This struct should be specialized for third‐party types that need to expose "choice" behavior. See the component‐level documentation for further information.

Synopsis

Declared in <bdlat_choicefunctions.h>

template<class TYPE>
struct IsChoice
    : bsl::integral_constant<bool, bslalg::HasTrait<TYPE, bdlat_TypeTraitBasicChoice>::value>

Base Classes

Name

Description

bsl::integral_constant<bool, bslalg::HasTrait<TYPE, bdlat_TypeTraitBasicChoice>::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

Member Functions

Name

Description

operator()

Return a copy of the template argument t_VALUE.

operator value_type

Static Data Members

Name

value

Specializations

Name

IsChoice<bdlar::ChoiceConstRef>

IsChoice<bdlar::ChoiceRef>

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