BloombergLP::bslstl::Optional_Data

Synopsis

Declared in <bslstl_optional.h>

template<
    class t_TYPE,
    bool t_IS_TRIVIALLY_DESTRUCTIBLE = bslstl::Optional_IsTriviallyDestructible<t_TYPE>::value>
struct Optional_Data
    : Optional_DataImp<t_TYPE>

Base Classes

Name Description

Optional_DataImp<t_TYPE> 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<t_TYPE>`	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.

Member Functions

Name	Description
`~Optional_Data` [destructor]	Destroy the managed `value_type` object, if it exists.
`emplace`	`emplace` overloads
`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

Using Declarations

Name
`Unnamed using`

Specializations

Name	Description
`Optional_Data<t_TYPE, true>`	This partial specialization manages a trivially destructible `value_type` in Optional_Base. It does not have a user-provided destructor, which makes it `is_trivially_destructible` itself.