[#bsl-operator_plus-0dd]
= xref:bsl.adoc[bsl]::operator+
:relfileprefix: ../
:mrdocs:

Same as the primary `operator+` for mixed `bsl`/`std` strings.

== 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, ALLOC1>]
operator+(
    xref:bsl/basic_string-0faf.adoc[bsl::basic_string<CHAR_TYPE, CHAR_TRAITS, ALLOC1>] const& lhs,
    std::basic_string<CHAR_TYPE, CHAR_TRAITS, ALLOC2> const& rhs);
----


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