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POTemplate function giving compilation error
 

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  1. POTemplate function giving compilation error
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    <blockquote> <p><strong>Possible Duplicate:</strong><br> <a href="https://stackoverflow.com/questions/3149859/stdmapconst-iterator-template-compilation-error">std::map::const_iterator template compilation error</a> </p> </blockquote> <p>The idea is to create a function which takes the container type as a Template parameter. Since maps have to summed up differently compared to other sequential containers I overloaded the Sum function for the map as shown below.</p> <p>This is the function which is giving me errors:</p> <pre><code>template&lt;typename T1, typename T2&gt; double Sum(const map&lt;T1,T2&gt;&amp; input) { double finalSum=0; map&lt;T1,T2&gt;::const_iterator iter_begin=input.begin(); map&lt;T1,T2&gt;::const_iterator iter_end=input.end(); for(iter_begin; iter_begin!=iter_end; ++iter_begin) { finalSum=finalSum+(iter_begin)-&gt;second; } return finalSum; } </code></pre> <p>Error:</p> <p>1>c:\documents and settings\keep\my documents\visual studio 2010\projects\level 7\exercise 2\exercise 2\sum.h(34): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int</p> <p>1>c:\documents and settings\keep\my documents\visual studio 2010\projects\level 7\exercise 2\exercise 2\sum.h(34): error C2143: syntax error : missing ',' before '&lt;'</p> <p>This function is a part of the header file. My header file includes the function definitions also.</p> <p>Few things: 1. I tried with typename but I might have been wrong. Templates are not my strong area yet. Feel free to point if typename is needed somewhere. Inline keyword will help?</p> <ol start="2"> <li><strong>The same code is compiling fine on my Guide's machine.</strong> Mine is VC++ 2010 Express SP1. I do not know what his version of VC++ is.</li> </ol> <p>Thanks in advance.</p> <p><strong>EDIT: Posting the whole Header file.With typename addition as suggested</strong>. But same error. The first version of Sum is compiling fine without typename. The second one overloaded for map is giving issues.</p> <pre><code>#ifndef SUM_H #define SUM_H template&lt;typename T&gt; double Sum(const T&amp; input) { double finalSum=0; T::const_iterator iter_begin=input.begin(); T::const_iterator iter_end=input.end(); for(iter_begin; iter_begin!=iter_end; ++iter_begin) { finalSum=finalSum+(*iter_begin); } return finalSum; } //Mysterion !!!!! template&lt;typename T1, typename T2&gt; double Sum(const map&lt;T1,T2&gt;&amp; input) { double finalSum=0; typename map&lt;T1,T2&gt;::const_iterator iter_begin=input.begin(); typename map&lt;T1,T2&gt;::const_iterator iter_end=input.end(); for(iter_begin; iter_begin!=iter_end; ++iter_begin) { finalSum=finalSum+(iter_begin)-&gt;second; } return finalSum; } #endif </code></pre> <p>The error is coming at: double Sum(const map&amp; input)</p>
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