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POuse operators in templates in c++
 

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  1. POuse operators in templates in c++
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    <p>I am trying to implement a List class using pointers and am trying to implement a function LOCATE(T x) where T is for the template and returns the first position of the element x if found, else returns last position + 1.</p> <p>My functions code is </p> <pre><code>template&lt;class T&gt; int List&lt;T&gt;::locate(T n) const { int size = end(); Node&lt;T&gt; * p = head_; for (int i = 0; i &lt; size; i++) { if (p-&gt;data() == n) // fails on this line return i; p = p-&gt;link(); } return size; // if no match found } </code></pre> <p>I initialise my list with T as string as </p> <pre><code>List&lt;string&gt; myList; </code></pre> <p>but I get an error message</p> <p>'bool std::operator ==(const std::istreambuf_iterator&lt;_Elem,_Traits> &amp;,const std::istreambuf_iterator&lt;_Elem,_Traits> &amp;)' : could not deduce template argument for 'const std::istreambuf_iterator&lt;_Elem,_Traits> &amp;' from 'std::string</p> <p>Why is the error coming up even though the '==' operator is defined for the string class? '</p> <p>The code for Node is </p> <pre><code>template&lt;typename T&gt; class Node { public: // Constructors Node(); Node(T d, Node&lt;T&gt; * l = NULL); //Inspectors T data() const; Node&lt;T&gt; * link() const; // Mutators void data(T d); // assigns new value to Node void link(Node&lt;T&gt; * l); // points this Node to a different one // Destructor ~Node(); private: Node&lt;T&gt; * link_; T data_; }; template&lt;typename T&gt; T Node&lt;T&gt;::data() const { return data_; } template&lt;typename T&gt; Node&lt;T&gt;* Node&lt;T&gt;::link() const { return link_; } </code></pre> <p>The calling code is </p> <pre><code>List&lt;string&gt; test; test.add("abc"); cout &lt;&lt; test.locate("abc") &lt;&lt; endl; </code></pre>
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    1. USJaelebi
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    1. COCan you post the code for Node?
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    2. COWhat does your definition of Node<T> look like? And the full calling code, the one that begins with "List<string> myList;", as above? Thanks.
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      1. USKim Gräsman
    3. COJust posted the definitio of Node<T> and the calling code
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      1. USJaelebi
 

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