[#BloombergLP-bdlb-NullableValue-2constructor-093]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlb.adoc[bdlb]::xref:BloombergLP/bdlb/NullableValue.adoc[NullableValue]::NullableValue
:relfileprefix: ../../../
:mrdocs:

Constructors

== Synopses

Declared in `<bdlb_nullablevalue.h>`

Create a nullable object having the null value. If `TYPE` takes an optional allocator at construction, use the currently installed default allocator to supply memory.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:BloombergLP/bdlb/NullableValue/2constructor-060.adoc[NullableValue]() noexcept;
----

[.small]#xref:BloombergLP/bdlb/NullableValue/2constructor-060.adoc[_» more..._]#

Create a nullable object having the value of the specified `original` object. If `TYPE` takes an optional allocator at construction, use the currently installed default allocator to supply memory.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:BloombergLP/bdlb/NullableValue/2constructor-0cd.adoc[NullableValue](xref:BloombergLP/bdlb/NullableValue.adoc[NullableValue] const& original);
----

[.small]#xref:BloombergLP/bdlb/NullableValue/2constructor-0cd.adoc[_» more..._]#

Create a nullable object having the null value if the specified `original` object is null, and the value of `original.value()` (of `BDE_OTHER_TYPE`) converted to `TYPE` otherwise. If `TYPE` takes an optional allocator at construction, use the currently installed default allocator to supply memory. Note that this method will fail to compile if `TYPE` and `BDE_OTHER_TYPE' are not compatible.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class BDE_OTHER_TYPE>
explicit
xref:BloombergLP/bdlb/NullableValue/2constructor-0b0.adoc[NullableValue](xref:BloombergLP/bdlb/NullableValue.adoc[NullableValue<BDE_OTHER_TYPE>] const& original);
----

[.small]#xref:BloombergLP/bdlb/NullableValue/2constructor-0b0.adoc[_» more..._]#

Create a nullable object having the same value as the specified `original` object by moving the contents of `original` to the newly‐created object. If `TYPE` takes an optional allocator at construction, the allocator associated with `original` is propagated for use in the newly‐created object. `original` is left in a valid but unspecified state.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:BloombergLP/bdlb/NullableValue/2constructor-07b.adoc[NullableValue](xref:BloombergLP/bslmf/MovableRef.adoc[bslmf::MovableRef<NullableValue>] original) noexcept(/* see-below */);
----

[.small]#xref:BloombergLP/bdlb/NullableValue/2constructor-07b.adoc[_» more..._]#

Create a nullable object that has the null value and that uses the specified `allocator` (e.g., the address of a `bslma::Allocator` object) to supply memory. Note that this constructor will not participate in overload resolution unless `TYPE` is allocator aware.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
explicit
xref:BloombergLP/bdlb/NullableValue/2constructor-0ca.adoc[NullableValue](xref:BloombergLP/bdlb/NullableValue/allocator_type.adoc[allocator_type] const& allocator) noexcept;
----

[.small]#xref:BloombergLP/bdlb/NullableValue/2constructor-0ca.adoc[_» more..._]#

Create a nullable object having the null value. If `TYPE` takes an optional allocator at construction, use the currently installed default allocator to supply memory for subsequent values assigned to this object.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:BloombergLP/bdlb/NullableValue/2constructor-069.adoc[NullableValue](xref:bsl/nullopt_t.adoc[bsl::nullopt_t] const&) noexcept;
----

[.small]#xref:BloombergLP/bdlb/NullableValue/2constructor-069.adoc[_» more..._]#

Create a nullable object having the same value as the specified `original` object but using the specified `allocator` (e.g., the address of a `bslma::Allocator` object) to supply memory. The contents of `original` are moved to the newly‐created object using the extended move constructor for `TYPE`. `original` is left in a valid but unspecified state. Note that this constructor will not participate in overload resolution unless `TYPE` is allocator aware.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:BloombergLP/bdlb/NullableValue/2constructor-0cb.adoc[NullableValue](
    xref:BloombergLP/bslmf/MovableRef.adoc[bslmf::MovableRef<NullableValue>] original,
    xref:BloombergLP/bdlb/NullableValue/allocator_type.adoc[allocator_type] const& allocator);
----

[.small]#xref:BloombergLP/bdlb/NullableValue/2constructor-0cb.adoc[_» more..._]#

Create a nullable object that has the value of the specified `original` object and uses the specified `allocator` (e.g., the address of a `bslma::Allocator` object) to supply memory. Note that this constructor will not participate in overload resolution unless `TYPE` is allocator aware.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:BloombergLP/bdlb/NullableValue/2constructor-042.adoc[NullableValue](
    xref:BloombergLP/bdlb/NullableValue.adoc[NullableValue] const& original,
    xref:BloombergLP/bdlb/NullableValue/allocator_type.adoc[allocator_type] const& allocator);
----

[.small]#xref:BloombergLP/bdlb/NullableValue/2constructor-042.adoc[_» more..._]#

Create a nullable object that has the null value; use the specified `allocator` (e.g., the address of a `bslma::Allocator` object) to supply memory for subsequent values assigned to this object. Note that this constructor will not participate in overload resolution unless `TYPE` is allocator aware.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:BloombergLP/bdlb/NullableValue/2constructor-099.adoc[NullableValue](
    xref:bsl/nullopt_t.adoc[bsl::nullopt_t] const&,
    xref:BloombergLP/bdlb/NullableValue/allocator_type.adoc[allocator_type] const& allocator) noexcept;
----

[.small]#xref:BloombergLP/bdlb/NullableValue/2constructor-099.adoc[_» more..._]#

Create a nullable object having the same value as the specified `value` (of `NullableValue<BDE_OTHER_TYPE>`) converted to `TYPE`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class BDE_OTHER_TYPE>
xref:BloombergLP/bdlb/NullableValue/2constructor-05a.adoc[NullableValue](
    xref:BloombergLP/bslmf/MovableRef_Deduced.adoc[BloombergLP::bslmf::MovableRef_Deduced<NullableValue<BDE_OTHER_TYPE>>] value,
    xref:BloombergLP/bdlb/NullableValue.adoc[EnableType] = EnableType())
requires bsl::is_convertible<BDE_OTHER_TYPE, TYPE>::value &&
                     !bsl::is_same<bsl::optional<BDE_OTHER_TYPE>, TYPE>::value;
----

[.small]#xref:BloombergLP/bdlb/NullableValue/2constructor-05a.adoc[_» more..._]#

Create a nullable object from the specified optional `value`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class BDE_OTHER_TYPE>
xref:BloombergLP/bdlb/NullableValue/2constructor-0fd2.adoc[NullableValue](
    xref:BloombergLP/bslmf/MovableRef_Deduced.adoc[BloombergLP::bslmf::MovableRef_Deduced<bsl::optional<BDE_OTHER_TYPE>>] value,
    xref:BloombergLP/bdlb/NullableValue.adoc[EnableType] = EnableType())
requires bsl::is_convertible<BDE_OTHER_TYPE, TYPE>::value &&
                     !bsl::is_same<bsl::optional<BDE_OTHER_TYPE>, TYPE>::value;
----

[.small]#xref:BloombergLP/bdlb/NullableValue/2constructor-0fd2.adoc[_» more..._]#

Create a nullable object that has the null value if the specified `original` object is null, and the value of `original.value()` (of `BDE_OTHER_TYPE`) converted to `TYPE` otherwise. Use the specified `allocator` (e.g., the address of a `bslma::Allocator` object) to supply memory. Note that this constructor will not participate in overload resolution unless `TYPE` is allocator aware. Also note that compilation will fail if this function is called with a `BDE_OTHER_TYPE` that is not convertible to `TYPE`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class BDE_OTHER_TYPE>
xref:BloombergLP/bdlb/NullableValue/2constructor-0bf.adoc[NullableValue](
    xref:BloombergLP/bdlb/NullableValue.adoc[NullableValue<BDE_OTHER_TYPE>] const& original,
    xref:BloombergLP/bdlb/NullableValue/allocator_type.adoc[allocator_type] const& allocator);
----

[.small]#xref:BloombergLP/bdlb/NullableValue/2constructor-0bf.adoc[_» more..._]#

Create a nullable object from the specified optional `value`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class BDE_OTHER_TYPE>
xref:BloombergLP/bdlb/NullableValue/2constructor-041.adoc[NullableValue](
    xref:bsl/optional-072.adoc[bsl::optional<BDE_OTHER_TYPE>] const& value,
    xref:BloombergLP/bdlb/NullableValue.adoc[EnableType] = EnableType())
requires bsl::is_convertible<BDE_OTHER_TYPE, TYPE>::value &&
                     !bsl::is_same<bsl::optional<BDE_OTHER_TYPE>, TYPE>::value;
----

[.small]#xref:BloombergLP/bdlb/NullableValue/2constructor-041.adoc[_» more..._]#

Create a nullable object having the specified `value` (of `BDE_OTHER_TYPE`) converted to `TYPE`. If `TYPE` takes an optional allocator at construction, use the currently installed default allocator to supply memory. Note that this constructor will not participate in overload resolution unless `BDE_OTHER_TYPE` is convertible to `TYPE` and is not convertible to `allocator_type`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class BDE_OTHER_TYPE>
xref:BloombergLP/bdlb/NullableValue/2constructor-0fd4.adoc[NullableValue](
    BDE_OTHER_TYPE&& value,
    xref:BloombergLP/bdlb/NullableValue.adoc[EnableType] = EnableType())
requires bsl::is_convertible<BDE_OTHER_TYPE, TYPE>::value &&
                      !bsl::is_convertible<BDE_OTHER_TYPE,
                                           allocator_type>::value;
----

[.small]#xref:BloombergLP/bdlb/NullableValue/2constructor-0fd4.adoc[_» more..._]#

Create a nullable object having the same value as the specified `value` (of `NullableValue<BDE_OTHER_TYPE>`) converted to `TYPE`, using the specified `allocator` to supply memory.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class BDE_OTHER_TYPE>
xref:BloombergLP/bdlb/NullableValue/2constructor-051.adoc[NullableValue](
    xref:BloombergLP/bslmf/MovableRef_Deduced.adoc[BloombergLP::bslmf::MovableRef_Deduced<NullableValue<BDE_OTHER_TYPE>>] value,
    xref:BloombergLP/bdlb/NullableValue/allocator_type.adoc[allocator_type] const& allocator,
    xref:BloombergLP/bdlb/NullableValue.adoc[EnableType] = EnableType())
requires bsl::is_convertible<BDE_OTHER_TYPE, TYPE>::value &&
                     !bsl::is_same<bsl::optional<BDE_OTHER_TYPE>, TYPE>::value;
----

[.small]#xref:BloombergLP/bdlb/NullableValue/2constructor-051.adoc[_» more..._]#

Create a nullable object from the specified `value` using the specified `allocator`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class BDE_OTHER_TYPE>
xref:BloombergLP/bdlb/NullableValue/2constructor-0c4.adoc[NullableValue](
    xref:BloombergLP/bslmf/MovableRef_Deduced.adoc[BloombergLP::bslmf::MovableRef_Deduced<bsl::optional<BDE_OTHER_TYPE>>] value,
    xref:BloombergLP/bdlb/NullableValue/allocator_type.adoc[allocator_type] const& allocator,
    xref:BloombergLP/bdlb/NullableValue.adoc[EnableType] = EnableType())
requires bsl::is_convertible<BDE_OTHER_TYPE, TYPE>::value &&
                     !bsl::is_same<bsl::optional<BDE_OTHER_TYPE>, TYPE>::value;
----

[.small]#xref:BloombergLP/bdlb/NullableValue/2constructor-0c4.adoc[_» more..._]#

Create a nullable object having the value of the specified `value` (of `BDE_OTHER_TYPE`) converted to `TYPE` and that uses the specified `allocator` to supply memory.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class BDE_OTHER_TYPE>
xref:BloombergLP/bdlb/NullableValue/2constructor-0a.adoc[NullableValue](
    xref:bsl/optional-072.adoc[bsl::optional<BDE_OTHER_TYPE>] const& value,
    xref:BloombergLP/bdlb/NullableValue/allocator_type.adoc[allocator_type] const& allocator,
    xref:BloombergLP/bdlb/NullableValue.adoc[EnableType] = EnableType())
requires bsl::is_convertible<BDE_OTHER_TYPE, TYPE>::value &&
                     !bsl::is_same<bsl::optional<BDE_OTHER_TYPE>, TYPE>::value;
----

[.small]#xref:BloombergLP/bdlb/NullableValue/2constructor-0a.adoc[_» more..._]#

Create a nullable object that has the specified `value` (of `BDE_OTHER_TYPE`) converted to `TYPE` and that uses the specified `allocator` (e.g., the address of a `bslma::Allocator` object) to supply memory. Note that this constructor will not participate in overload resolution unless `TYPE` is allocator aware and `BDE_OTHER_TYPE` is convertible to `TYPE`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class BDE_OTHER_TYPE>
xref:BloombergLP/bdlb/NullableValue/2constructor-070.adoc[NullableValue](
    BDE_OTHER_TYPE&& value,
    xref:BloombergLP/bdlb/NullableValue/allocator_type.adoc[allocator_type] const& allocator,
    xref:BloombergLP/bdlb/NullableValue.adoc[EnableType] = EnableType())
requires bsl::is_convertible<BDE_OTHER_TYPE, TYPE>::value;
----

[.small]#xref:BloombergLP/bdlb/NullableValue/2constructor-070.adoc[_» more..._]#


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