[#bsl-basic_string-0f3-operator_plus_eq-03e]
= xref:bsl.adoc[bsl]::xref:bsl/basic_string-0f3.adoc[basic_string<char32_t>]::operator+=
:relfileprefix: ../../
:mrdocs:

Append the specified `rhs` string to this string, and return a reference providing modifiable access to this string.

== Synopsis

Declared in `<bslstl_string.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class ALLOC2>
xref:bsl/basic_string-0faf.adoc[basic_string<char32_t>]&
operator+=(std::basic_string<char32_t, char_traits<char32_t>, ALLOC2> const& rhs);
----


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