[#bsl-operator_plus-06c]
= xref:bsl.adoc[bsl]::operator+
:relfileprefix: ../
:mrdocs:

Return the concatenation of strings constructed from the specified `lhs` and `rhs` arguments, i.e., `basic_string(lhs).append(rhs)`. The allocator of the returned string is determined per the rules in P1165 (https://www.open‐std.org/jtc1/sc22/wg21/docs/papers/2018/p1165r1.html). Note that overloads that accept rvalue references are implemented for C++11 and later only.

== Synopsis

Declared in `<bslstl_string.h>`

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


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