Function Documentation▲
[constexpr] void qSwap(T &lhs, T &rhs)▲
Exchanges the values of variables lhs and rhs, taking type-specific swap() overloads into account.
This function is Qt's version of boost::swap(), and is equivalent to
using
std::
swap; // bring std::swap into scope (for built-in types)
swap(lhs, rhs); // unqualified call (picks up type-specific overloads
// via Argument-Dependent Lookup, or falls back to std::swap)
Use this function primarily in generic code, where you would traditionally have written the above two lines, because you don't know anything about T.
If you already know what T is, then use one of the following options, in order of preference:
-
lhs.swap(rhs); if such a member-swap exists
-
std::swap(lhs, rhs); if no type-specific swap() exists
See boost::swap() on boost.org for more details.
See also std::swap on cppreference.com, Swappable on cppreference.com.