Expected behavior

Buffer<> swap all members

Actual behavior

Buffer<> swap don't swap _ownMem member, maybe crash

Steps to reproduce the problem

(please make this a SSCCE, if applicable and reasonable)
test code:

void test() {
  char my[16];
  Poco::Buffer<char> buffer(16);
  Poco::Buffer<char> wrapper(my, sizeof(my));
  buffer.swap(wrapper);
}

test(); // crash 

POCO version

1.7.9

Compiler and version

all

Operating system and version

all

Other relevant inofrmation