std::basic_stringbuf<CharT,Traits,Allocator>::swap

 

C++

Compiler support

Freestanding and hosted

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Standard library

Standard library headers

Named requirements

Feature test macros (C++20)

Language support library

Concepts library (C++20)

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Metaprogramming library (C++11)

General utilities library

Containers library

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Technical specifications

Symbols index

External libraries

 

Input/output library

I/O manipulators

Print functions (C++23)

C-style I/O

Buffers

basic_streambuf

basic_filebuf

basic_stringbuf

basic_spanbuf (C++23)

strstreambuf (C++98/26*)

basic_syncbuf (C++20)

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ios_base

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basic_stringstream

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basic_ispanstream (C++23)

basic_ospanstream (C++23)

basic_spanstream (C++23)

istrstream (C++98/26*)

ostrstream (C++98/26*)

strstream (C++98/26*)

Synchronized Output

basic_osyncstream (C++20)

Types

streamoff

streamsize

fpos

Error category interface

iostream_category (C++11)

io_errc (C++11)

 

std::basic_stringbuf

Public member functions

basic_stringbuf::basic_stringbuf

basic_stringbuf::operator= (C++11)

basic_stringbuf::swap (C++11)

basic_stringbuf::str

basic_stringbuf::get_allocator (C++20)

basic_stringbuf::view (C++20)

Protected member functions

basic_stringbuf::underflow

basic_stringbuf::pbackfail

basic_stringbuf::overflow

basic_stringbuf::setbuf

basic_stringbuf::seekoff

basic_stringbuf::seekpos

Non-member functions

swap(std::basic_stringbuf) (C++11)

Exposition-only member functions

basic_stringbuf::init_buf_ptrs

 

void swap( basic_stringbuf& rhs );		(since C++11) (until C++20)
void swap( basic_stringbuf& rhs ) noexcept(/* see below */);		(since C++20)

Swaps the state and the contents of *this and rhs.

The behavior is undefined if Allocator does not propagate on swap and the allocators of *this and other are unequal.

(since C++11)

Parameters

rhs

-

another basic_stringbuf

Return value

(none)

Exceptions

May throw implementation-defined exceptions.	(since C++11) (until C++20)
noexcept specification:   noexcept(std::allocator_traits<Allocator>::propagate_on_container_swap::value || std::allocator_traits<Allocator>::is_always_equal::value)	(since C++20)

Notes

This function is called automatically when swapping std::stringstream objects. It is rarely necessary to call it directly.

Example

Run this code

#include <iomanip>
#include <iostream>
#include <sstream>
#include <string>
 
int main()
{
    std::istringstream one("one");
    std::ostringstream two("two");
 
    std::cout << "Before swap: one = " << std::quoted(one.str()
              << ", two = " << std::quoted(two.str() << ".\n";
 
    one.rdbuf()->swap(*two.rdbuf();
 
    std::cout << "After  swap: one = " << std::quoted(one.str()
              << ", two = " << std::quoted(two.str() << ".\n";
}

Output:

Before swap: one = "one", two = "two".
After  swap: one = "two", two = "one".

See also

(constructor)	constructs a basic_stringbuf object (public member function)
swap (C++11)	swaps two string streams (public member function of std::basic_stringstream<CharT,Traits,Allocator>)

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