std::basic_string<CharT,Traits,Allocator>::operator=
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< cpp | string | basic string
basic_string& operator=( const basic_string& str ); |
(1) | |
(2) | ||
basic_string& operator=( basic_string&& str ); |
(since C++11) (until C++17) |
|
basic_string& operator=( basic_string&& str ) noexcept(/* see below */); |
(since C++17) | |
basic_string& operator=( const CharT* s ); |
(3) | |
basic_string& operator=( CharT ch ); |
(4) | |
basic_string& operator=( std::initializer_list<CharT> ilist ); |
(5) | (since C++11) |
template<class T> basic_string& operator=( const T& t ); |
(6) | (since C++17) |
Replaces the contents of the string.
1) Replaces the contents with a copy of
str
. If *this
and str
are the same object, this function has no effect.2) Replaces the contents with those of
str
using move semantics. str
is in a valid but unspecified state afterwards. If std::allocator_traits<Allocator>::propagate_on_container_move_assignment() is true, the target allocator is replaced by a copy of the source allocator. If it is false and the source and the target allocators do not compare equal, the target cannot take ownership of the source memory and must assign each character individually, allocating additional memory using its own allocator as needed. Unlike other container move assignments, references, pointers, and iterators to str
may be invalidated.3) Replaces the contents with those of null-terminated character string pointed to by
s
as if by assign(s, Traits::length(s)).5) Replaces the contents with those of the initializer list
ilist
as if by assign(ilist.begin(), ilist.size())6) Implicitly converts
t
to a string view sv
as if by std::basic_string_view<CharT, Traits> sv = t;, then replaces the contents with those of the sv
as if by assign(sv). This overload only participates in overload resolution if std::is_convertible_v<const T&, std::basic_string_view<CharT, Traits>> is true and std::is_convertible_v<const T&, const CharT*> is false.Parameters
ch | - | value to initialize characters of the string with |
str | - | string to be used as source to initialize the string with |
s | - | pointer to a null-terminated character string to use as source to initialize the string with |
ilist | - | std::initializer_list to initialize the string with |
t | - | object convertible to std::basic_string_view to initialize the string with |
Return value
*this
Complexity
1) linear in size of
str
2) linear in the size of
this
(formally, each CharT has to be destroyed). If allocators do not compare equal and do not propagate, then also linear in the size of str
(copy must be made)3) linear in size of
s
4) constant.
5) linear in size of
ilist
Exceptions
2)
noexcept specification:
noexcept(std::allocator_traits<Allocator>::propagate_on_container_move_assignment::value || std::allocator_traits<Allocator>::is_always_equal::value) |
(since C++17) |
If the operation would result in size() > max_size()
, throws std::length_error.
If an exception is thrown for any reason, this function has no effect (strong exception guarantee). |
(since C++11) |
Defect reports
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
DR | Applied to | Behavior as published | Correct behavior |
---|---|---|---|
LWG 2063 | C++11 | non-normative note stated that swap is a valid implementation of move assignment | corrected to support allocators |
LWG 2946 | C++17 | string_view overload causes ambiguity in some cases
|
avoided by making it a template |
Example
This section is incomplete Reason: no example |
See also
constructs a basic_string (public member function) | |
assign characters to a string (public member function) |