Meta‐function that detects whether TYPE has a fallback enumerator.

Synopsis

Declared in <bdlat_enumfunctions.h>

template<class TYPE>
struct HasFallbackEnumerator
    : bsl::integral_constant<bool, bslalg::HasTrait<TYPE, bdlat_TypeTraitHasFallbackEnumerator>::value>

Description

This struct should be specialized for third‐party types that need to declare the fact that they have a fallback enumerator value. Clients that specialize this struct must ensure that if HasFallbackEnumerator<TYPE>::value is true, then IsEnumeration<TYPE>::value is also true; otherwise, the behavior is undefined.

Base Classes

Name

Description

bsl::integral_constant<bool, bslalg::HasTrait<TYPE, bdlat_TypeTraitHasFallbackEnumerator>::value>

Metafunction representing a compile‐time constant of the specified (template parameter) t_TYPE with the specified (template parameter) t_VALUE.

Type Aliases

Name

Description

type

Alias for this integral_constant specialization.

value_type

Alias for the (template parameter) t_TYPE.

Member Functions

Name

Description

operator()

Return a copy of the template argument t_VALUE.

operator t_TYPE

Return a copy of the template argument t_VALUE.

Static Data Members

Name

Description

value

The compile‐time constant value of this metafunction.

Specializations

Name

Description

HasFallbackEnumerator<bdlar::EnumConstRef>

Trait indicating that bdlar::EnumConstRef supports a fallback enumerator.

HasFallbackEnumerator<bdlar::EnumRef>

Trait indicating that bdlar::EnumRef supports a fallback enumerator.

Created with MrDocs