[#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. If `t_TYPE` uses an allocator, the default allocator will be used for the `optional` object. This function can be called in constant expressions only if `t_TYPE` is not allocator‐aware.


[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` object containing a `t_TYPE` object created by invoking a `bsl::optional` constructor with the specified `rhs` as the constructor argument. If `t_TYPE` uses an allocator, the default allocator will be used for the `optional` object. This function can be called in constant expressions only if `t_TYPE` is not allocator‐aware.


[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` object containing a `t_TYPE` object created by invoking a `bsl::optional` `in_place_t` constructor with the specified `il` and `args` as the constructor arguments. If `t_TYPE` uses an allocator, the default allocator will be used for the `optional` object. This function can be called in constant expressions only if `t_TYPE` is not allocator‐aware.


[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` object containing a `TYPE` object created by invoking a `bsl::optional` `in_place_t` constructor with the specified `arg` and `args` as the constructor arguments. If `t_TYPE` uses an allocator, the default allocator will be used for the `optional` object. This function can be called in constant expressions only if `t_TYPE` is not allocator‐aware.


[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` object containing a `t_TYPE` object created by invoking a `bsl::optional` allocator‐extended `in_place_t` constructor with the specified `alloc` as the allocator argument, and specified `rhs` as the constructor argument. Note that this function will fail to compile if `t_TYPE` doesn't use allocators.


[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,
    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` object containing a `t_TYPE` object created by invoking a `bsl::optional` allocator‐extended `in_place_t` constructor with the specified `alloc` as the allocator argument, and specified `args` as constructor arguments. Note that this function will fail to compile if `t_TYPE` doesn't use allocators.


[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,
    bsl::optional<t_TYPE>::allocator_type const& alloc,
    t_ARGS&&... args);
----

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

Return an `optional` object containing a `t_TYPE` object created by invoking a `bsl::optional` allocator‐extended `in_place_t` constructor with the specified `alloc` as the allocator argument, and specified `il` and `args` as the constructor arguments. Note that this function will fail to compile if `t_TYPE` doesn't use allocators.


[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,
    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..._]#


[.small]#Created with https://www.mrdocs.com[MrDocs]#