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POerror C2593: 'operator <<' is ambiguous
 

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  1. POerror C2593: 'operator <<' is ambiguous
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    <p>i have some problems with template operator&lt;&lt; having a code:</p> <pre><code>class Manager { multiset&lt;Advertising*, CompareAddPtr &gt; AddToSend; LinkedList&lt;Client &gt; ClientList; LinkedList&lt;Client &gt; ActiveClientList; list&lt;string&gt; initList; list&lt;string&gt; commandsList; } </code></pre> <p>in this class i try to use this method:</p> <pre><code>void Manager:: PrintAllClientDetialsTofile() { ofstream myfile; myfile.open ("Result.txt",ios::app); myfile &lt;&lt; ClientList; myfile &lt;&lt; "\n"; myfile.close(); } </code></pre> <p>my &lt;&lt; function in the template class:</p> <pre><code>template &lt;class L&gt; ostream &amp; operator&lt;&lt;(ostream&amp; os,const LinkedList&lt;L&gt;&amp; listToprint) { Link&lt;T&gt; * tmp = listToprint-&gt;pm_head; for(int i=0;i&lt;listToprint.GetNumOfElements();i++) { os&lt;&lt;*(tmp-&gt;m_data); tmp=tmp-&gt;m_next; } return os; } </code></pre> <p>i also have template class </p> <pre><code>template &lt;class T&gt; class Link { private: T* m_data; Link* m_next; Link* m_prev; </code></pre> <p>the client class:</p> <pre><code>#pragma once #ifndef _CLIENT_H_ #define _CLIENT_H_ #include &lt;string&gt; #include &lt;set&gt; #include "Advertising.h" #include "Email.h" #include "FaceBook.h" #include "Msn.h" #include "Sms.h" #include "Bill.h" #include &lt;ostream&gt; #include "LinkedList.h" using namespace std; struct CompareAddPtrClient : public std::binary_function&lt;Advertising*, Advertising*, bool&gt; { bool operator()(Advertising* x, Advertising* y) const { if(x-&gt;GetMadeOrderTime()&lt;y-&gt;GetMadeOrderTime()) return true; else return false; } }; class Client { string m_clientname; string m_companyName; string m_cod;//check if have length of 15 string m_telephone; string m_email; int m_lastOrder; int m_orderUntill; multiset&lt;Advertising*, CompareAddPtrClient &gt; m_clientsAdds; LinkedList&lt;Bill &gt; BillsForClient; public: Client(string clientName,string companyName,string cod,string telephone,string email); Client(string clientName); ~Client(void); //getters LinkedList&lt;Bill &gt;* GetClientsBills(){return &amp;BillsForClient;} const string GetTelephoneNum()const {return m_telephone;} const string GetEmail()const{return m_email;} const int GetClientUntill()const{return m_orderUntill;} const int GetLastOrderTime()const{return m_lastOrder;} //setters void UpdateLastTimeMadeOrder(int theday){m_lastOrder=theday;} void UpdateOrderUntill(int theday){m_orderUntill=theday+7;} //functions friend ostream &amp; operator&lt;&lt;(ostream&amp; os,const Client&amp; print); bool operator==(const Client &amp; other)const; void PrintOrdersForClient()const; void AddAdvertuseForClient(Advertising * add); void LastOrdersByClient(); void PrintClientsBills(); }; #endif </code></pre> <p>when i use this function to print my list i get compile error:</p> <blockquote> <p>error C2593: 'operator &lt;&lt;' is ambiguous</p> </blockquote> <p>i found similar question that was asked <a href="https://stackoverflow.com/questions/3319837/ambiguous-operator">the question</a> but i don't understand how to solve this problem.</p> <p>thank you :)</p>
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    1. USCommunity
    1. USinna karpasas
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    1. COWhy are there two different classes for linked lists in that example?
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      1. POerror C2593: 'operator <<' is ambiguous
      1. USThanatos
    2. COAlso, your `operator <<` uses `T`, but the template type is `L`. Are you showing us your code, exactly?
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      1. POerror C2593: 'operator <<' is ambiguous
      1. USThanatos
    3. COI really wonder if this would be an extract of real code that will be used by a company, or just an example?
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      1. POerror C2593: 'operator <<' is ambiguous
      1. USstijn
 

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