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#include <string>
#include <iterator>
#include <iostream>
#include <algorithm>
using namespace std;
int main()
{
    string test = "TEST";
    string test2 = "TEST2";
 
    // This (only?) works on Visual Studio
    transform(test2.begin(), test2.end(), test2.begin(), tolower);
 
    // :: global namespace for clib tolower
    transform(test.begin(), test.end(), test.begin(), ::tolower);
 
    cout << test2 << endl;
    cout << test << endl;
    return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:12:65: error: no matching function for call to ‘transform(std::basic_string<char>::iterator, std::basic_string<char>::iterator, std::basic_string<char>::iterator, <unresolved overloaded function type>)’
prog.cpp:12:65: note: candidates are:
In file included from /usr/include/c++/4.7/algorithm:63:0,
                 from prog.cpp:4:
/usr/include/c++/4.7/bits/stl_algo.h:4940:5: note: template<class _IIter, class _OIter, class _UnaryOperation> _OIter std::transform(_IIter, _IIter, _OIter, _UnaryOperation)
/usr/include/c++/4.7/bits/stl_algo.h:4940:5: note:   template argument deduction/substitution failed:
prog.cpp:12:65: note:   couldn't deduce template parameter ‘_UnaryOperation’
In file included from /usr/include/c++/4.7/algorithm:63:0,
                 from prog.cpp:4:
/usr/include/c++/4.7/bits/stl_algo.h:4977:5: note: template<class _IIter1, class _IIter2, class _OIter, class _BinaryOperation> _OIter std::transform(_IIter1, _IIter1, _IIter2, _OIter, _BinaryOperation)
/usr/include/c++/4.7/bits/stl_algo.h:4977:5: note:   template argument deduction/substitution failed:
prog.cpp:12:65: note:   candidate expects 5 arguments, 4 provided

Standard output is empty