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#include <iostream>
using namespace std;
 
template< typename T > class buffer
{
	public:
	T * data;
	buffer(){data = new T[10];}
    const T & operator [] ( size_t ) const;
          T & operator [] ( size_t );
 
    operator const T * () const;
    operator       T * ();
};
 
int main() {
	buffer< int > buf;
    buf[ 0 ]; // Generates an error
	return 0;
}

prog.cpp: In function 'int main()':
prog.cpp:18:12: warning: ISO C++ says that these are ambiguous, even though the worst conversion for the first is better than the worst conversion for the second:
     buf[ 0 ]; // Generates an error
            ^
prog.cpp:10:15: note: candidate 1: T& buffer<T>::operator[](size_t) [with T = int; size_t = unsigned int]
           T & operator [] ( size_t );
               ^
prog.cpp:18:12: note: candidate 2: operator[](int*, int) <built-in>
     buf[ 0 ]; // Generates an error
            ^
prog.cpp:18:12: warning: ISO C++ says that these are ambiguous, even though the worst conversion for the first is better than the worst conversion for the second:
prog.cpp:10:15: note: candidate 1: T& buffer<T>::operator[](size_t) [with T = int; size_t = unsigned int]
           T & operator [] ( size_t );
               ^
prog.cpp:18:12: note: candidate 2: operator[](const int*, int) <built-in>
     buf[ 0 ]; // Generates an error
            ^
/home/ntCEfH/cc1Sg4bI.o: In function `main':
prog.cpp:(.text.startup+0x24): undefined reference to `buffer<int>::operator[](unsigned int)'
collect2: error: ld returned 1 exit status

Standard output is empty