​

template isInt(alias var)

{

    pragma(msg, "instantiated with " ~ (typeof(var)).stringof);

    enum isInt = is(typeof(var) == int);

}

​

void main()

{

    {

        int item;

        static assert(isInt!item);

    }

    {

        long item;

        static assert(!isInt!item);

    }

}