; volatile std::list thread::threadList; void main() { thread A; thread::threadList.push_back(&A); thread::threadList.remove(&A); } I get these errors when trying to compile: test.cpp(14): error C2663: 'std::list::push_back' : 2 overloads have no legal conversion for 'this' pointer with [ _Ty=thread * ] test.cpp(15): error C2662: 'std::list::remove' : cannot convert 'this' pointer from 'volatile std::list' to 'std::list &' with [ _Ty=thread * ] Conversion loses qualifiers What am I doing wrong? EDIT: fixed some http://stackoverflow.com/questions/4812256/problems-with-stl-as-a-static-volatile-member formatting errors with < and > EDIT2: threadList is protected by a mutex, I just didn't put it here for simplicity c++ share|improve this question edited Jan 27 '11 at 3:30 asked Jan 27 '11 at 2:51 Mark 848925 1 Why are you using volatile? –Sam Miller Jan 27 '11 at 3:08 I'm betting he wants a list of all c++0x or boost thread s he has and he wants the container holding them to be synchronized –KitsuneYMG Jan 27 '11 at 3:12 add a comment| 4 Answers 4 active oldest votes up vote 4 down vote accepted Remove volatile and remove the problem. So for the real answer, it might help if you explain why you need to volatile, and what it is intended to mean here. It won't make the whole list be treated as volatile. See also previous answer share|improve this answer answered Jan 27 '11 at 3:06 Keith 5,922821 I'm using volatile because the list will be used by multiple threads. Also this code is simplified; my actual code has the list protected by a mutex. Now that I think about it, would volatile even make a difference in that case? –Mark Jan 27 '11 at 3:12 1 @Mark: No. If you have a lock around it, volatile is not needed for simple access protection. –JaredC Jan 27 '11 at 3:21 1 @Mark- Vo

����ѥ���������ͥ���ǡ�NRVO�Ȥ�����Ŭ���򤷤Ƥ���뤳�Ȥ�����ޤ������κ�Ŭ����ܤ��Ƥ����ȼ��Τ褦�ʥ����ɤˤ����ơ� #include class Hoge { public: Hoge() : val_(0) { std::cout << "���󥹥ȥ饯��" << std::endl; } Hoge(const Hoge &rhs) : val_(rhs.val_) { std::cout << "���ԡ����󥹥ȥ饯��" << std::endl; } http://d.hatena.ne.jp/nagoya313/20100509/1273371889 ~Hoge() { std::cout << "�ǥ��ȥ饯��" << std::endl; } void setVal(int val) { val_ = val; } int val() const { return http://kechengpuzi.com/q/s3078237/a/1 val_; } private: int val_; }; Hoge createHoge() { Hoge hoge; hoge.setVal(256); return hoge; } int main() { Hoge hoge(createHoge()); error c2662 std::cout << "val = " << hoge.val() << std::endl; return 0; } ���ϡ� ���󥹥ȥ饯�� val = 256 �ǥ��ȥ饯�� �Ȥʤäơ����ԡ����󥹥ȥ饯���θƤӽФ����ä���Ƥ��ޤ��ޤ������ʤϤ��κ�Ŭ���Ϥ��줷�����Ȥ�¿���ΤǤ��������ˤϥ��ԡ����󥹥ȥ饯��������ȸƤ�Ǥۤ������⤢��Ǥ��礦�� �����ǻפ��Ф����Τ�volatile�����Ҥ�¸�ߤǤ��������Ĥ��ѿ����դ���ȡ���Ŭ�����޻ߤ��Ƥ���ޤ���������createHoge�ؿ���main�ؿ���򼡤Τ褦�˽������Ƥߤ�ȡ� Hoge createHoge() { Hoge hoge; hoge.setVal(256); return hoge; } int main() { volatile Hoge hoge(createHoge()); std::cout << "val = " c2662 cannot convert << hoge.val() << std::endl; return 0; } ���顼�� error C2662: 'Hoge::setVal' : 'volatile Hoge' ���� 'Hoge &' �� 'this' �ݥ��󥿡����Ѵ��Ǥ��ޤ����Ѵ��ǽ����Ҥ������ޤ��� error C2558: class 'Hoge' : ���ԡ� ���󥹥ȥ饯���������ѤǤ��ʤ�����'explicit' �Ȥ����������Ƥ��ޤ��� 'Hoge::val' : 'volatile Hoge' ���� 'const Hoge &' �� 'this' �ݥ��󥿡����Ѵ��Ǥ��ޤ����Ѵ��ǽ����Ҥ������ޤ��� �Ȥ�����ĤΥ��顼���ФƤ��ޤ����פ�����ѿ���volatile�������Ƥ�Τˡ�volatile����ʤ����дؿ��Ȥ�volatile����ʤ����Ȥ�Ȥ륳�ԡ����󥹥ȥ饯�����ƤФ줿����ܤ���櫓�Ǥ��������ǡ�Hoge���饹�����򼡤Τ褦�˽������ޤ��� class Hoge { public: Hoge() : val_(0) { std::cout << "���󥹥ȥ饯��" << std::endl; } Hoge(const volatile Hoge &rhs) : val_(rhs.val_) { std::cout << "��Ŭ���˻ߥ��ԡ����󥹥ȥ饯��" << std::endl; } ~Hoge() { std::cout << "�ǥ��ȥ饯��" << std::endl; } Hoge &operator =(const Hoge &rhs) { val_ = rhs.val_; std::cout << "���ԡ�" << std::endl; } void setVal(int val) volatile { val_ = val; } int val() const volatile { return val_; } private: int val_; }; �ޤ���setVal�᥽�åɤ�volatile���дؿ��ˤ��ơ����ԡ����󥹥ȥ饯���ˡ�const volatile���Ȥ�������Τ��ɲä��ޤ������Ȥ��������ν����������� error C2558: class 'Hoge' : ���ԡ� ����

used for class objects? Like: volatile Myclass className; The problem is that it doesn't compile, everywhere when some method is invoked, the error says: error C2662: 'function' : cannot convert 'this' pointer from 'volatile MyClass' to 'MyCLass &' What is the problem here and how to solve it? EDIT: class Queue { private: struct Data *data; int amount; int size; public: Queue (); ~Queue (); bool volatile push(struct Data element); bool volatile pop(struct Data *element); void volatile cleanUp(); }; ..... volatile Queue dataIn; ..... EnterCriticalSection(&CriticalSection); dataIn.push(element); LeaveCriticalSection(&CriticalSection);

Game | 2010-06-20 I think he meant to say bool push(struct Data element) volatile; instead of bool volatile push(struct Data element); Also have a look here http://www.devx.com/tips/Tip/13671 SUPPORT US 扫一扫关注微信公众号 课程铺子, 可能是个更懂你的课程搜索引擎。 © 2016 课程铺子 kechengpuzi@gmail.com 课程铺子上线283天 课程铺子，每天陪你进步一点 冀ICP备16011938号-2