[#bsl-basic_string-0faf-at-09]
= xref:bsl.adoc[bsl]::xref:bsl/basic_string-0faf.adoc[basic_string]::at
:relfileprefix: ../../
:mrdocs:

Return a reference providing modifiable access to the character at the specified `position` in this string. Throw `out_of_range` if `position >= length()`.

== Synopsis

Declared in `<bslstl_string.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:bsl/basic_string-0faf/reference.adoc[reference]
at(xref:bsl/basic_string-0faf/size_type.adoc[size_type] position);
----


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