IncludeOS addr naming

.cpp

template <int N = 0>
static auto&& ifconfig(
  IP4::addr addr,
  IP4::addr nmask,
  IP4::addr router,
  IP4::addr dns = IP4::INADDR_ANY
)
{ ... }
	
net::Inet4::ifconfig(
  { 10,0,0,42 },     // IP
  { 255,255,255,0 }, // Netmask
  { 10,0,0,1 },      // Gateway
  { 10,0,0,1 });     // DNS
	

	
// could be


namespace IP4
{
  using mask = addr;
  using router = addr;
  using dns = addr;
}

template <int N = 0>
static auto&& ifconfig(
  IP4::addr addr,
  IP4::mask nmask,
  IP4::router router,
  IP4::dns dns = IP4::INADDR_ANY
)
{ ... }
	
net::Inet4::ifconfig(
  net::IP4::addr{ 10,0,0,42 },
  net::IP4::mask{ 255,255,255,0 },
  net::IP4::router{ 10,0,0,1 },
  net::IP4::dns{ 10,0,0,1 }
);
{ ... }