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#include <cstring>
#include <iostream>
using namespace std;
 
template <typename T>
inline T const& max (T const& a, T const& b)
{
    return a < b ? b : a;
}
 
// maximum of two C-strings (call-by-value)
inline char const* max (char const* a, char const* b)
{
    return strcmp(a,b) < 0 ? b : a;
}
 
// maximum of three values of any type (call-by-reference)
template <typename T>
inline T const& max (T const& a, T const& b, T const& c)
{
    return max (max(a,b), c); 
}
 
int main(int argc, char* argv[])
{
    std::cout << ::max(7, 42, 68) << std::endl;
	return 0;
}
 

prog.cpp: In instantiation of ‘const T& max(const T&, const T&, const T&) [with T = int]’:
prog.cpp:26:33:   required from here
prog.cpp:21:24: error: call of overloaded ‘max(const int&, const int&)’ is ambiguous
     return max (max(a,b), c); 
                        ^
prog.cpp:21:24: note: candidates are:
prog.cpp:6:17: note: const T& max(const T&, const T&) [with T = int]
 inline T const& max (T const& a, T const& b)
                 ^
prog.cpp:12:20: note: const char* max(const char*, const char*) <near match>
 inline char const* max (char const* a, char const* b)
                    ^
prog.cpp:12:20: note:   no known conversion for argument 2 from ‘const int’ to ‘const char*’
In file included from /usr/include/c++/4.8/bits/char_traits.h:39:0,
                 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:2:
/usr/include/c++/4.8/bits/stl_algobase.h:216:5: note: const _Tp& std::max(const _Tp&, const _Tp&) [with _Tp = int]
     max(const _Tp& __a, const _Tp& __b)
     ^
prog.cpp: In function ‘const T& max(const T&, const T&, const T&) [with T = int]’:
prog.cpp:22:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

Standard output is empty