This component-private struct computes an array in which element i is a pointer to Variant_FunctionId<t_RET, t_VISITOR, t_VARIANT, i>::functionImpl, defined above as a function that invokes a t_VISITOR with a tag representing i and alternative i of t_VARIANT, implicitly converting the return type to t_RET. Implementation note: The constexpr static maps of pointers defined by Variant_VTable and this class have deliberately been defined in two different classes as having them in the same class caused issues with Clang and Microsoft Visual C++.
Declared in <bslstl_variant.h>
template<
class t_RET,
class t_VISITOR,
class t_VARIANT,
class t_DUMMY>
struct Variant_VTableId;| Name | Description |
|---|---|
Variant_VTableId<t_RET, t_VISITOR, t_VARIANT, bslmf::IntegerSequence<std::size_t, t_INDICES...>> | In order to allow for perfect forwarding, both t_VISITOR and t_VARIANT must be of reference type. If they are not, something went wrong. |