Definition Of Implicitly-declared Error
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Definition Of Implicitly-declared Operator=
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Error Definition Of Implicitly-declared 'virtual
of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Can anyone help me understand this error? “definition of implicitly-declared ‘classA::classA()’” up vote 20 down vote
Definition Of Implicitly Declared Copy Assignment Operator
favorite 1 Heres the code: #include #include using namespace std; class classA { protected: void setX(int a); private: int p; }; classA:: classA() { //error here. p = 0; } void classA:: setX(int a) { p = a; } int main() { system("PAUSE"); return EXIT_SUCCESS; } c++ share|improve this question asked Apr 23 '11 at 17:34 darko 61662248 add a comment| 3 Answers 3 active oldest votes up vote which is of non-class type 41 down vote accepted You forgot to declare the constructor in the class definition. Declare it in public section of the class (if you want clients to create instance using it): class classA { public: classA(); // you forgot this! protected: void setX(int a); private: int p; }; Now you can write its definition outside the class which you've already done. share|improve this answer edited Apr 23 '11 at 17:41 answered Apr 23 '11 at 17:36 Nawaz 203k62447654 Actually, the thing which I know was that the default constructor is provided by the compiler by default. Here you have mentioned that definition of the constructor was missing. But, I was not knowing the 'WHY' we have to provide the default constructor when it is already being provided by the compiler. But, now, I knew that if we are defining the default constructor which is not in accordance with the one provided by the compiler, we will have to define it explicitly. I din't find the 'WHY'. :) –Chaitanya Mar 6 '13 at 9:43 @Chaitanya: The compiler does generate a default constructor for you IF you don't declare (and define) one yourself. In the question, the OP has attempted to define the default constructor outside the class, without decla
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 expected unqualified-id before Business Learn more about hiring developers or posting ads with us Stack Overflow Questions c++ destructor Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million c++ copy constructor programmers, just like you, helping each other. Join them; it only takes a minute: Sign up error: definition of implicitly declared copy constructor up vote 4 down vote favorite I'm having issues with a Qt C++ Project http://stackoverflow.com/questions/5765780/can-anyone-help-me-understand-this-error-definition-of-implicitly-declared-cl that I'm working on at the moment. It's a new section that I'm covering and I'm finding it a bit confusing. I have created some classes Asset which is inherited by Stock, Bond and Savings classes. All this was okay. I then created a class called AssetList which derived QList, this class is where I have found the problem. Here is the code I have so far. AssetList.h #ifndef ASSET_LIST_H #define ASSET_LIST_H #include "Asset.h" http://stackoverflow.com/questions/22760624/error-definition-of-implicitly-declared-copy-constructor #include class AssetList : public QList { public: AssetList(){} ~AssetList(); bool addAsset(Asset*); Asset* findAsset(QString); double totalValue(QString); }; #endif AssetList.cpp #include "AssetList.h" AssetList::AssetList(const AssetList&) : QList(){} AssetList::~AssetList() { qDeleteAll(*this); clear(); } bool AssetList::addAsset(Asset* a) { QString desc = a->getDescription(); Asset* duplicate = findAsset(desc); if(duplicate == 0) { append(a); return true; } else { delete duplicate; return false; } } Asset* AssetList::findAsset(QString desc) { for(int i = 0 ; i < size() ; i++) { if(at(i)->getDescription() == desc) { return at(i); } } return 0; } double AssetList::totalValue(QString type) { double sum = 0; for(int i = 0 ; i < size() ; i++) { if(at(i)->getType() == type) { sum += at(i)->value(); } } return sum; } The error I'm getting at the moment is a compilation error: error: definition of implicitly declared copy constructor I'm not quite sure what this means, I've been googling around and looking in the textbook and haven't found much. Can anyone help me or put me in the right direction of figuring this out? Thanks in advance! c++ qt copy-constructor share|improve this question asked Mar 31 '14 at 11:39 nickcorin 4361519 add a comment| 1 Answer 1 active oldest votes up vote 9 down vote accepted You define a copy constructor: AssetList::AssetList(const AssetList&) : QList(){} But you do not declare it in the AssetList
here for a quick overview of the site Help Center Detailed answers to any questions http://stackoverflow.com/questions/28206954/implicitly-declared-function-error-c 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 developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community definition of of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Implicitly declared function error C++ up vote -1 down vote favorite I'm having an issue compiling my C++ file. This is the error I get: Multiple markers at this line - Member declaration not definition of implicitly found - definition of implicitly-declared 'InsultGenerator::InsultGenerator(const InsultGenerator&)' I'm using MinGW as my compiler. Here is the C++ code: #include #include #include #include #include "Insultgenerator_0hl14.h" using namespace std; FileException::FileException(const string& m) : message(m){} string& FileException::what(){ return message;} NumInsultsOutOfBounds::NumInsultsOutOfBounds(const string& m) : message(m){} string& NumInsultsOutOfBounds::what(){ return message;} InsultGenerator::InsultGenerator(const InsultGenerator& ) {} void InsultGenerator::initialize() const{ int cols(0); string x; string filename("InsultsSource.txt"); ifstream file(filename.c_str()); if(file.fail()){ throw FileException("File not read."); } while(file >> x){ }} //vector InsultGenerator::talkToMe() const{ // };//end talkToMe // vector InsultGenerator::generate(const int n) const{ // };//end generate //int InsultGenerator::generateAndSave(const string filename, const int n) const{ //};//end generateAndSave Here is the header file: #ifndef INSULTGENERATOR_0HL14_H_ #define INSULTGENERATOR_0HL14_H_ #include #include using namespace std; class InsultGenerator{ public: InsultGenerator(vector); void initialize() const; string talkToMe() const; vector generate(const int) const; int generateAndSave (const string, const int) const; private: vector colA; vector colB; vector colC; }; class FileException{ public: FileException(const string&); string& what(); private: string message; }; class NumInsultsOutOfBounds{ public: