Variant Namespace Reference

Namespaces
namespace	detail

Functions
template<typename Visitor , typename Variant , typename VariantBase = detail::deduced_variant<Variant &&>>
decltype(auto)	Visit (Visitor &&vis, Variant &&var)
	Mimic some of std::visit, for the case of one visitor only. More...

Function Documentation

Visit()

template<typename Visitor , typename Variant , typename VariantBase = detail::deduced_variant<Variant &&>>

decltype(auto) Variant::Visit	(	Visitor &&	vis,
		Variant &&	var
	)

Mimic some of std::visit, for the case of one visitor only.

This is necessary because of limitations of the macOS implementation of some of the C++17 standard library without a minimum version of 10.13, and so let's use this even when not needed on the other platforms, instead of having too much conditional compilation

Definition at line 138 of file Variant.h.

{
   using ForwardType = std::conditional_t<std::is_lvalue_reference_v<Variant>,
      std::add_lvalue_reference_t<VariantBase>, VariantBase>;
   constexpr auto size = std::variant_size_v<VariantBase>;
   return detail::VisitHelper(std::make_index_sequence<size>{},
      std::forward<Visitor>(vis), detail::forward_variant<ForwardType>(var));
}

References size, and Variant::detail::VisitHelper().

Referenced by Registry::VisitorFunctions< RegistryTraits, Reference >::Visit().

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