Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. — Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

string::swap

Swap the contents.

Synopsis

void
swap(
    string& other);

Description

Exchanges the contents of this string with another string. Ownership of the respective boost::container::pmr::memory_resource objects is not transferred.

If &other == this, do nothing. Otherwise,
if *other.storage() == *this->storage(), ownership of the underlying memory is swapped in constant time, with no possibility of exceptions. All iterators and references remain valid. Otherwise,
the contents are logically swapped by making copies, which can throw. In this case all iterators and references are invalidated.

Complexity

Constant or linear in size() plus other.size().

Exception Safety

Strong guarantee. Calls to memory_resource::allocate may throw.