[#bsl-make_optional-0c]
= xref:bsl.adoc[bsl]::make_optional
:relfileprefix: ../
:mrdocs:

`make_optional` overloads

== Synopses

Declared in `<bslstl_optional.h>`

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


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class t_TYPE>
constexpr
xref:bsl/optional-072.adoc[bsl::optional<t_TYPE>]
xref:bsl/make_optional-01.adoc[make_optional]();
----

[.small]#xref:bsl/make_optional-01.adoc[_» more..._]#

Return an `optional` containing a value constructed from the arguments.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class t_TYPE>
constexpr
xref:bsl/optional-072.adoc[bsl::optional<bsl::decay<t_TYPE>::type>]
xref:bsl/make_optional-0a.adoc[make_optional](t_TYPE&& rhs);
----

[.small]#xref:bsl/make_optional-0a.adoc[_» more..._]#

Return an `optional` containing a value constructed from the arguments.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class t_TYPE,
    class t_INIT_LIST_TYPE,
    class... t_ARGS>
constexpr
xref:bsl/optional-072.adoc[bsl::optional<t_TYPE>]
xref:bsl/make_optional-03.adoc[make_optional](
    std::initializer_list<t_INIT_LIST_TYPE> il,
    t_ARGS&&... args);
----

[.small]#xref:bsl/make_optional-03.adoc[_» more..._]#

Return an `optional` containing a value constructed from the arguments.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class t_TYPE,
    class t_ARG,
    class... t_ARGS>
constexpr
xref:bsl/optional-072.adoc[optional<t_TYPE>]
xref:bsl/make_optional-00.adoc[make_optional](
    t_ARG&& arg,
    t_ARGS&&... args);
----

[.small]#xref:bsl/make_optional-00.adoc[_» more..._]#

Return an `optional` containing a value constructed from the arguments.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class t_TYPE>
xref:bsl/optional-072.adoc[bsl::optional<bsl::decay<t_TYPE>::type>]
xref:bsl/make_optional-04.adoc[make_optional](
    std::allocator_arg_t allocatorArg,
    bsl::optional<bsl::decay<t_TYPE>::type>::allocator_type const& alloc,
    t_TYPE&& rhs);
----

[.small]#xref:bsl/make_optional-04.adoc[_» more..._]#

Return an `optional` containing a value constructed from the arguments.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class t_TYPE,
    class... t_ARGS>
xref:bsl/optional-072.adoc[bsl::optional<t_TYPE>]
xref:bsl/make_optional-0e.adoc[make_optional](
    std::allocator_arg_t allocatorArg,
    bsl::optional<t_TYPE>::allocator_type const& alloc,
    t_ARGS&&... args);
----

[.small]#xref:bsl/make_optional-0e.adoc[_» more..._]#

Return an `optional` containing a value constructed from the arguments.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class t_TYPE,
    class t_INIT_LIST_TYPE,
    class... t_ARGS>
xref:bsl/optional-072.adoc[bsl::optional<t_TYPE>]
xref:bsl/make_optional-06.adoc[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);
----

[.small]#xref:bsl/make_optional-06.adoc[_» more..._]#

== 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

[cols="1,4"]
|===
| 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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