[#absl-AnyInvocable-2constructor-01]
= xref:absl.adoc[absl]::xref:absl/AnyInvocable.adoc[AnyInvocable]::AnyInvocable
:relfileprefix: ../../
:mrdocs:

Constructors

== Synopses

Declared in `<absl/functional/any_invocable.h>`

Constructs the `AnyInvocable` in an empty state. Invoking it results in undefined behavior.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:absl/AnyInvocable/2constructor-03.adoc[AnyInvocable]() noexcept = default;
----

[.small]#xref:absl/AnyInvocable/2constructor-03.adoc[_» more..._]#

Constructs the `AnyInvocable` from an existing `AnyInvocable` by a move. Note that `f` is not guaranteed to be empty after move‐construction, although it may be.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:absl/AnyInvocable/2constructor-0c.adoc[AnyInvocable](xref:absl/AnyInvocable.adoc[AnyInvocable]&& f) noexcept = default;
----

[.small]#xref:absl/AnyInvocable/2constructor-0c.adoc[_» more..._]#

Constructs the `AnyInvocable` in an empty state from a null pointer.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:absl/AnyInvocable/2constructor-04.adoc[AnyInvocable](std::nullptr_t unused) noexcept;
----

[.small]#xref:absl/AnyInvocable/2constructor-04.adoc[_» more..._]#

Constructs an `AnyInvocable` from an invocable object.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class F>
requires internal_any_invocable::CanConvert<Sig, F>::value
xref:absl/AnyInvocable/2constructor-00.adoc[AnyInvocable](F&& f);
----

[.small]#xref:absl/AnyInvocable/2constructor-00.adoc[_» more..._]#

Constructs an `AnyInvocable` that holds an invocable object of type `T`, which is constructed in‐place from the given arguments.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class T,
    class... Args>
requires internal_any_invocable::CanEmplace<Sig, T, Args...>::value
explicit
xref:absl/AnyInvocable/2constructor-02.adoc[AnyInvocable](
    std::in_place_type_t<T> tag,
    Args&&... args);
----

[.small]#xref:absl/AnyInvocable/2constructor-02.adoc[_» more..._]#

Overload of the above constructor to support list‐initialization.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class T,
    class U,
    class... Args>
requires internal_any_invocable::CanEmplace<
                Sig, T, std::initializer_list<U>&, Args...>::value
explicit
xref:absl/AnyInvocable/2constructor-0f.adoc[AnyInvocable](
    std::in_place_type_t<T> tag,
    std::initializer_list<U> ilist,
    Args&&... args);
----

[.small]#xref:absl/AnyInvocable/2constructor-0f.adoc[_» more..._]#

== Parameters

[cols="1,4"]
|===
| Name| Description
| *f*
| The `AnyInvocable` to move from.
| *unused*
| Unused parameter.
| *args*
| Arguments forwarded to the constructor of `T`.
| *tag*
| A tag that selects this overload.
| *ilist*
| Initializer list forwarded to the constructor of `T`.
|===


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