#include <boost/type_traits/is_arithmetic.hpp>

#include <boost/type_traits/is_pointer.hpp>

#include <boost/utility/enable_if.hpp>

class test

{

public:

// A constructor that works for any argument list of size 10

template< class... T

, typename boost::enable_if_c< sizeof...( T ) == 10, int >::type = 0

>

test( T&&... );

// A conversion operation that can convert to any arithmetic type

template< class T

, typename boost::enable_if< boost::is_arithmetic< T >, int >::type = 0

>

operator T() const;

// A conversion operation that can convert to any pointer type

template< class T

, typename boost::enable_if< boost::is_pointer< T >, int >::type = 0

>

operator T() const;

};

int main()

{

// Works

test test_( 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 );

// Fails as expected

// test fail_construction( 1, 2, 3, 4, 5 );

// Works by calling the conversion operator enabled for arithmetic types

int arithmetic_object = test_;

// Works by calling the conversion operator enabled for pointer types

int* pointer_object = test_;

// Fails as expected

// struct {} fail_conversion = test_;

}