bsl::function::operator=

Set the target of this object to the target (if any) held by the specified rhs object, destroy the target (if any) previously held by *this, and return *this. The result is equivalent to having constructed *this from rhs using the extended move constructor with allocator this->get_allocator(). If an exception is thrown, rhs will have a valid but unspecified value and *this will not be modified. Note that an exception will never be thrown if get_allocator() == rhs.get_allocator().