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

Meta&hyphen;function for detecting if one class is an accessible base of another&period;

== Synopsis

Declared in `&lt;bslmf&lowbar;isaccessiblebaseof&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template&lt;
    class t&lowbar;BASE,
    class t&lowbar;DERIVED&gt;
class IsAccessibleBaseOf
    : public xref:bsl/integral_constant-02.adoc[bsl::integral&lowbar;constant&lt;bool, bsl&colon;&colon;is&lowbar;class&lt;typename bsl&colon;&colon;remove&lowbar;cv&lt;t&lowbar;BASE&gt;&colon;&colon;type&gt;&colon;&colon;value &amp;&amp; bsl&colon;&colon;is&lowbar;class&lt;typename bsl&colon;&colon;remove&lowbar;cv&lt;t&lowbar;DERIVED&gt;&colon;&colon;type&gt;&colon;&colon;value &amp;&amp; bsl&colon;&colon;is&lowbar;convertible&lt;typename bsl&colon;&colon;remove&lowbar;cv&lt;t&lowbar;DERIVED&gt;&colon;&colon;type &ast;, typename bsl&colon;&colon;remove&lowbar;cv&lt;t&lowbar;BASE&gt;&colon;&colon;type &ast;&gt;&colon;&colon;value&gt;]
----

== Description

This `struct` template provides a type trait to determine if one class is an accessible base class of another class&period; Note that, while similar to `std&colon;&colon;is&lowbar;base&lowbar;of`, when the derived relationship is via private, protected, or ambiguous inheritance `IsAccessibleBaseOf` evaluates to false&period;

== Base Classes

[cols="1,4"]
|===
| Name| Description
| `xref:bsl/integral_constant-02.adoc[bsl::integral&lowbar;constant&lt;bool, bsl&colon;&colon;is&lowbar;class&lt;typename bsl&colon;&colon;remove&lowbar;cv&lt;t&lowbar;BASE&gt;&colon;&colon;type&gt;&colon;&colon;value &amp;&amp; bsl&colon;&colon;is&lowbar;class&lt;typename bsl&colon;&colon;remove&lowbar;cv&lt;t&lowbar;DERIVED&gt;&colon;&colon;type&gt;&colon;&colon;value &amp;&amp; bsl&colon;&colon;is&lowbar;convertible&lt;typename bsl&colon;&colon;remove&lowbar;cv&lt;t&lowbar;DERIVED&gt;&colon;&colon;type &ast;, typename bsl&colon;&colon;remove&lowbar;cv&lt;t&lowbar;BASE&gt;&colon;&colon;type &ast;&gt;&colon;&colon;value&gt;]`
| Metafunction representing a compile&hyphen;time constant of the specified (template parameter) `t&lowbar;TYPE` with the specified (template parameter) `t&lowbar;VALUE`&period;
|===

== Type Aliases

[cols="1,4"]
|===
| Name| Description
| xref:bsl/integral_constant-02/type.adoc[`type`] 
| Alias for this `integral&lowbar;constant` specialization&period;
| xref:bsl/integral_constant-02/value_type.adoc[`value&lowbar;type`] 
| Alias for the (template parameter) `t&lowbar;TYPE`&period;
|===


== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:bsl/integral_constant-02/operator_call.adoc[`operator()`] 
| Return a copy of the template argument `t&lowbar;VALUE`&period;
| xref:bsl/integral_constant-02/2conversion.adoc[`operator t&lowbar;TYPE`] 
| Return a copy of the template argument `t&lowbar;VALUE`&period;
|===


== Static Data Members

[cols="1,4"]
|===
| Name| Description
| xref:bsl/integral_constant-02/value.adoc[`value`] 
| The compile&hyphen;time constant value of this metafunction&period;
|===



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