std::basic_string::assign

 

C++

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언어

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명명된 요구사항

Feature test macros (C++20)

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개념(C++20)

Diagnostics library

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Technical specifications

Symbols index

외부 라이브러리들

 

Strings library

Null-terminated strings

Byte strings

Multibyte strings

Wide strings

Classes

basic_string

char_traits

 

std::basic_string

Member functions basic_string::basic_string basic_string::operator= basic_string::assign basic_string::get_allocator Element access basic_string::at basic_string::operator[] basic_string::front (C++11) basic_string::back (C++11) basic_string::data basic_string::c_str Iterators basic_string::beginbasic_string::cbegin (C++11) basic_string::endbasic_string::cend (C++11) basic_string::rbeginbasic_string::crbegin (C++11) basic_string::rendbasic_string::crend (C++11) Capacity basic_string::empty basic_string::sizebasic_string::length basic_string::max_size basic_string::reserve basic_string::capacity basic_string::shrink_to_fit (C++11)

Operations basic_string::clear basic_string::insert basic_string::erase basic_string::push_back basic_string::pop_back (C++11) basic_string::append basic_string::operator+= basic_string::compare basic_string::replace basic_string::substr basic_string::copy basic_string::resize basic_string::swap Search basic_string::find basic_string::rfind basic_string::find_first_of basic_string::find_first_not_of basic_string::find_last_of basic_string::find_last_not_of Constants basic_string::npos

Non-member functions operator+ operator==operator!=operator<operator>operator<=operator>= swap(std::basic_string) operator<<operator>> getline stoistolstoll (C++11)(C++11)(C++11) stoulstoull (C++11)(C++11) stofstodstold (C++11)(C++11)(C++11) to_string (C++11) to_wstring (C++11) Helper classes hash<std::string>hash<std::wstring>hash<std::u32string>hash<std::u16string> (C++11)

 

basic_string& assign( size_type count, CharT ch );	(1)
basic_string& assign(const basic_string& str );	(2)
	(3)
basic_string& assign(const basic_string& str,                       size_type pos,                       size_type count );			(until C++14)
basic_string& assign(const basic_string& str,                       size_type pos,                       size_type count = npos);			(since C++14)
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)

문자열의 내용을 치환합니다.

1) 내용을 count개의 문자 ch로 치환합니다.

2) 내용을 str의 복사본으로 치환합니다.

3) 내용을 str의 부분 문자열 [pos, pos+count)로 치환합니다. 만약 요청된 부분 문자열이 문자열의 끝을 넘거나 count == npos인 경우에는, [pos, size())가 부분 문자열이 됩니다. pos > str.size()인 경우에는 std::out_of_range 예외가 발생합니다.

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). This overload does not participate in overload resolution if InputIt does not satisfy InputIterator.(since C++11)

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

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
형식의 필요조건
- InputIt 는 다음 조건을 만족해야 한다 : InputIterator.

Return value

*this

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

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.

Example

코드 실행

#include <iostream>#include <iterator>#include <string>   int main(){std::string s;// assign(size_type count, CharT ch) s.assign(4, '=');std::cout<< s <<'\n';// "===="   std::stringconst c("Exemplary");// assign(basic_string const& str) s.assign(c);std::cout<< c <<"=="<< s <<'\n';// "Exemplary == Exemplary"   // assign(basic_string const& str, size_type pos, size_type count) s.assign(c, 0, c.length()-1);std::cout<< s <<'\n';// "Exemplar";   // assign(basic_string&& str) s.assign(std::string("C++ by ")+std::string("example"));std::cout<< s <<'\n';// "C++ by example"   // assign(charT const* s, size_type count) s.assign("C-style string", 7);std::cout<< s <<'\n';// "C-style"   // assign(charT const* s) s.assign("C-style\0string");std::cout<< s <<'\n';// "C-style"   char mutable_c_str[]="C-style string";// assign(InputIt first, InputIt last) s.assign(std::begin(mutable_c_str), std::end(mutable_c_str)-1);std::cout<< s <<'\n';// "C-style string"   // assign(std::initializer_list<charT> ilist) s.assign({'C', '-', 's', 't', 'y', 'l', 'e'});std::cout<< s <<'\n';// "C-style"}

Output:

==== Exemplary==Exemplary Exemplar C++ by example C-style C-style C-style string C-style

See also

(constructor)	constructs a basic_string (public member function)
operator=	assigns values to the string (public member function)