[#BloombergLP-bdlb-Float-signBit-04bb]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlb.adoc[bdlb]::xref:BloombergLP/bdlb/Float.adoc[Float]::signBit
:relfileprefix: ../../../
:mrdocs:

Return `true` if the specified floating point `number` has its sign bit set (i.e., it is negative), and `false` otherwise. This function is equivalent to the `signbit` macro in C99. Note that this function will return `true` for some NaNs, even though the concepts of negative and positive do not apply to NaNs.

== Synopsis

Declared in `<bdlb_float.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
static
bool
signBit(float number);
----


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