This struct template implements a meta‐function that provides a typedef type that is an alias to the (template parameter) t_TYPE if the (template parameter) t_COND is true; otherwise, type is not provided. If t_TYPE is not specified, it is set to void. Note that this generic default template provides type for when t_COND is true; a template specialization is provided (below) that omits type for when t_COND is false.

Synopsis

Declared in <bslmf_enableif.h>

template<
    bool t_COND,
    class t_TYPE = void>
struct EnableIf;

Description

Also note that although this struct is functionally identical to bsl::enable_if, the use of bsl::enable_if should be preferred.

Type Aliases

Name

Description

type

This typedef is an alias to the (template parameter) t_TYPE.

Specializations

Name

Description

EnableIf<false, t_TYPE>

This partial specialization of EnableIf, for when the (template parameter) t_COND is false, guarantees that no typedef type is supplied. Note that this class definition is intentionally empty.

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