Apply visitor to the held value of this modifiable variant.

Synopsis

Declared in <bdlb_variant.h>

template<class VISITOR>
VISITOR::ResultType
apply(VISITOR const& visitor)
requires Variant_ReturnValueHelper<VISITOR>::value == 1;

Description

If If this variant is unset, a default constructed bslmf::Nil is passed to the visitor. 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.

Return Value

result of invoking visitor on the active alternative

Parameters

Name

Description

visitor

callable applied to the active alternative

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