template<typename _Rep, typename _Period>
struct duration
{
+ static_assert(!__is_duration<_Rep>::value, "rep cannot be a duration");
+ static_assert(__is_ratio<_Period>::value,
+ "period must be a specialization of ratio");
+ static_assert(_Period::num > 0, "period must be positive");
+
private:
template<typename _Rep2>
using __is_float = treat_as_floating_point<_Rep2>;
using rep = _Rep;
using period = typename _Period::type;
- static_assert(!__is_duration<_Rep>::value, "rep cannot be a duration");
- static_assert(__is_ratio<_Period>::value,
- "period must be a specialization of ratio");
- static_assert(_Period::num > 0, "period must be positive");
-
// 20.11.5.1 construction / copy / destroy
constexpr duration() = default;