[#absl-AnySpan-subspan]
= xref:absl.adoc[absl]::xref:absl/AnySpan.adoc[AnySpan]::subspan
:relfileprefix: ../../
:mrdocs:

Returns a subspan starting at `pos` and spanning `len` elements.

== Synopsis

Declared in `<absl/types/any_span.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
constexpr
xref:absl/AnySpan.adoc[AnySpan]
subspan(
    xref:absl/AnySpan/size_type.adoc[size_type] pos,
    xref:absl/AnySpan/size_type.adoc[size_type] len = npos) const;
----

== Description

`pos` must be `<= size()`. `len` must be `<= size() ‐ pos` or `npos`; when `npos`, the subspan runs to the end. The container and transform must stay valid, though this span may become invalid before the subspan.

== Return Value

A span over the requested range.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *pos*
| Index of the first element of the subspan.
| *len*
| Number of elements in the subspan, or `npos` for the rest.
|===


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