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// PR c++/56041
// { dg-do compile { target c++11 } }
template< class T, T v >
struct integral_constant
{
using type = integral_constant<T,v>;
using value_type = T;
static constexpr T value = v;
constexpr operator T ( ) noexcept { return value; }
};
using true_type = integral_constant<bool, true>;
using false_type = integral_constant<bool, false>;
template< bool b, class T = void > struct enable_if { using type = T; };
template< class T > struct enable_if<false, T> { };
template< class T,
class = typename enable_if< true_type{} // should compile; doesn't
, T>::type
>
T try_it( ) { return T{}; }
int main( )
{
static_assert( true_type{} , "failed test 1!" );
static_assert( true_type{} , "failed test 2!" );
static_assert( ! false_type{} , "failed test 3!" );
static_assert( !! true_type{} , "failed test 4!" );
return try_it<int>();
}
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