Error while compilation in the args of the function

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Hi,
I have given only some part of the code related to my problem. I have problem while compliation. I have the problem in the constructor of the class RMstore. i Get the following compilation error

rmremote_server.cpp: In function `int main()':
rmremote_server.cpp:196: error: no matching function for call to `RMStore::RMStore(std::string)'
rmremote_server.cpp:17: note: candidates are: RMStore::RMStore(const RMStore&)
rmremote_server.cpp:26: note: RMStore::RMStore(std::string&)

C++ Syntax (Toggle Plain Text)
 
class RMStore
{
	string command;
	string result;
	string error;
 
	bool status;
 
	public:
 
	RMStore(string comm = "");
	inline string getCommand();
	inline string getResult();
	bool executeCommand();
};
 
RMStore::RMStore(string comm):command(comm)
{
	result = "";
	error = "";
}
 
 
string RMServer::getData()
{
	return data;
}
 
 
int main()
{
	string command;
	command = "ls -l /usr/local/dataware | grep ^l";
 
 
	RMServer *server = new RMServer();
 
	if(server->openConn() > 0)
	{
		while(server->acceptConn() > 0)
		{
			if(server->recvData() > 0)
			{
				RMStore *R = new RMStore(server->getData());
				//RMStore *R = new RMStore(command);
				R->executeCommand();
				server->sendData(R->getResult());
				//server->sendData(command);
				delete R;
			}
		}
	}
 
}
class RMStore
{
	string command;
	string result;
	string error;
	
	bool status;

	public:

	RMStore(string comm = "");
	inline string getCommand();
	inline string getResult();
	bool executeCommand();
};

RMStore::RMStore(string comm):command(comm)
{
	result = "";
	error = "";
}


string RMServer::getData()
{
	return data;
}


int main()
{
	string command;
	command = "ls -l /usr/local/dataware | grep ^l";


	RMServer *server = new RMServer();

	if(server->openConn() > 0)
	{
		while(server->acceptConn() > 0)
		{
			if(server->recvData() > 0)
			{
				RMStore *R = new RMStore(server->getData());
				//RMStore *R = new RMStore(command);
				R->executeCommand();
				server->sendData(R->getResult());
				//server->sendData(command);
				delete R;
			}
		}
	}

}

I was under the impression that, even tough we pass a string, the called function will take it in a ref and the compiler will not complain.

also if i use RMStore *R = new RMStore(command); instead of RMStore *R = new RMStore(server->getData()); i donn get any errors.

am i missing something here? please help?

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sweeya

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since Nov 2008

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Dec 19th, 2008

Re: Error while compilation in the args of the function

Visual C++ 9.0 compiler resolves this situation. Obvious workaround with your compiler: define explicitly default RMStore constructor (an all others):

c++ Syntax (Toggle Plain Text)
class RMStore {
public: // Place public part at the beginning
    RMStore():status(false){}
    // You forgot initialize status member
    explicit RMStore(const char* pcmd):
        command(p?p:""),status(false)
    {}
    explicit RMStore(const std::string& cmd):
        command(cmd),status(false)
    {}
    const std::string& getCommand() const {
         return command;
    }
...
private:
    std::string command;
    std::string result;
    // No need to initialize empty string members
    // explicitly: string default constructors do it.
...
};
class RMStore {
public: // Place public part at the beginning
    RMStore():status(false){}
    // You forgot initialize status member
    explicit RMStore(const char* pcmd):
        command(p?p:""),status(false)
    {}
    explicit RMStore(const std::string& cmd):
        command(cmd),status(false)
    {}
    const std::string& getCommand() const {
         return command;
    }
...
private:
    std::string command;
    std::string result;
    // No need to initialize empty string members
    // explicitly: string default constructors do it.
...
};

Use explicit keyword in that case (in constructors with the single parameter). Without explicit the RMStore::RMStore(type) constructor defines implicit conversion from type to RMStore. As usually it's not a desired effect.

You declared member function prototypes as inline. It's a senseless declaration because:
1. Where is that member function body to substitute it inline?
2. All member function definitions (with bodies) in a class definition are inline by default.

Last edited by ArkM; Dec 19th, 2008 at 5:41 am.

ArkM

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