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POOverloading < operator c++
 

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  1. POOverloading < operator c++
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    <p>I'm currently trying to overload a less than operator for a class I've build that stores NFL Plays. For my class project, we're inserting data items into a BST. I've overloaded the operator in this way from within my class:</p> <pre><code>friend bool operator&lt; (const NFLData&amp; lhs, const NFLData&amp; rhs){ if((lhs.getOffenseTeam().compare(rhs.getOffenseTeam())) == 0 ){//They're equal, go left return true; } else{ return false; } } </code></pre> <p>However, the lhs and rhs parameters are underlined in red in Visual Studio 2010, and when I try to run it it, I get these errors:</p> <pre><code>c:\project 4draft\nfldata.h(105): error C2228: left of '.compare' must have class/struct/union c:\project 4draft\nfldata.h(105): error C2662: 'NFLData::getOffenseTeam' : cannot convert 'this' pointer from 'const NFLData' to 'NFLData &amp;' Conversion loses qualifiers </code></pre> <p>I removed const from both of the parameters in the function, it no longer underlines any of my code, however when I got to compile, it gives me these errors:</p> <pre><code>\bst.h(82): error C2678: binary '&lt;' : no operator found which takes a left-hand operand of type 'const NFLData' (or there is no acceptable conversion) c:\project 4draft\nfldata.h(104): could be 'bool operator &lt;(NFLData &amp;,NFLData &amp;)' [found using argument-dependent lookup] while trying to match the argument list '(const NFLData, NFLData)' c:\project 4draft\bst.h(79) : while compiling class template member function 'void BST&lt;T&gt;::insert(const T &amp;,BST&lt;T&gt;::TreeNode *&amp;) const' with [ T=NFLData ] c:\project 4draft\test.cpp(35) : see reference to class template instantiation 'BST&lt;T&gt;' being compiled with [ T=NFLData ] c:\project 4draft\bst.h(84): error C2679: binary '&lt;' : no operator found which takes a right-hand operand of type 'const NFLData' (or there is no acceptable conversion) 1&gt; c:\project 4draft\nfldata.h(104): could be 'bool operator &lt;(NFLData &amp;,NFLData &amp;)' [found using argument-dependent lookup] 1&gt; while trying to match the argument list '(NFLData, const NFLData)' </code></pre> <p>I'm trying to figure out why this isn't working, my BST is templated.</p>
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    1. COCan you please post the definition of `NFLData`? Also, since `compare` returns 0 if the two strings are equal, wouldn't your less-than operator actually be an equal-to operator?
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    2. COOne of your functions are not `const`.
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    3. CO@templatetypedef I'm just trying to figure it why it wont compile with a simple case, the logic will be different after I get that sorted out. I posted the class definition.
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