Enum-only templated class

Question

Is there any way to ensure that a templated class will fail to compile if a specific template argument is supplied with something other than a strongly-typed enumeration (i.e. enum class)?

Community · Accepted Answer · 2017-05-23 12:33:15Z

7

Use a trait and static_assert.

I.e.

template <class T>
using is_scoped_enum = std::integral_constant<bool, !std::is_convertible<T, int>{}
                                                  && std::is_enum<T>{}>;

template <typename T>
struct myTemplate
{
   static_assert( is_scoped_enum<T>{}, "Invalid type argument!" );
};

^{(Taken from this answer.)}
Demo.

edited May 23, 2017 at 12:33

CommunityBot

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answered Nov 23, 2014 at 1:08

Columbo

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1 Comment

Conduit Over a year ago

Wow, that is clean. I expected a lot more wizardry to be necessary - thanks! Accepting as soon as the system will let me.

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