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POc++ compilation error using #include<algorithm>
 

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  1. POc++ compilation error using #include<algorithm>
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    <p>I'm having compilation error whenever i try to compile the programme.</p> <p>when I try to remove the "sort" function in this programme everything is fine, problem start arising when I use the "sort" function. </p> <p>Is there any other way to solve this issue or there no way i could use #include ? It's the same when I use the "swap" function. </p> <p>here's the code</p> <pre><code>#include &lt;iostream&gt; #include &lt;algorithm&gt; #include &lt;vector&gt; #include &lt;iterator&gt; #include &lt;vector&gt; #include &lt;string&gt; using namespace std; class tropical { public: string name; int price; }; bool sortByName(tropical &amp;t1, tropical &amp;t2); // void displayfruits(vector&lt;tropical&gt; fruitlist) { cout &lt;&lt; "Name \t\tPrice" &lt;&lt; endl &lt;&lt; "==========\t=====" &lt;&lt; endl; for(int i=0;i&lt;10;i++) //displays all fruits' names and prices { cout &lt;&lt; fruitlist[i].name &lt;&lt; " \t" &lt;&lt; fruitlist[i].price &lt;&lt; endl; } cout &lt;&lt; endl; } int main() { int sortchoice; string searchfruit; string fruitname[] = {"Avocado", "Papaya", "Grapefruit", "Pineapple", "Jackfruit", "Orange", "Honeydew", "Mangosteen", "Banana", "Durian"}; int fruitprice[] = {1, 4, 6, 2, 10, 3, 9, 7, 5, 8}; vector&lt;tropical&gt; fruitlist; tropical fruit; vector&lt;tropical&gt;::iterator it; for(int i=0; i&lt;10; i++) { fruit.name = fruitname[i]; fruit.price = fruitprice[i]; fruitlist.push_back(fruit); } displayfruits(fruitlist); sort (fruitlist.begin(), fruitlist.end(), sortByName); displayfruits(fruitlist); } bool sortByName(tropical &amp;t1, tropical &amp;t2) { return t1.name &lt; t2.name; } </code></pre> <p>this is error i'm getting</p> <pre><code> In file included from c:\mingw\bin\../lib/gcc/mingw32/4.6.2/include/c++/algorithm:63:0, from ..\src\tutorial 3 - Constants and Formatting Decimals.cpp:2: c:\mingw\bin\../lib/gcc/mingw32/4.6.2/include/c++/bits/stl_algo.h: In function '_RandomAccessIterator std::__unguarded_partition(_RandomAccessIterator, _RandomAccessIterator, const _Tp&amp;, _Compare) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator&lt;tropical*, std::vector&lt;tropical&gt; &gt;, _Tp = tropical, _Compare = bool (*)(tropical&amp;, tropical&amp;)]': c:\mingw\bin\../lib/gcc/mingw32/4.6.2/include/c++/bits/stl_algo.h:2265:78: instantiated from '_RandomAccessIterator std::__unguarded_partition_pivot(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator&lt;tropical*, std::vector&lt;tropical&gt; &gt;, _Compare = bool (*)(tropical&amp;, tropical&amp;)]' c:\mingw\bin\../lib/gcc/mingw32/4.6.2/include/c++/bits/stl_algo.h:2306:62: instantiated from 'void std::__introsort_loop(_RandomAccessIterator, _RandomAccessIterator, _Size, _Compare) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator&lt;tropical*, std::vector&lt;tropical&gt; &gt;, _Size = int, _Compare = bool (*)(tropical&amp;, tropical&amp;)]' c:\mingw\bin\../lib/gcc/mingw32/4.6.2/include/c++/bits/stl_algo.h:5445:4: instantiated from 'void std::sort(_RAIter, _RAIter, _Compare) [with _RAIter = __gnu_cxx::__normal_iterator&lt;tropical*, std::vector&lt;tropical&gt; &gt;, _Compare = bool (*)(tropical&amp;, tropical&amp;)]' ..\src\tutorial 3 - Constants and Formatting Decimals.cpp:56:61: instantiated from here c:\mingw\bin\../lib/gcc/mingw32/4.6.2/include/c++/bits/stl_algo.h:2233:4: error: invalid initialization of reference of type 'tropical&amp;' from expression of type 'const tropical' c:\mingw\bin\../lib/gcc/mingw32/4.6.2/include/c++/bits/stl_algo.h:2236:4: error: invalid initialization of reference of type 'tropical&amp;' from expression of type 'const tropical' </code></pre> <p>I've tried running this example which i've found on the web (the source attached below) and i'm facing the same problem? why is this so?</p> <p><a href="http://www.daniweb.com/software-development/cpp/threads/242984/sorting-multiple-array-containers-with-related-elements#post1064721" rel="nofollow">http://www.daniweb.com/software-development/cpp/threads/242984/sorting-multiple-array-containers-with-related-elements#post1064721</a></p>
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