make_optional overloads

Synopses

Declared in <bslstl_optional.h>

Return an optional object containing a value‐initialized t_TYPE object.

template<class t_TYPE>
constexpr
bsl::optional<t_TYPE>
make_optional();

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Return an optional containing a value constructed from the arguments.

template<class t_TYPE>
constexpr
bsl::optional<bsl::decay<t_TYPE>::type>
make_optional(t_TYPE&& rhs);

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Return an optional containing a value constructed from the arguments.

template<
    class t_TYPE,
    class t_INIT_LIST_TYPE,
    class... t_ARGS>
constexpr
bsl::optional<t_TYPE>
make_optional(
    std::initializer_list<t_INIT_LIST_TYPE> il,
    t_ARGS&&... args);

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Return an optional containing a value constructed from the arguments.

template<
    class t_TYPE,
    class t_ARG,
    class... t_ARGS>
constexpr
optional<t_TYPE>
make_optional(
    t_ARG&& arg,
    t_ARGS&&... args);

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Return an optional containing a value constructed from the arguments.

template<class t_TYPE>
bsl::optional<bsl::decay<t_TYPE>::type>
make_optional(
    std::allocator_arg_t allocatorArg,
    bsl::optional<bsl::decay<t_TYPE>::type>::allocator_type const& alloc,
    t_TYPE&& rhs);

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Return an optional containing a value constructed from the arguments.

template<
    class t_TYPE,
    class... t_ARGS>
bsl::optional<t_TYPE>
make_optional(
    std::allocator_arg_t allocatorArg,
    bsl::optional<t_TYPE>::allocator_type const& alloc,
    t_ARGS&&... args);

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Return an optional containing a value constructed from the arguments.

template<
    class t_TYPE,
    class t_INIT_LIST_TYPE,
    class... t_ARGS>
bsl::optional<t_TYPE>
make_optional(
    std::allocator_arg_t allocatorArg,
    bsl::optional<t_TYPE>::allocator_type const& alloc,
    std::initializer_list<t_INIT_LIST_TYPE> il,
    t_ARGS&&... args);

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Return Value

  • optional containing a value‐initialized t_TYPE

  • optional containing a t_TYPE constructed from rhs

  • optional containing a t_TYPE constructed from il and args

  • optional containing a t_TYPE constructed from the arguments

  • optional containing a t_TYPE constructed from args

Parameters

Name

Description

rhs

right‐hand operand

il

initializer list forwarded to construct the contained value

args

arguments forwarded to construct the contained value

arg

argument forwarded to construct the contained value

allocatorArg

tag selecting the allocator‐extended constructor

alloc

allocator used to supply memory for the optional

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