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#include <complex>
#include <iostream>
 
using namespace std;
 
int main(void)
{
    complex<int> z(20, 200);
    cout << abs<int>(z) << endl;
    return 0;
}

/usr/lib/gcc/i686-pc-linux-gnu/4.3.4/include/g++-v4/complex: In function ‘_Tp std::__complex_abs(const std::complex<_Tp>&) [with _Tp = int]’:
/usr/lib/gcc/i686-pc-linux-gnu/4.3.4/include/g++-v4/complex:579:   instantiated from ‘_Tp std::abs(const std::complex<_Tp>&) [with _Tp = int]’
prog.cpp:9:   instantiated from here
/usr/lib/gcc/i686-pc-linux-gnu/4.3.4/include/g++-v4/complex:558: error: call of overloaded ‘abs(int&)’ is ambiguous
/usr/lib/gcc/i686-pc-linux-gnu/4.3.4/include/g++-v4/cmath:99: note: candidates are: double std::abs(double)
/usr/lib/gcc/i686-pc-linux-gnu/4.3.4/include/g++-v4/cmath:103: note:                 float std::abs(float)
/usr/lib/gcc/i686-pc-linux-gnu/4.3.4/include/g++-v4/cmath:107: note:                 long double std::abs(long double)
/usr/lib/gcc/i686-pc-linux-gnu/4.3.4/include/g++-v4/complex:558: error: call of overloaded ‘abs(int&)’ is ambiguous
/usr/lib/gcc/i686-pc-linux-gnu/4.3.4/include/g++-v4/cmath:99: note: candidates are: double std::abs(double)
/usr/lib/gcc/i686-pc-linux-gnu/4.3.4/include/g++-v4/cmath:103: note:                 float std::abs(float)
/usr/lib/gcc/i686-pc-linux-gnu/4.3.4/include/g++-v4/cmath:107: note:                 long double std::abs(long double)

Standard output is empty