BloombergLP::bdlat_EnumFunctions::HasFallbackEnumerator

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.