[#BloombergLP-bdljsn-NumberUtil_IsSigned]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdljsn.adoc[bdljsn]::NumberUtil_IsSigned
:relfileprefix: ../../
:mrdocs:

Metafunction yielding whether integral `t_TYPE` is signed.

== Synopsis

Declared in `<bdljsn_numberutil.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class t_TYPE>
struct NumberUtil_IsSigned
    : xref:bsl/integral_constant-02.adoc[bsl::integral_constant<bool, (t_TYPE(‐1) < t_TYPE(0))>]
----

== Description

This class will be a `bsl::true_type` if the specified (template parameter type) `t_TYPE` is a signed type, and `bsl::false_type` otherwise. `t_TYPE` shall be an integral type. Note that currently bsl::is_signed is not available for C++03 platforms.

== Base Classes

[cols="1,4"]
|===
| Name| Description
| `xref:bsl/integral_constant-02.adoc[bsl::integral_constant<bool, (t_TYPE(‐1) < t_TYPE(0))>]`
| Metafunction representing a compile‐time constant of the specified (template parameter) `t_TYPE` with the specified (template parameter) `t_VALUE`.
|===

== Type Aliases

[cols="1,4"]
|===
| Name| Description
| xref:bsl/integral_constant-02/type.adoc[`type`] 
| Alias for this `integral_constant` specialization.
| xref:bsl/integral_constant-02/value_type.adoc[`value_type`] 
| Alias for the (template parameter) `t_TYPE`.
|===


== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:bsl/integral_constant-02/operator_call.adoc[`operator()`] 
| Return a copy of the template argument `t_VALUE`.
| xref:bsl/integral_constant-02/2conversion.adoc[`operator t_TYPE`] 
| Return a copy of the template argument `t_VALUE`.
|===


== Static Data Members

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



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