21 Strings library [strings]

21.3 String classes [string.classes]

21.3.4 Non-member functions [string.nonmembers]

21.3.4.1 operator+ [string.op.plus]

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template<class charT, class traits, class Allocator> constexpr basic_string<charT, traits, Allocator> operator+(const basic_string<charT, traits, Allocator>& lhs, const basic_string<charT, traits, Allocator>& rhs); template<class charT, class traits, class Allocator> constexpr basic_string<charT, traits, Allocator> operator+(const basic_string<charT, traits, Allocator>& lhs, const charT* rhs);
1
#
Effects: Equivalent to: basic_string<charT, traits, Allocator> r = lhs; r.append(rhs); return r;
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template<class charT, class traits, class Allocator> constexpr basic_string<charT, traits, Allocator> operator+(basic_string<charT, traits, Allocator>&& lhs, const basic_string<charT, traits, Allocator>& rhs); template<class charT, class traits, class Allocator> constexpr basic_string<charT, traits, Allocator> operator+(basic_string<charT, traits, Allocator>&& lhs, const charT* rhs);
2
#
Effects: Equivalent to: lhs.append(rhs); return std::move(lhs);
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template<class charT, class traits, class Allocator> constexpr basic_string<charT, traits, Allocator> operator+(basic_string<charT, traits, Allocator>&& lhs, basic_string<charT, traits, Allocator>&& rhs);
3
#
Effects: Equivalent to: lhs.append(rhs); return std::move(lhs); except that both lhs and rhs are left in valid but unspecified states.
[Note 1:
If lhs and rhs have equal allocators, the implementation can move from either.
— end note]
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template<class charT, class traits, class Allocator> constexpr basic_string<charT, traits, Allocator> operator+(const basic_string<charT, traits, Allocator>& lhs, basic_string<charT, traits, Allocator>&& rhs); template<class charT, class traits, class Allocator> constexpr basic_string<charT, traits, Allocator> operator+(const charT* lhs, basic_string<charT, traits, Allocator>&& rhs);
4
#
Effects: Equivalent to: rhs.insert(0, lhs); return std::move(rhs);
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template<class charT, class traits, class Allocator> constexpr basic_string<charT, traits, Allocator> operator+(const charT* lhs, const basic_string<charT, traits, Allocator>& rhs);
5
#
Effects: Equivalent to: basic_string<charT, traits, Allocator> r = rhs; r.insert(0, lhs); return r;
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template<class charT, class traits, class Allocator> constexpr basic_string<charT, traits, Allocator> operator+(charT lhs, const basic_string<charT, traits, Allocator>& rhs);
6
#
Effects: Equivalent to: basic_string<charT, traits, Allocator> r = rhs; r.insert(r.begin(), lhs); return r;
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template<class charT, class traits, class Allocator> constexpr basic_string<charT, traits, Allocator> operator+(charT lhs, basic_string<charT, traits, Allocator>&& rhs);
7
#
Effects: Equivalent to: rhs.insert(rhs.begin(), lhs); return std::move(rhs);
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template<class charT, class traits, class Allocator> constexpr basic_string<charT, traits, Allocator> operator+(const basic_string<charT, traits, Allocator>& lhs, charT rhs);
8
#
Effects: Equivalent to: basic_string<charT, traits, Allocator> r = lhs; r.push_back(rhs); return r;
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template<class charT, class traits, class Allocator> constexpr basic_string<charT, traits, Allocator> operator+(basic_string<charT, traits, Allocator>&& lhs, charT rhs);
9
#
Effects: Equivalent to: lhs.push_back(rhs); return std::move(lhs);