std::basic_stringbuf<CharT,Traits,Allocator>::swap
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< cpp | io | basic stringbuf
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basic_stringbuf::swap
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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.
[edit] Parameters
rhs
-
another
basic_stringbuf
[edit] Return value
(none)
[edit] Exceptions
May throw implementation-defined exceptions.
(since C++11)(until C++20)
noexcept specification:
(since C++20)noexcept(std::allocator_traits <Allocator>::propagate_on_container_swap::value
|| std::allocator_traits <Allocator>::is_always_equal::value)
|| std::allocator_traits <Allocator>::is_always_equal::value)
[edit] Notes
This function is called automatically when swapping std::stringstream objects. It is rarely necessary to call it directly.
[edit] 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".