Component-private buffer managing an optional's contained value.
Declared in <bslstl_optional.h>
template<class t_TYPE>
struct Optional_DataImp;This component-private struct manages a value_type object in an Optional_Base object. This class provides an abstraction for const value type. An Optional_Base object may contain an object of const type. An assignment to such an Optional_Base object should not succeed. However, unless the Optional_Base object itself is const, it should be possible to change the value of the Optional_Base object using emplace. In order to allow for that, this class manages a non-const object of value_type, but all the accessors return a const adjusted reference to the managed object.
| Name | Description |
|---|---|
Optional_DataImp [constructor] | Constructors |
emplace | Destroy any contained value and construct a new one in place. |
hasValue | Return true if this objects has a value, and false otherwise. |
reset | Destroy the value_type object in d_buffer, if any. |
value | value overloads |
| Name | Description |
|---|---|
Optional_Data<t_TYPE, true> | Partial specialization for a trivially destructible contained value. |
Optional_Data | Component-private storage that destroys a non-trivial contained value. |