bsl::variant::variant

Create a variant object holding a copy of original's alternative using allocator.

Synopsis

Declared in <bslstl_variant.h>

template<class t_FIRST = t_HEAD>
requires BloombergLP::bslstl::
                Variant_IsCopyConstructibleAll<t_FIRST, t_TAIL...>::value
variant(
    std::allocator_arg_t allocatorArg,
    allocator_type allocator,
    variant const& original);

Description

Create a variant object holding the same alternative (if any) as the specified original object. If this variant is allocator‐aware, the specified allocator is used to supply memory. If the original object is not valueless by exception`, the contained value is copy‐constructed from the contained value of original. This constructor is deleted unless all alternatives are copy constructible.

Parameters

Name

Description

allocatorArg

tag selecting the allocator‐extended overload

allocator

allocator used to supply memory

original

variant to copy

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