24 Strings library [strings]

24.3 String classes [string.classes]

24.3.3 basic_­string non-member functions [string.nonmembers]

24.3.3.1 operator+ [string.op+]

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).

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)).

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)).

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 ]

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().

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().

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)).

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().

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().

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)).