BloombergLP::bdlb::VariantImp::apply

Apply the specified visitor to this variant by passing the value (of template parameter TYPE) this variant currently holds to the visitor object's operator(), and return the value (of template parameter RET_TYPE) returned by the visitor. If this variant is unset, the specified defaultValue of template parameter TYPE is passed to the visitor. TYPE must be the same as one of the types that this variant can hold. The behavior is undefined unless this variant is unset or holds a value of template parameter TYPE.

Synopsis

Declared in <bdlb_variant.h>

template<
    class RET_TYPE,
    class VISITOR,
    class TYPE>
RET_TYPE
apply(
    VISITOR const& visitor,
    TYPE const& defaultValue) const;

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