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# std::basic_string::assign

From cppreference.com
< cpp‎ | string‎ | basic string

basic_string& assign( size_type count, CharT ch ); | (1) |
basic_string& assign( const basic_string& str ); | (2) |
basic_string& assign( const basic_string& str, size_type pos, size_type count ); | (3) |
basic_string& assign( basic_string&& str ); | (4) | (since C++11)
basic_string& assign( const CharT* s, size_type count ); | (5) |
basic_string& assign( const CharT* s ); | (6) |
template< class InputIt > basic_string& assign( InputIt first, InputIt last ); | (7) |
basic_string& assign( std::initializer_list<CharT> ilist ); | (8) | (since C++11)

Replaces the contents of the string.

1) Replaces the contents with `count` copies of charactor `ch`

2) Replaces the contents with a copy of `str`

3) Replaces the contents with a substring `[pos, pos+count)` of `str`. If the requested substring lasts past the end of the string, or if count == npos, the resulting substring is `[pos, size())`. If pos >= str.size(), std::out_of_range is thrown.

4) Replaces the contents with those of `str` using move semantics. `str` is in undefined state after the operation.

5) Replaces the contents with the first `count` characters of character string pointed to by `s`. `s` can contain null characters.

6) Replaces the contents with those of null-terminated character string pointed to by `s`. The length of the string is determined by the first null character.

7) Replaces the contents with copies of the characters in the range `[first, last)`

8) Replaces the contents with those of the initializer list `ilist`.

### [edit] Parameters

count | - | size of the resulting string
ch | - | value to initialize characters of the string with
first, last | - | range to copy the characters from
str | - | string to be used as source to initialize the characters with
s | - | pointer to a character string to use as source to initialize the string with
init | - | initializer list to initialize the characters of the string with
Type requirements
- `InputIt` must meet the requirements of `InputIterator`.

### [edit] Return value

*this

### [edit] Complexity

1) linear in `count`

2) linear in size of `str`

3) linear in `count`

4) constant. If `alloc` is given and alloc != other.get_allocator(), then linear.

5) linear in `count`

6) linear in size of `s`

7) linear in distance between `first` and `last`

8) linear in size of `init`

### [edit] Exceptions

If an exception is thrown for any reason, this function has no effect (strong exception guarantee).(since C++11)

If the operation would result in `size() > max_size()`, throws std::length_error.

### [edit] Example

| This section is incomplete Reason: no example

### [edit] See also

(constructor) | constructs a `basic_string` (public member function) [edit]
operator= | assigns values to the string (public member function) [edit]

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