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#include <iomanip>
#include <iostream>
#include <algorithm>
#include <string>
 
bool is_palindrome(const std::string& str)
{
	std::string copy(str);
	std::transform(copy.begin(), copy.end(), std::tolower);
 
	if (copy.size() == 0)
	{
		return true;
	}
 
    auto rfirst = copy.rbegin();
	auto rlast = --copy.rend();
	while (rfirst != rlast)
	{
	    if (*rfirst++ != *rlast--)
	        return false;
	}
 
	return true;
}
 
int main()
{
    std::string str{ "KArak" };
    std::cout << std::boolalpha;
    std::cout << "is \"KArak\" palindrome? " << is_palindrom(str) << '\n';
    std::cout << "is \"fuf\" palindrome? " << is_palindrom("fuf") << '\n';
    std::cout << "is empty string palindrome? " << is_palindrom("") << '\n';
    return 0;
}

prog.cpp: In function ‘bool is_palindrome(const string&)’:
prog.cpp:9:55: error: no matching function for call to ‘transform(std::__cxx11::basic_string<char>::iterator, std::__cxx11::basic_string<char>::iterator, <unresolved overloaded function type>)’
  std::transform(copy.begin(), copy.end(), std::tolower);
                                                       ^
In file included from /usr/include/c++/6/algorithm:62:0,
                 from prog.cpp:3:
/usr/include/c++/6/bits/stl_algo.h:4166:5: note: candidate: template<class _IIter, class _OIter, class _UnaryOperation> _OIter std::transform(_IIter, _IIter, _OIter, _UnaryOperation)
     transform(_InputIterator __first, _InputIterator __last,
     ^~~~~~~~~
/usr/include/c++/6/bits/stl_algo.h:4166:5: note:   template argument deduction/substitution failed:
prog.cpp:9:55: note:   candidate expects 4 arguments, 3 provided
  std::transform(copy.begin(), copy.end(), std::tolower);
                                                       ^
In file included from /usr/include/c++/6/algorithm:62:0,
                 from prog.cpp:3:
/usr/include/c++/6/bits/stl_algo.h:4203:5: note: candidate: template<class _IIter1, class _IIter2, class _OIter, class _BinaryOperation> _OIter std::transform(_IIter1, _IIter1, _IIter2, _OIter, _BinaryOperation)
     transform(_InputIterator1 __first1, _InputIterator1 __last1,
     ^~~~~~~~~
/usr/include/c++/6/bits/stl_algo.h:4203:5: note:   template argument deduction/substitution failed:
prog.cpp:9:55: note:   candidate expects 5 arguments, 3 provided
  std::transform(copy.begin(), copy.end(), std::tolower);
                                                       ^
prog.cpp: In function ‘int main()’:
prog.cpp:31:65: error: ‘is_palindrom’ was not declared in this scope
     std::cout << "is \"KArak\" palindrome? " << is_palindrom(str) << '\n';
                                                                 ^

Standard output is empty