bsl::variant::variant

Create a variant object from a std::variant original using allocator.

Synopsis

Declared in <bslstl_variant.h>

template<class t_STD_VARIANT>
explicit
variant(
    std::allocator_arg_t allocatorArg,
    allocator_type allocator,
    t_STD_VARIANT&& original);

Description

Create a variant object holding the same alternative (if any) held by the specified original. If this variant is allocator‐aware, the specified allocator is used to supply memory. If original is not valueless by exception, the contained value is copy/move‐constructed from the contained value of original. This constructor participates in overload resolution only if all alternatives are copy/move‐constructible.

Parameters

Name

Description

allocatorArg

tag selecting the allocator‐extended overload

allocator

allocator used to supply memory

original

std::variant to construct from

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