[#bsl-basic_string-0f3-back-0c]
= xref:bsl.adoc[bsl]::xref:bsl/basic_string-0f3.adoc[basic_string<char32_t>]::back
:relfileprefix: ../../
:mrdocs:

Return a reference providing modifiable access to the character at the last position in this string. The behavior is undefined if this string is empty. Note that the last position is `length() ‐ 1`.

== Synopsis

Declared in `<bslstl_string.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
char32_t&
back();
----


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