This single‐attribute class represents a null value of a given nullable balcl::OptionType. OptionValue uses this type to represent its state where there is a known type, but no value for it. Note that OptionType::e_VOID is not nullable, therefore not supported here. Note that: There is no swap member or namespace‐level function declared (and defined) for this class on purpose, the general swap works fast for such a simple type.

Synopsis

Declared in <balcl_optionvalue.h>

class OptionValue_NullOf;

Member Functions

Name

Description

OptionValue_NullOf [constructor]

Create an OptionValue_NullOf object with the specified nullable optionType. The behavior is undefined if optionType == OptionType::e_VOID.

isType

Return true if TYPE corresponds to the type attribute, and false if it does not.

print

Format this object to the specified output stream at the (absolute value of) the optionally specified indentation level and return a reference to stream. If level is specified, optionally specify spacesPerLevel, the number of spaces per indentation level for this and all of its nested objects. If level is negative, suppress indentation of the first line. If spacesPerLevel is negative, format the entire output on one line, suppressing all but the initial indentation (as governed by level). If stream is not valid on entry, this operation has no effect.

type

Return the option type of this object.

operator BloombergLP::bslmf::NestedTraitDeclaration<OptionValue_NullOf, HasPrintMethod>

Nested trait declaration for bslmf::IsBitwiseMoveable.

Non-Member Functions

Name

Description

operator!=

Return true if the type of the specified lhs and rhs are not equal, and return false if they are not equal. Two OptionValue_NullOf objects are equal when their type attributes are note equal.

operator==

Return true if the type of the specified lhs and rhs are equal, and return false if they are not equal. Two OptionValue_NullOf objects are equal when their type attributes are equal.

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