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.

Synopsis

Declared in <bslstl_variant.h>

template<
    class t_RET,
    class t_VISITOR,
    class t_VARIANT,
    class t_DUMMY>
struct Variant_VTableId;

Description

The referenced function 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++.

Specializations

Name

Description

Variant_VTableId<t_RET, t_VISITOR, t_VARIANT, bslmf::IntegerSequence<std::size_t, t_INDICES...>>

This partial specialization provides the actual s_mapId array once t_DUMMY is deduced as an IntegerSequence of alternative indices.

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