template <typename TReturn, typename TVisitor, typename TVariant> \
static TReturn visit(TVisitor VISITQUAL visitor, TVariant VARIANTQUAL variant) \
{ \
switch (variant.index()) \
{ \
case 0: return static_cast<TReturn>(visitor(get<0>(variant))); \
case 1: return static_cast<TReturn>(visitor(get<1>(variant))); \
case 2: return static_cast<TReturn>(visitor(get<2>(variant))); \
case 3: return static_cast<TReturn>(visitor(get<3>(variant))); \
case 4: return static_cast<TReturn>(visitor(get<4>(variant))); \
case 5: return static_cast<TReturn>(visitor(get<5>(variant))); \
case 6: return static_cast<TReturn>(visitor(get<6>(variant))); \
case 7: return static_cast<TReturn>(visitor(get<7>(variant))); \
default: ETL_ASSERT_FAIL_AND_RETURN_VALUE(ETL_ERROR(bad_variant_access), TReturn()); \
} \
}