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Showing content from https://en.cppreference.com/w/cpp/string/basic_string/operator+ below:

std::operator+(std::basic_string) - cppreference.com

(1) (constexpr since C++20) (2) (constexpr since C++20) (3) (constexpr since C++20) (4) (since C++26) (5) (constexpr since C++20) (6) (constexpr since C++20) (7) (since C++26) (8) (since C++11)
(constexpr since C++20) (9) (since C++11)
(constexpr since C++20) (10) (since C++11)
(constexpr since C++20) (11) (since C++11)
(constexpr since C++20) (12) (since C++26) (13) (since C++11)
(constexpr since C++20) (14) (since C++11)
(constexpr since C++20) (15) (since C++11)
(constexpr since C++20) (16) (since C++26)

Returns a string containing characters from lhs followed by the characters from rhs. Equivalent to:

8) lhs.append(rhs); return std::move(lhs); except that both lhs and rhs are left in valid but unspecified states. If lhs and rhs have equal allocators, the implementation can move from either.

A string containing characters from lhs followed by the characters from rhs, using the allocator determined as above(since C++11).

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.


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