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Unreal Engine C++ API Reference > Runtime > Core > Misc
References
| Module | Core |
| Header | /Engine/Source/Runtime/Core/Public/Misc/Optional.h |
| Include | #include "Misc/Optional.h" |
Syntax
template<typename OptionalType>
struct TOptional
Remarks
When we have an optional value IsSet() returns true, and GetValue() is meaningful. Otherwise GetValue() is not meaningful.
Constructors
| Type | Name | Description | |
|---|---|---|---|
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TOptional () |
Construct an OptionalType with no value; i.e. unset | |
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TOptional
(
const OptionalType& InValue |
Construct an OptionalType with a valid value. | |
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TOptional
(
OptionalType&& InValue |
||
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Construct an OptionalType with an invalid value. | ||
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Copy/Move construction | ||
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Destructors
| Type | Name | Description | |
|---|---|---|---|
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~TOptional () |
Functions
| Type | Name | Description | |
|---|---|---|---|
 |
OptionalType & | Emplace
(
ArgsType&&... Args |
|
  |
const OptionalType & | Get
(
const OptionalType& DefaultValue |
|
 |
OptionalType * | GetPtrOrNull () |
|
  |
const OptionalType * | GetPtrOrNull () |
|
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const OptionalType & | GetValue () |
|
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OptionalType & | GetValue () |
|
  |
bool | IsSet () |
|
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void | Reset () |
|
 |
void |
Operators
| Type | Name | Description | |
|---|---|---|---|
  |
|||
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OptionalType & | operator* () |
|
  |
const OptionalType & | operator* () |
|
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TOptional & | ||
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TOptional & | ||
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TOptional & | operator=
(
const OptionalType& InValue |
|
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TOptional & | operator=
(
OptionalType&& InValue |
|
 |
OptionalType * | operator-> () |
|
  |
const OptionalType * | operator-> () |
Typedefs
| Name | Description |
|---|---|
| ElementType | |
| ValueStorageType |
Constants
| Name | Description |
|---|---|
| bUsingIntrusiveUnsetState |