bdlb_nullopt

Detailed Description

Outline

• Purpose
• Classes
• Description

Purpose

Provide a tag type and constant indicating an empty nullable value.

Deprecated:

use bsl::nullopt_t from bsl_optional.h instead.

Classes

• NullOptType: tag type representing an empty nullable value
• nullOpt: literal value of type NullOptType

See also

bsl::optional

Description

This component provides a class, bdlb::NullOptType, that is a synonym for bsl::nullopt_t.

In addition to the NullOptType class type, this component defines a constant, bdlb::nullOpt, of type NullOptType, which is a synonym for bsl::nullopt.

Please use bsl::nullopt_t and bsl::nullopt instead of bdlb::NullOptType and bdlb::nullOpt, respectively.