20 Strings library [strings]

20.3 String classes [string.classes]

20.3.3 Non-member functions [string.nonmembers]

20.3.3.1 operator+ [string.op+]

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template<class charT, class traits, class Allocator> basic_string<charT, traits, Allocator> operator+(const basic_string<charT, traits, Allocator>& lhs, const basic_string<charT, traits, Allocator>& rhs);
1
#
Returns: basic_­string<charT, traits, Allocator>(lhs).append(rhs).
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template<class charT, class traits, class Allocator> basic_string<charT, traits, Allocator> operator+(basic_string<charT, traits, Allocator>&& lhs, const basic_string<charT, traits, Allocator>& rhs);
2
#
Returns: std​::​move(lhs.append(rhs)).
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template<class charT, class traits, class Allocator> basic_string<charT, traits, Allocator> operator+(const basic_string<charT, traits, Allocator>& lhs, basic_string<charT, traits, Allocator>&& rhs);
3
#
Returns: std​::​move(rhs.insert(0, lhs)).
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template<class charT, class traits, class Allocator> basic_string<charT, traits, Allocator> operator+(basic_string<charT, traits, Allocator>&& lhs, basic_string<charT, traits, Allocator>&& rhs);
4
#
Returns: std​::​move(lhs.append(rhs)).
[ Note
:
Or equivalently, std​::​move(rhs.insert(0, lhs)).
— end note
 ]
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template<class charT, class traits, class Allocator> basic_string<charT, traits, Allocator> operator+(const charT* lhs, const basic_string<charT, traits, Allocator>& rhs);
5
#
Returns: basic_­string<charT, traits, Allocator>(lhs) + rhs.
6
#
Remarks: Uses traits​::​length().
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template<class charT, class traits, class Allocator> basic_string<charT, traits, Allocator> operator+(const charT* lhs, basic_string<charT, traits, Allocator>&& rhs);
7
#
Returns: std​::​move(rhs.insert(0, lhs)).
8
#
Remarks: Uses traits​::​length().
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template<class charT, class traits, class Allocator> basic_string<charT, traits, Allocator> operator+(charT lhs, const basic_string<charT, traits, Allocator>& rhs);
9
#
Returns: basic_­string<charT, traits, Allocator>(1, lhs) + rhs.
🔗
template<class charT, class traits, class Allocator> basic_string<charT, traits, Allocator> operator+(charT lhs, basic_string<charT, traits, Allocator>&& rhs);
10
#
Returns: std​::​move(rhs.insert(0, 1, lhs)).
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template<class charT, class traits, class Allocator> basic_string<charT, traits, Allocator> operator+(const basic_string<charT, traits, Allocator>& lhs, const charT* rhs);
11
#
Returns: lhs + basic_­string<charT, traits, Allocator>(rhs).
12
#
Remarks: Uses traits​::​length().
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template<class charT, class traits, class Allocator> basic_string<charT, traits, Allocator> operator+(basic_string<charT, traits, Allocator>&& lhs, const charT* rhs);
13
#
Returns: std​::​move(lhs.append(rhs)).
14
#
Remarks: Uses traits​::​length().
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template<class charT, class traits, class Allocator> basic_string<charT, traits, Allocator> operator+(const basic_string<charT, traits, Allocator>& lhs, charT rhs);
15
#
Returns: lhs + basic_­string<charT, traits, Allocator>(1, rhs).
🔗
template<class charT, class traits, class Allocator> basic_string<charT, traits, Allocator> operator+(basic_string<charT, traits, Allocator>&& lhs, charT rhs);
16
#
Returns: std​::​move(lhs.append(1, rhs)).