[#BloombergLP-bdlf-Bind_PlaceHolderMask-05]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlf.adoc[bdlf]::Bind_PlaceHolderMask
:relfileprefix: ../../
:mrdocs:

Meta‐function that yields a place‐holder bit‐mask for a bound type.

== Synopsis

Declared in `<bdlf_bind.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class t_BOUND_TYPE>
struct Bind_PlaceHolderMask;
----

== Description

This template, passed the type of one of the bound arguments to a function object, yields:

* If the specified `t_BOUND_TYPE` is a place holder, a mask with the bit at the index of the place holder set.

* If the specified `t_BOUND_TYPE` is a `Bind` or `BindWrapper`, a mask with bit 24 set.

* Zero otherwise.

== Static Data Members

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bdlf/Bind_PlaceHolderMask-05/k_VAL.adoc[`k_VAL`] 
| Bit‐mask value contributed by this bound‐argument type.
|===


== Specializations

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bdlf/Bind_PlaceHolderMask-0e.adoc[`Bind_PlaceHolderMask<PlaceHolder<INDEX>>`] 
| Place‐holder mask specialization for a place‐holder bound type.
| xref:BloombergLP/bdlf/Bind_PlaceHolderMask-01.adoc[`Bind_PlaceHolderMask<Bind<t_RET, t_FUNC, t_BOUND_TUPLE>>`] 
| Place‐holder mask specialization for a nested `Bind` argument.
| xref:BloombergLP/bdlf/Bind_PlaceHolderMask-0b.adoc[`Bind_PlaceHolderMask<BindWrapper<t_RET, t_FUNC, t_BOUND_TUPLE>>`] 
| Place‐holder mask specialization for a nested `BindWrapper` argument.
|===



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