Apply the specified visitor to this variant by passing the value this variant currently holds to the visitor object's operator(), and return the value returned by the visitor. The behavior is undefined if this variant is unset. Note that this method is selected only if the template parameter type VISITOR defines a typedef of ResultType in its public interface. Also note that this method is defined inline to work around a Windows compiler bug with SFINAE functions.
Declared in <bdlb_variant.h>
template<class VISITOR>
VISITOR::ResultType
applyRaw(VISITOR const& visitor) const
requires Variant_ReturnValueHelper<VISITOR>::value == 1;