Constructors

Synopses

Declared in <bslstl_variant.h>

Create a Variant_Base object holding the 0th alternative, which is value‐initialized. If this Variant_Base is allocator‐aware, the currently installed default allocator is used to supply memory.

Variant_Base();

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Create a Variant_Base object holding the same alternative (if any) as the specified original object. If this Variant_Base is allocator‐aware, the currently installed default 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. All alternatives shall be copy constructible.

Variant_Base(Variant_Base const& original);

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Create a Variant_Base object holding the same alternative (if any) held by the specified original. If this Variant_Base is allocator‐aware, the allocator of original is used to supply memory. If the original object is not valueless by exception, the contained value is move‐constructed from the contained value of original. All alternatives shall be move constructible.

Variant_Base(Variant_Base&& original);

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Create a Variant_Base object whose index is the specified index without constructing an alternative object. If this Variant_Base is allocator‐aware, the default allocator is used to supply memory.

Variant_Base(
    Variant_ConstructFromStdTag,
    size_t index);

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Create a Variant_Base object holding the 0th alternative, which is value‐initialized. If this Variant_Base is allocator‐aware, the specified allocator is used to supply memory.

Variant_Base(
    std::allocator_arg_t,
    allocator_type allocator);

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Create a Variant_Base object holding the alternative with index (template parameter) t_INDEX, direct‐initialized from the specified args. If this Variant_Base is allocator‐aware, the currently installed default allocator is used to supply memory.

template<
    size_t t_INDEX,
    class... t_ARGS>
explicit
Variant_Base(
    bsl::in_place_index_t<t_INDEX>,
    t_ARGS&&... args);

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Create a Variant_Base object holding the same alternative (if any) held by the specified original object. If this Variant_Base 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/move constructed from the contained value of original. All alternatives shall be copy/move constructible.

Variant_Base(
    std::allocator_arg_t,
    allocator_type allocator,
    Variant const& original);

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See the corresponding copy constructor above.

Variant_Base(
    std::allocator_arg_t,
    allocator_type allocator,
    Variant&& original);

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Create a Variant_Base object whose index is the specified index without constructing an alternative object. If this Variant_Base is allocator‐aware, the specified allocator is used to supply memory.

Variant_Base(
    std::allocator_arg_t,
    allocator_type allocator,
    Variant_ConstructFromStdTag,
    size_t index);

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Create a Variant_Base object holding the alternative with index (template parameter) t_INDEX, direct‐initialized from the specified args. If this Variant_Base is allocator‐aware, the specified allocator is used to supply memory.

template<
    size_t t_INDEX,
    class... t_ARGS>
explicit
Variant_Base(
    std::allocator_arg_t,
    allocator_type allocator,
    bsl::in_place_index_t<t_INDEX>,
    t_ARGS&&... args);

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