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).

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