[#BloombergLP-bslmf-NestedTraitDeclaration]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslmf.adoc[bslmf]::NestedTraitDeclaration
:relfileprefix: ../../
:mrdocs:

Class `t_TYPE` will be convertible to `NestedTraitDeclaration<t_TYPE,t_TRAIT,true>` if `t_TRAIT` is associated with `t_TYPE` using the `BSLMF_NESTED_TRAIT_DECLARATION` macro. Nested trait detection depends on `t_COND` being true. If `t_COND` is false, the nested trait detection will not see the conversion it is looking for and will not associate `t_TRAIT` with `t_TYPE`. This feature is used by `BSLMF_NESTED_TRAIT_DECLARATION_IF` to turn a trait on or off depending on a compile‐time condition (usually another trait).

== Synopsis

Declared in `<bslmf_nestedtraitdeclaration.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class t_TYPE,
    template<class t_T> typename t_TRAIT,
    bool t_COND = true>
class NestedTraitDeclaration;
----

== Type Aliases

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslmf/NestedTraitDeclaration/Type.adoc[`Type`] 
| This `typedef` is an alias to `NestedTraitDeclaration`.
|===


== Derived Classes

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslalg/TypeTraitHasTrivialDefaultConstructor/NestedTraitDeclaration.adoc[`NestedTraitDeclaration`] 
| This class template ties the `bslalg::TypeTraitHasTrivialDefaultConstructor` trait tag to the `bsl::is_trivially_default_constructible` trait metafunction.
| xref:BloombergLP/bdlb/TypeTraitHasPrintMethod/NestedTraitDeclaration.adoc[`NestedTraitDeclaration`] 
| This class template ties the `bdlb::TypeTraitHasPrintMethod` trait tag to the `bdlb::HasPrintMethod` trait metafunction.
| xref:BloombergLP/bslalg/TypeTraitBitwiseEqualityComparable/NestedTraitDeclaration.adoc[`NestedTraitDeclaration`] 
| This class template ties the `bslalg::TypeTraitBitwiseEqualityComparable` trait tag to the `bslmf::IsBitwiseEqualityComparable` trait metafunction.
| xref:BloombergLP/bdlat_TypeTraitBasicEnumeration/NestedTraitDeclaration.adoc[`NestedTraitDeclaration`] 
| This class template ties the `bdlat_TypeTraitBasicEnumeration` trait tag to the `bdlat_IsBasicEnumeration` trait metafunction.
| xref:BloombergLP/bslalg/TypeTraitBitwiseMoveable/NestedTraitDeclaration.adoc[`NestedTraitDeclaration`] 
| This class template ties the `bslalg::TypeTraitBitwiseMoveable` trait tag to the `bslmf::IsBitwiseMoveable` trait metafunction.
| xref:BloombergLP/bslalg/TypeTraitUsesBslmaAllocator/NestedTraitDeclaration.adoc[`NestedTraitDeclaration`] 
| This class template ties the `bslalg::TypeTraitUsesBslmaAllocator` trait tag to the `bslma::UsesBslmaAllocator` trait metafunction.
| xref:BloombergLP/bslalg/TypeTraitPair/NestedTraitDeclaration.adoc[`NestedTraitDeclaration`] 
| This class template ties the `bslalg::TypeTraitPair` trait tag to the `bslmf::IsPair` trait metafunction.
| xref:BloombergLP/bslalg/TypeTraitBitwiseCopyable/NestedTraitDeclaration.adoc[`NestedTraitDeclaration`] 
| This class template ties the `bslalg::TypeTraitBitwiseCopyable` trait tag to the `bsl::is_trivially_copyable` trait metafunction.
| xref:BloombergLP/bdlat_TypeTraitHasFallbackEnumerator/NestedTraitDeclaration.adoc[`NestedTraitDeclaration`] 
| This class template ties the `bdlat_TypeTraitHasFallbackEnumerator` trait tag to the `bdlat_HasFallbackEnumerator` trait metafunction.
| xref:BloombergLP/bslalg/TypeTraitHasPointerSemantics/NestedTraitDeclaration.adoc[`NestedTraitDeclaration`] 
| This class template ties the `bslalg::TypeTraitHasPointerSemantics` trait tag to the `bslmf::HasPointerSemantics` trait metafunction.
| xref:BloombergLP/bdlat_TypeTraitBasicSequence/NestedTraitDeclaration.adoc[`NestedTraitDeclaration`] 
| This class template ties the `bdlat_TypeTraitBasicSequence` trait tag to the `bdlat_IsBasicSequence` trait metafunction.
| xref:BloombergLP/bdlat_TypeTraitBasicCustomizedType/NestedTraitDeclaration.adoc[`NestedTraitDeclaration`] 
| This class template ties the `bdlat_TypeTraitBasicCustomizedType` trait tag to the `bdlat_IsBasicCustomizedType` trait metafunction.
| xref:BloombergLP/bdlat_TypeTraitBasicChoice/NestedTraitDeclaration.adoc[`NestedTraitDeclaration`] 
| This class template ties the `bdlat_TypeTraitBasicChoice` trait tag to the `bdlat_IsBasicChoice` trait metafunction.
| xref:BloombergLP/bslalg/TypeTraitHasStlIterators/NestedTraitDeclaration.adoc[`NestedTraitDeclaration`] 
| This class template ties the `bslalg::TypeTraitHasStlIterators` trait tag to the `bslmf::HasStlIterators` trait metafunction.
|===


[.small]#Created with https://www.mrdocs.com[MrDocs]#