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

Concept that a type supports boolean testing and logical negation with the conventional semantics defined by the C++20 standard [concept.booleantestable].

== Synopsis

Declared in `<bslmf_booleantestable.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class t_TYPE>
concept BooleanTestable = BooleanTestable_Impl<t_TYPE> &&
    requires(t_TYPE&& t) {
        { !static_cast<t_TYPE&&>(t) } ‐> BooleanTestable_Impl;
    };
----


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