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#include <iostream>
#include <string>
#include <cstdlib>
#include <cmath>
 
using namespace std;
long long stringToLongLong(string myString, std::string::iterator pointerToWhereYouLeftItLastTime = NULL, unsigned short base = 10)
{
	std::string::iterator beginningOfNumber = NULL;
 
	long long returnValue = 0;
 
	if (pointerToWhereYouLeftItLastTime == NULL)
	{
		pointerToWhereYouLeftItLastTime = myString.begin();
	}
 
	if (base >= 2 || base <= 10)
	{
		while (pointerToWhereYouLeftItLastTime != myString.end() && (*pointerToWhereYouLeftItLastTime < 48 || *pointerToWhereYouLeftItLastTime > 48 + base - 1))
		{
			pointerToWhereYouLeftItLastTime++;
		}
 
		if (pointerToWhereYouLeftItLastTime != myString.end())
		{
			beginningOfNumber = pointerToWhereYouLeftItLastTime;
		}
		while (pointerToWhereYouLeftItLastTime != myString.end() && *pointerToWhereYouLeftItLastTime >= 48 && *pointerToWhereYouLeftItLastTime <= 48 + base - 1)
		{
			pointerToWhereYouLeftItLastTime++;
		}
	}
	else if (base <= 16)
	{
		while (pointerToWhereYouLeftItLastTime != myString.end() && (*pointerToWhereYouLeftItLastTime < 48 || *pointerToWhereYouLeftItLastTime > 57) && (*pointerToWhereYouLeftItLastTime < 65 || *pointerToWhereYouLeftItLastTime > 65 + base - 11) && (*pointerToWhereYouLeftItLastTime < 97 || *pointerToWhereYouLeftItLastTime > 97 + base - 11))
		{
			pointerToWhereYouLeftItLastTime++;
		}
 
		if (pointerToWhereYouLeftItLastTime != myString.end())
		{
			beginningOfNumber = pointerToWhereYouLeftItLastTime;
		}
		while (pointerToWhereYouLeftItLastTime != myString.end() && (*pointerToWhereYouLeftItLastTime >= 48 && *pointerToWhereYouLeftItLastTime <= 57 || *pointerToWhereYouLeftItLastTime >= 65 && *pointerToWhereYouLeftItLastTime <= 65 + base - 11 || *pointerToWhereYouLeftItLastTime >= 97 && *pointerToWhereYouLeftItLastTime <= 97 + base - 11))
		{
			pointerToWhereYouLeftItLastTime++;
		}
	}
 
	if (beginningOfNumber)
	{
		for (unsigned long long lenght = pointerToWhereYouLeftItLastTime - beginningOfNumber; lenght > 0; lenght--)
		{
			returnValue += (*beginningOfNumber)*(base ^ (lenght - 1));
 
			beginningOfNumber++;
		}
	}
 
	return returnValue;
}
 
int main()
{
	string s = "1000";
	long long l = stringToLongLong(s);
	cout << l << endl;
}

prog.cpp:7:131: error: could not convert ‘0’ from ‘int’ to ‘std::basic_string<char>::iterator {aka __gnu_cxx::__normal_iterator<char*, std::basic_string<char> >}’
 long long stringToLongLong(string myString, std::string::iterator pointerToWhereYouLeftItLastTime = NULL, unsigned short base = 10)
                                                                                                                                   ^
In file included from /usr/include/_G_config.h:15:0,
                 from /usr/include/libio.h:32,
                 from /usr/include/stdio.h:74,
                 from /usr/include/c++/4.8/cstdio:42,
                 from /usr/include/c++/4.8/ext/string_conversions.h:43,
                 from /usr/include/c++/4.8/bits/basic_string.h:2815,
                 from /usr/include/c++/4.8/string:52,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
prog.cpp: In function ‘long long int stringToLongLong(std::string, std::basic_string<char>::iterator, short unsigned int)’:
prog.cpp:9:44: error: conversion from ‘int’ to non-scalar type ‘std::basic_string<char>::iterator {aka __gnu_cxx::__normal_iterator<char*, std::basic_string<char> >}’ requested
  std::string::iterator beginningOfNumber = NULL;
                                            ^
prog.cpp:13:38: error: no match for ‘operator==’ (operand types are ‘std::basic_string<char>::iterator {aka __gnu_cxx::__normal_iterator<char*, std::basic_string<char> >}’ and ‘int’)
  if (pointerToWhereYouLeftItLastTime == NULL)
                                      ^
prog.cpp:13:38: note: candidates are:
In file included from /usr/include/c++/4.8/iosfwd:40:0,
                 from /usr/include/c++/4.8/ios:38,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/postypes.h:216:5: note: template<class _StateT> bool std::operator==(const std::fpos<_StateT>&, const std::fpos<_StateT>&)
     operator==(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
     ^
/usr/include/c++/4.8/bits/postypes.h:216:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/_G_config.h:15:0,
                 from /usr/include/libio.h:32,
                 from /usr/include/stdio.h:74,
                 from /usr/include/c++/4.8/cstdio:42,
                 from /usr/include/c++/4.8/ext/string_conversions.h:43,
                 from /usr/include/c++/4.8/bits/basic_string.h:2815,
                 from /usr/include/c++/4.8/string:52,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
prog.cpp:13:41: note:   ‘std::basic_string<char>::iterator {aka __gnu_cxx::__normal_iterator<char*, std::basic_string<char> >}’ is not derived from ‘const std::fpos<_StateT>’
  if (pointerToWhereYouLeftItLastTime == NULL)
                                         ^
In file included from /usr/include/c++/4.8/bits/stl_algobase.h:64:0,
                 from /usr/include/c++/4.8/bits/char_traits.h:39,
                 from /usr/include/c++/4.8/ios:40,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/stl_pair.h:214:5: note: template<class _T1, class _T2> constexpr bool std::operator==(const std::pair<_T1, _T2>&, const std::pair<_T1, _T2>&)
     operator==(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
     ^
/usr/include/c++/4.8/bits/stl_pair.h:214:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/_G_config.h:15:0,
                 from /usr/include/libio.h:32,
                 from /usr/include/stdio.h:74,
                 from /usr/include/c++/4.8/cstdio:42,
                 from /usr/include/c++/4.8/ext/string_conversions.h:43,
                 from /usr/include/c++/4.8/bits/basic_string.h:2815,
                 from /usr/include/c++/4.8/string:52,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
prog.cpp:13:41: note:   ‘std::basic_string<char>::iterator {aka __gnu_cxx::__normal_iterator<char*, std::basic_string<char> >}’ is not derived from ‘const std::pair<_T1, _T2>’
  if (pointerToWhereYouLeftItLastTime == NULL)
                                         ^
In file included from /usr/include/c++/4.8/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/4.8/bits/char_traits.h:39,
                 from /usr/include/c++/4.8/ios:40,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/stl_iterator.h:291:5: note: template<class _Iterator> bool std::operator==(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_Iterator>&)
     operator==(const reverse_iterator<_Iterator>& __x,
     ^
/usr/include/c++/4.8/bits/stl_iterator.h:291:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/_G_config.h:15:0,
                 from /usr/include/libio.h:32,
                 from /usr/include/stdio.h:74,
                 from /usr/include/c++/4.8/cstdio:42,
                 from /usr/include/c++/4.8/ext/string_conversions.h:43,
                 from /usr/include/c++/4.8/bits/basic_string.h:2815,
                 from /usr/include/c++/4.8/string:52,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
prog.cpp:13:41: note:   ‘std::basic_string<char>::iterator {aka __gnu_cxx::__normal_iterator<char*, std::basic_string<char> >}’ is not derived from ‘const std::reverse_iterator<_Iterator>’
  if (pointerToWhereYouLeftItLastTime == NULL)
                                         ^
In file included from /usr/include/c++/4.8/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/4.8/bits/char_traits.h:39,
                 from /usr/include/c++/4.8/ios:40,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/stl_iterator.h:341:5: note: template<class _IteratorL, class _IteratorR> bool std::operator==(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_IteratorR>&)
     operator==(const reverse_iterator<_IteratorL>& __x,
     ^
/usr/include/c++/4.8/bits/stl_iterator.h:341:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/_G_config.h:15:0,
                 from /usr/include/libio.h:32,
                 from /usr/include/stdio.h:74,
                 from /usr/include/c++/4.8/cstdio:42,
                 from /usr/include/c++/4.8/ext/string_conversions.h:43,
                 from /usr/include/c++/4.8/bits/basic_string.h:2815,
                 from /usr/include/c++/4.8/string:52,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
prog.cpp:13:41: note:   ‘std::basic_string<char>::iterator {aka __gnu_cxx::__normal_iterator<char*, std::basic_string<char> >}’ is not derived from ‘const std::reverse_iterator<_Iterator>’
  if (pointerToWhereYouLeftItLastTime == NULL)
                                         ^
In file included from /usr/include/c++/4.8/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/4.8/bits/char_traits.h:39,
                 from /usr/include/c++/4.8/ios:40,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/stl_iterator.h:1031:5: note: template<class _IteratorL, class _IteratorR> bool std::operator==(const std::move_iterator<_Iterator>&, const std::move_iterator<_IteratorR>&)
     operator==(const move_iterator<_IteratorL>& __x,
     ^
/usr/include/c++/4.8/bits/stl_iterator.h:1031:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/_G_config.h:15:0,
                 from /usr/include/libio.h:32,
                 from /usr/include/stdio.h:74,
                 from /usr/include/c++/4.8/cstdio:42,
                 from /usr/include/c++/4.8/ext/string_conversions.h:43,
                 from /usr/include/c++/4.8/bits/basic_string.h:2815,
                 from /usr/include/c++/4.8/string:52,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
prog.cpp:13:41: note:   ‘std::basic_string<char>::iterator {aka __gnu_cxx::__normal_iterator<char*, std::basic_string<char> >}’ is not derived from ‘const std::move_iterator<_Iterator>’
  if (pointerToWhereYouLeftItLastTime == NULL)
                                         ^
In file included from /usr/include/c++/4.8/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/4.8/bits/char_traits.h:39,
                 from /usr/include/c++/4.8/ios:40,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/stl_iterator.h:1037:5: note: template<class _Iterator> bool std::operator==(const std::move_iterator<_Iterator>&, const std::move_iterator<_Iterator>&)
     operator==(const move_iterator<_Iterator>& __x,
     ^
/usr/include/c++/4.8/bits/stl_iterator.h:1037:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/_G_config.h:15:0,
                 from /usr/include/libio.h:32,
                 from /usr/include/stdio.h:74,
                 from /usr/include/c++/4.8/cstdio:42,
                 from /usr/include/c++/4.8/ext/string_conversions.h:43,
                 from /usr/include/c++/4.8/bits/basic_string.h:2815,
                 from /usr/include/c++/4.8/string:52,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
prog.cpp:13:41: note:   ‘std::basic_string<char>::iterator {aka __gnu_cxx::__normal_iterator<char*, std::basic_string<char> >}’ is not derived from ‘const std::move_iterator<_Iterator>’
  if (pointerToWhereYouLeftItLastTime == NULL)
                                         ^
In file included from /usr/include/c++/4.8/string:41:0,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/allocator.h:128:5: note: template<class _T1, class _T2> bool std::operator==(const std::allocator<_CharT>&, const std::allocator<_T2>&)
     operator==(const allocator<_T1>&, const allocator<_T2>&)
     ^
/usr/include/c++/4.8/bits/allocator.h:128:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/_G_config.h:15:0,
                 from /usr/include/libio.h:32,
                 from /usr/include/stdio.h:74,
                 from /usr/include/c++/4.8/cstdio:42,
                 from /usr/include/c++/4.8/ext/string_conversions.h:43,
                 from /usr/include/c++/4.8/bits/basic_string.h:2815,
                 from /usr/include/c++/4.8/string:52,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
prog.cpp:13:41: note:   ‘std::basic_string<char>::iterator {aka __gnu_cxx::__normal_iterator<char*, std::basic_string<char> >}’ is not derived from ‘const std::allocator<_CharT>’
  if (pointerToWhereYouLeftItLastTime == NULL)
                                         ^
In file included from /usr/include/c++/4.8/string:41:0,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/allocator.h:133:5: note: template<class _Tp> bool std::operator==(const std::allocator<_CharT>&, const std::allocator<_CharT>&)
     operator==(const allocator<_Tp>&, const allocator<_Tp>&)
     ^
/usr/include/c++/4.8/bits/allocator.h:133:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/_G_config.h:15:0,
                 from /usr/include/libio.h:32,
                 from /usr/include/stdio.h:74,
                 from /usr/include/c++/4.8/cstdio:42,
                 from /usr/include/c++/4.8/ext/string_conversions.h:43,
                 from /usr/include/c++/4.8/bits/basic_string.h:2815,
                 from /usr/include/c++/4.8/string:52,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
prog.cpp:13:41: note:   ‘std::basic_string<char>::iterator {aka __gnu_cxx::__normal_iterator<char*, std::basic_string<char> >}’ is not derived from ‘const std::allocator<_CharT>’
  if (pointerToWhereYouLeftItLastTime == NULL)
                                         ^
In file included from /usr/include/c++/4.8/string:52:0,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/basic_string.h:2486:5: note: template<class _CharT, class _Traits, class _Alloc> bool std::operator==(const std::basic_string<_CharT, _Traits, _Alloc>&, const std::basic_string<_CharT, _Traits, _Alloc>&)
     operator==(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
     ^
/usr/include/c++/4.8/bits/basic_string.h:2486:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/_G_config.h:15:0,
                 from /usr/include/libio.h:32,
                 from /usr/include/stdio.h:74,
                 from /usr/include/c++/4.8/cstdio:42,
                 from /usr/include/c++/4.8/ext/string_conversions.h:43,
                 from /usr/include/c++/4.8/bits/basic_string.h:2815,
                 from /usr/include/c++/4.8/string:52,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
prog.cpp:13:41: note:   ‘std::basic_string<char>::iterator {aka __gnu_cxx::__normal_iterator<char*, std::basic_string<char> >}’ is not derived from ‘const std::basic_string<_CharT, _Traits, _Alloc>’
  if (pointerToWhereYouLeftItLastTime == NULL)
                                         ^
In file included from /usr/include/c++/4.8/string:52:0,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/basic_string.h:2493:5: note: template<class _CharT> typename __gnu_cxx::__enable_if<std::__is_char<_Tp>::__value, bool>::__type std::operator==(const std::basic_string<_CharT>&, const std::basic_string<_CharT>&)
     operator==(const basic_string<_CharT>& __lhs,
     ^
/usr/include/c++/4.8/bits/basic_string.h:2493:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/_G_config.h:15:0,
                 from /usr/include/libio.h:32,
                 from /usr/include/stdio.h:74,
                 from /usr/include/c++/4.8/cstdio:42,
                 from /usr/include/c++/4.8/ext/string_conversions.h:43,
                 from /usr/include/c++/4.8/bits/basic_string.h:2815,
                 from /usr/include/c++/4.8/string:52,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
prog.cpp:13:41: note:   ‘std::basic_string<char>::iterator {aka __gnu_cxx::__normal_iterator<char*, std::basic_string<char> >}’ is not derived from ‘const std::basic_string<_CharT>’
  if (pointerToWhereYouLeftItLastTime == NULL)
                                         ^
In file included from /usr/include/c++/4.8/string:52:0,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/basic_string.h:2507:5: note: template<class _CharT, class _Traits, class _Alloc> bool std::operator==(const _CharT*, const std::basic_string<_CharT, _Traits, _Alloc>&)
     operator==(const _CharT* __lhs,
     ^
/usr/include/c++/4.8/bits/basic_string.h:2507:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/_G_config.h:15:0,
                 from /usr/include/libio.h:32,
                 from /usr/include/stdio.h:74,
                 from /usr/include/c++/4.8/cstdio:42,
                 from /usr/include/c++/4.8/ext/string_conversions.h:43,
                 from /usr/include/c++/4.8/bits/basic_string.h:2815,
                 from /usr/include/c++/4.8/string:52,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
prog.cpp:13:41: note:   mismatched types ‘const _CharT*’ and ‘__gnu_cxx::__normal_iterator<char*, std::basic_string<char> >’
  if (pointerToWhereYouLeftItLastTime == NULL)
                                         ^
In file included from /usr/include/c++/4.8/string:52:0,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/basic_string.h:2519:5: note: template<class _CharT, class _Traits, class _Alloc> bool std::operator==(const std::basic_string<_CharT, _Traits, _Alloc>&, const _CharT*)
     operator==(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
     ^
/usr/include/c++/4.8/bits/basic_string.h:2519:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/_G_config.h:15:0,
                 from /usr/include/libio.h:32,
                 from /usr/include/stdio.h:74,
                 from /usr/include/c++/4.8/cstdio:42,
                 from /usr/include/c++/4.8/ext/string_conversions.h:43,
                 from /usr/include/c++/4.8/bits/basic_string.h:2815,
                 from /usr/include/c++/4.8/string:52,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
prog.cpp:13:41: note:   ‘std::basic_string<char>::iterator {aka __gnu_cxx::__normal_iterator<char*, std::basic_string<char> >}’ is not derived from ‘const std::basic_string<_CharT, _Traits, _Alloc>’
  if (pointerToWhereYouLeftItLastTime == NULL)
                                         ^
In file included from /usr/include/c++/4.8/bits/locale_facets.h:48:0,
                 from /usr/include/c++/4.8/bits/basic_ios.h:37,
                 from /usr/include/c++/4.8/ios:44,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/streambuf_iterator.h:204:5: note: template<class _CharT, class _Traits> bool std::operator==(const std::istreambuf_iterator<_CharT, _Traits>&, const std::istreambuf_iterator<_CharT, _Traits>&)
     operator==(const istreambuf_iterator<_CharT, _Traits>& __a,
     ^
/usr/include/c++/4.8/bits/streambuf_iterator.h:204:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/_G_config.h:15:0,
                 from /usr/include/libio.h:32,
                 from /usr/include/stdio.h:74,
                 from /usr/include/c++/4.8/cstdio:42,
                 from /usr/include/c++/4.8/ext/string_conversions.h:43,
                 from /usr/include/c++/4.8/bits/basic_string.h:2815,
                 from /usr/include/c++/4.8/string:52,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
prog.cpp:13:41: note:   ‘std::basic_string<char>::iterator {aka __gnu_cxx::__normal_iterator<char*, std::basic_string<char> >}’ is not derived from ‘const std::istreambuf_iterator<_CharT, _Traits>’
  if (pointerToWhereYouLeftItLastTime == NULL)
                                         ^
In file included from /usr/include/i386-linux-gnu/c++/4.8/bits/c++allocator.h:33:0,
                 from /usr/include/c++/4.8/bits/allocator.h:46,
                 from /usr/include/c++/4.8/string:41,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.8/ext/new_allocator.h:139:5: note: template<class _Tp> bool __gnu_cxx::operator==(const __gnu_cxx::new_allocator<_Tp>&, const __gnu_cxx::new_allocator<_Tp>&)
     operator==(const new_allocator<_Tp>&, const new_allocator<_Tp>&)
     ^
/usr/include/c++/4.8/ext/new_allocator.h:139:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/_G_config.h:15:0,
                 from /usr/include/libio.h:32,
                 from /usr/include/stdio.h:74,
                 from /usr/include/c++/4.8/cstdio:42,
                 from /usr/include/c++/4.8/ext/string_conversions.h:43,
                 from /usr/include/c++/4.8/bits/basic_string.h:2815,
                 from /usr/include/c++/4.8/string:52,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
prog.cpp:13:41: note:   ‘std::basic_string<char>::iterator {aka __gnu_cxx::__normal_iterator<char*, std::basic_string<char> >}’ is not derived from ‘const __gnu_cxx::new_allocator<_Tp>’
  if (pointerToWhereYouLeftItLastTime == NULL)
                                         ^
In file included from /usr/include/c++/4.8/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/4.8/bits/char_traits.h:39,
                 from /usr/include/c++/4.8/ios:40,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/stl_iterator.h:811:5: note: template<class _Iterator, class _Container> bool __gnu_cxx::operator==(const __gnu_cxx::__normal_iterator<_Iterator, _Container>&, const __gnu_cxx::__normal_iterator<_Iterator, _Container>&)
     operator==(const __normal_iterator<_Iterator, _Container>& __lhs,
     ^
/usr/include/c++/4.8/bits/stl_iterator.h:811:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/_G_config.h:15:0,
                 from /usr/include/libio.h:32,
                 from /usr/include/stdio.h:74,
                 from /usr/include/c++/4.8/cstdio:42,
                 from /usr/include/c++/4.8/ext/string_conversions.h:43,
                 from /usr/include/c++/4.8/bits/basic_string.h:2815,
                 from /usr/include/c++/4.8/string:52,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
prog.cpp:13:41: note:   mismatched types ‘const __gnu_cxx::__normal_iterator<_Iterator, _Container>’ and ‘int’
  if (pointerToWhereYouLeftItLastTime == NULL)
                                         ^
In file included from /usr/include/c++/4.8/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/4.8/bits/char_traits.h:39,
                 from /usr/include/c++/4.8/ios:40,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/stl_iterator.h:805:5: note: template<class _IteratorL, class _IteratorR, class _Container> bool __gnu_cxx::operator==(const __gnu_cxx::__normal_iterator<_IteratorL, _Container>&, const __gnu_cxx::__normal_iterator<_IteratorR, _Container>&)
     operator==(const __normal_iterator<_IteratorL, _Container>& __lhs,
     ^
/usr/include/c++/4.8/bits/stl_iterator.h:805:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/_G_config.h:15:0,
                 from /usr/include/libio.h:32,
                 from /usr/include/stdio.h:74,
                 from /usr/include/c++/4.8/cstdio:42,
                 from /usr/include/c++/4.8/ext/string_conversions.h:43,
                 from /usr/include/c++/4.8/bits/basic_string.h:2815,
                 from /usr/include/c++/4.8/string:52,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
prog.cpp:13:41: note:   mismatched types ‘const __gnu_cxx::__normal_iterator<_IteratorR, _Container>’ and ‘int’
  if (pointerToWhereYouLeftItLastTime == NULL)
                                         ^
prog.cpp:45:103: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
   while (pointerToWhereYouLeftItLastTime != myString.end() && (*pointerToWhereYouLeftItLastTime >= 48 && *pointerToWhereYouLeftItLastTime <= 57 || *pointerToWhereYouLeftItLastTime >= 65 && *pointerToWhereYouLeftItLastTime <= 65 + base - 11 || *pointerToWhereYouLeftItLastTime >= 97 && *pointerToWhereYouLeftItLastTime <= 97 + base - 11))
                                                                                                       ^
prog.cpp:45:283: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
   while (pointerToWhereYouLeftItLastTime != myString.end() && (*pointerToWhereYouLeftItLastTime >= 48 && *pointerToWhereYouLeftItLastTime <= 57 || *pointerToWhereYouLeftItLastTime >= 65 && *pointerToWhereYouLeftItLastTime <= 65 + base - 11 || *pointerToWhereYouLeftItLastTime >= 97 && *pointerToWhereYouLeftItLastTime <= 97 + base - 11))
                                                                                                                                                                                                                                                                                           ^
prog.cpp:51:23: error: could not convert ‘beginningOfNumber’ from ‘std::basic_string<char>::iterator {aka __gnu_cxx::__normal_iterator<char*, std::basic_string<char> >}’ to ‘bool’
  if (beginningOfNumber)
                       ^
prog.cpp: In function ‘int main()’:
prog.cpp:67:34: error: could not convert ‘0’ from ‘int’ to ‘std::basic_string<char>::iterator {aka __gnu_cxx::__normal_iterator<char*, std::basic_string<char> >}’
  long long l = stringToLongLong(s);
                                  ^

Standard output is empty