Error C2662

resources Windows Server 2012 resources Programs MSDN subscriptions Overview Benefits Administrators Students Microsoft Imagine Microsoft Student Partners ISV Startups TechRewards Events Community Magazine Forums Blogs Channel 9 Documentation error c2662 conversion loses qualifiers APIs and reference Dev centers Retired content Samples We’re sorry. The error c2662 cannot convert 'this' pointer from content you requested has been removed. You’ll be auto redirected in 1 second. C/C++ Building Reference C/C++ Build

Error C2166

Errors Compiler Errors C2600 Through C2699 Compiler Errors C2600 Through C2699 Compiler Error C2662 Compiler Error C2662 Compiler Error C2662 Compiler Error C2600 Compiler Error C2601 Compiler Error C2602

Error C2664

Compiler Error C2603 Compiler Error C2605 Compiler Error C2611 Compiler Error C2612 Compiler Error C2613 Compiler Error C2614 Compiler Error C2616 Compiler Error C2617 Compiler Error C2619 Compiler Error C2624 Compiler Error C2626 Compiler Error C2627 Compiler Error C2628 Compiler Error C2630 Compiler Error C2632 Compiler Error C2633 Compiler Error C2634 Compiler Error C2635 Compiler Error C2636 Compiler Error error c2440 C2637 Compiler Error C2638 Compiler Error C2640 Compiler Error C2645 Compiler Error C2646 Compiler Error C2647 Compiler Error C2648 Compiler Error C2649 Compiler Error C2650 Compiler Error C2651 Compiler Error C2652 Compiler Error C2653 Compiler Error C2654 Compiler Error C2655 Compiler Error C2656 Compiler Error C2657 Compiler Error C2658 Compiler Error C2659 Compiler Error C2660 Compiler Error C2661 Compiler Error C2662 Compiler Error C2663 Compiler Error C2664 Compiler Error C2665 Compiler Error C2666 Compiler Error C2667 Compiler Error C2668 Compiler Error C2669 Compiler Error C2670 Compiler Error C2671 Compiler Error C2673 Compiler Error C2674 Compiler Error C2675 Compiler Error C2676 Compiler Error C2677 Compiler Error C2678 Compiler Error C2679 Compiler Error C2680 Compiler Error C2681 Compiler Error C2682 Compiler Error C2683 Compiler Error C2687 Compiler Error C2688 Compiler Error C2689 Compiler Error C2690 Compiler Error C2691 Compiler Error C2692 Compiler Error C2693 Compiler Error C2694 Compiler Error C2695 Compiler Error C2696 Compiler Error C2698 TOC Collapse the table of content Expand the table of content This documentation is archived and is not being m

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Error C2679

more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags error c2511 Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, cannot convert this pointer from const to & helping each other. Join them; it only takes a minute: Sign up Compile Error C2662 [duplicate] up vote 1 down vote favorite This question already has an answer here: c++ error C2662 cannot convert 'this' pointer from 'const https://msdn.microsoft.com/en-us/library/2s2d2tez.aspx Type' to 'Type &' 3 answers I'm trying to pass an object as a reference to a function that accepts the object as a const however the compiler is throwing: error C2662: 'const int DataPacket::GetData(void)': cannot convert 'this' pointer from 'const DataPacket' to 'DataPacket &' IntelliSense says: the object has type qualifiers that are not compatible with the member function object type is: const DataPacket I made a test-cast of the code to demonstrate the issue: http://stackoverflow.com/questions/24815858/compile-error-c2662 #include #include class DataPacket { int SomeVar; public: DataPacket(int InitialData) { SomeVar = InitialData; } const int GetData() { return SomeVar; } }; void ProcessPacket(const DataPacket& Packet) { std::cout << Packet.GetData() << std::endl; } int main() { std::function f_Callback; f_Callback = ProcessPacket; while (true) { f_Callback(DataPacket(10)); } } Basically I have a STD function which the user can set to use their own callback function. A lower level class creates objects of type DataPacket when new packets arrive. I then want to pass the object into the callback function as a constant reference so not to copy the entire object and restrict the user from changing the original object. What's going on here? How can I pass DataPacket into f_Callback as a const reference? c++ c++11 const pass-by-reference share|improve this question edited Jul 28 '14 at 4:11 user2864740 35.2k43779 asked Jul 18 '14 at 1:03 KKlouzal 13112 marked as duplicate by Praetorianc++ Users with the c++ badge can single-handedly close c++ questions as duplicates and reopen them as needed. Jul 18 '14 at 1:49 This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question. add a comment| 1 Answer 1 active oldest votes up vote 5 down vote accepted The problem is that in the callback, the DataPacket

download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript). Home Qt Development General and Desktop C2662: https://forum.qt.io/topic/7774/solved-c2662-function-cannot-convert-this-pointer-from-type1-to-type2 'function' : cannot convert 'this' pointer from 'type1' to 'type2' C2662: 'function' : cannot convert 'this' pointer from 'type1' to 'type2' This topic has been deleted. Only users with http://www.qtcentre.org/threads/3213-cannot-convert-this-pointer-from-const-Square-to-Square-amp topic management privileges can see it. huckfinn last edited by Hello people, I have a QHash dynamicData which is not const! @ #pragma once #include #include error c2662 #include #include "DataItem.h" class DataController { public: DataController(void); ~DataController(void); int removeDataItem(qint32 key) const; protected: QHash dynamicData; }; @ And my source @ #include #include "DataController.h" DataController::DataController(void) { // } int DataController::removeDataItem(qint32 key) const { return this->dynamicData.remove( key ) ; } @ I get error C2662: 'QHash::remove' : cannot convert 'this' pointer from 'const QHash' to 'QHash error c2662 conversion &' My dynamicData is not constant, so remove should be callable. Whats the matter? I dont see the error.. Cheers Huck Reply Quote 0 thisisbhaskar last edited by Your removeDataItem() is const function, and its trying to remove/modify your class member variable. That may be the problem?? Reply Quote 0 JohanSolo last edited by [quote author="Vijay Bhaska Reddy" date="1311172988"]Your removeDataItem() is const function, and its trying to remove/modify your class member variable. That may be the problem??[/quote] It definitely is! A const method cannot modify the current instance (pointed by "this"). You have a conception problem in here : how could a method that removes an item from a container not modify the instance which "owns" the container... Of course there are workaround if you REALLY want the method to be const. You can either declare your QHash mutable or use const_cast to remove the "const" in front of the ‘const QHash’. I would'nt recommend this though. `They did not know it was impossible, so they did it.' -- Mark Twain Reply Quote 0 h

from 'const Square' to 'Square &' If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. Welcome to Qt Centre. Qt Centre is a community site devoted to programming in C++ using the Qt framework. Over 90 percent of questions asked here gets answered. If you are looking for information about Qt related issue — register and post your question. You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today! If you have any problems with the registration process or your account login, please contact us. + Reply to Thread Results 1 to 9 of 9 Thread: cannot convert 'this' pointer from 'const Square' to 'Square &' Thread Tools Show Printable Version Subscribe to this Thread… Search Thread Advanced Search Display Linear Mode Switch to Hybrid Mode Switch to Threaded Mode 2nd August 2006,09:53 #1 xgoan View Profile View Forum Posts View Blog Entries View Articles Intermediate user Join Date Jul 2006 Posts 126 Thanks 17 Thanked 4 Times in 3 Posts Qt products Platforms cannot convert 'this' pointer from 'const Square' to 'Square &' Hi, I'm trying to get up a class for a Qt program, but it gives me this errors: Error 1 error C2662: 'Square::left' : cannot convert 'this' pointer from 'const Square' to 'Square &' c:\Chus\konstructor\src\Square.cpp 6 Error 2 error C2662: 'Square::up' : cannot convert 'this' pointer from 'const Square' to 'Square &' c:\Chus\konstructor\src\Square.cpp 6 Error 3 error C2662: 'Square::right' : cannot convert 'this' pointer from 'const Square' to 'Square &' c:\Chus\konstructor\src\Square.cpp 6 Error 4 error C2662: 'Square::down' : cannot convert 'this' pointer from 'const Square' to 'Square &' c:\Chus\konstruct