[#bsl-operator_plus-08]
= xref:bsl.adoc[bsl]::operator+
:relfileprefix: ../
:mrdocs:

Same as the primary `operator+` for mixed `std`/`bsl` strings with an rvalue `rhs`.

== Synopsis

Declared in `<bslstl_string.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class CHAR_TYPE,
    class CHAR_TRAITS,
    class ALLOC1,
    class ALLOC2>
xref:bsl/basic_string-0faf.adoc[bsl::basic_string<CHAR_TYPE, CHAR_TRAITS, ALLOC2>]
operator+(
    std::basic_string<CHAR_TYPE, CHAR_TRAITS, ALLOC1> const& lhs,
    xref:bsl/basic_string-0faf.adoc[bsl::basic_string<CHAR_TYPE, CHAR_TRAITS, ALLOC2>]&& rhs);
----


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