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POOverloading function doesn't work with complex
 

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  1. POOverloading function doesn't work with complex
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    <p>I have written this simple C++ code to swap any two variables. It works for int and double, but doesn't work for complex numbers, any idea why?</p> <pre><code>#include &lt;iostream&gt; #include &lt;complex&gt; using std::cout; using std::endl; using std::complex; template &lt;class T&gt; inline void swap(T&amp; d, T&amp; s) { T temp = d; d = s; s = temp; } int main() { int m=5, n=10; double x=5.3, y=10.6; complex&lt;double&gt; r(2.4, 3.5), s(3.4, 6.7); cout &lt;&lt; "inputs: " &lt;&lt; m &lt;&lt; " , " &lt;&lt; n &lt;&lt; endl; swap(m, n); cout &lt;&lt; "outputs: " &lt;&lt; m &lt;&lt; " , " &lt;&lt; n &lt;&lt; endl; cout &lt;&lt; "double inputs: " &lt;&lt; x &lt;&lt; " , " &lt;&lt; y &lt;&lt; endl; swap(x, y); cout &lt;&lt; "double outputs: " &lt;&lt; x &lt;&lt; " , " &lt;&lt; y &lt;&lt; endl; cout &lt;&lt; "complex inputs: " &lt;&lt; r &lt;&lt; " , " &lt;&lt; s &lt;&lt; endl; swap(r, s); cout &lt;&lt; "complex outputs: " &lt;&lt; r &lt;&lt; " , " &lt;&lt; s &lt;&lt; endl; } </code></pre> <p>This is the error:</p> <pre><code>g++ 02.swap.template.cpp -o c.out.02 02.swap.template.cpp: In function ‘int main()’: 02.swap.template.cpp:37:13: error: call of overloaded ‘swap(std::complex&lt;double&gt;&amp;, std::complex&lt;double&gt;&amp;)’ is ambiguous 02.swap.template.cpp:37:13: note: candidates are: 02.swap.template.cpp:13:13: note: void swap(T&amp;, T&amp;) [with T = std::complex&lt;double&gt;] /usr/include/c++/4.6/bits/move.h:122:5: note: void std::swap(_Tp&amp;, _Tp&amp;) [with _Tp = std::complex&lt;double&gt;] </code></pre>
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    1. COThere's already a `std::swap`. Use that. In your case, it's because of ADL.
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    2. COI am trying to learn the use of template, and this is an example from coursera lectures! So, why it doesn't work
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    3. CO@chris: Are you sure about this? ADL should not introduce ambiguities, since it's only considered *after* ordinary lookup has failed.
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