bsl::conditional

This struct template implements the conditional meta-function defined in the C++ standard [meta.trans.other], providing an alias, type, that returns the result. If the (template parameter) value t_COND is true, then type has the same type as the (template parameter) type t_TRUE_TYPE; otherwise, type has the same type as the (template parameter) type t_FALSE_TYPE. Note that this generic default template defines type to be an alias to t_TRUE_TYPE for when t_COND is true. A template specialization is provided (below) handles the case for when t_COND is false.

Synopsis

Declared in <bslmf_conditional.h>

template<
    bool t_COND,
    class t_TRUE_TYPE,
    class t_FALSE_TYPE>
struct conditional;

Type Aliases

Name	Description
`type`	This `typedef` is an alias to the (template parameter) type `t_TRUE_TYPE`.

Specializations

Name	Description
`conditional<false, PackedIntArrayImp<PackedIntArrayImp_Unsigned>, PackedIntArrayImp<PackedIntArrayImp_Signed>>`	This partial specialization of `bsl::conditional`, for when the (template parameter) value `t_COND` is `false`, provides a `typedef` `type` that is an alias to the (template parameter) type `t_FALSE_TYPE`.
`conditional<false, t_TRUE_TYPE, t_FALSE_TYPE>`	This partial specialization of `bsl::conditional`, for when the (template parameter) value `t_COND` is `false`, provides a `typedef` `type` that is an alias to the (template parameter) type `t_FALSE_TYPE`.

Derived Classes

Name Description

ManagedPtr_FactoryDeleterType This metafunction class-template provides a means to compute the preferred deleter function for a factory class for those methods of ManagedPtr that supply only a factory, and no additional deleter function. The intent is to use a common deleter function for all allocators that implement the bslma::Allocator protocol, rather than create a special deleter function based on the complete type of each allocator, each doing the same thing (invoking the virtual function deleteObject).

Name	Description
`ManagedPtr_FactoryDeleterType`	This metafunction class-template provides a means to compute the preferred deleter function for a factory class for those methods of `ManagedPtr` that supply only a factory, and no additional deleter function. The intent is to use a common deleter function for all allocators that implement the `bslma::Allocator` protocol, rather than create a special deleter function based on the complete type of each allocator, each doing the same thing (invoking the virtual function `deleteObject`).