FBB::InetAddress(3bobcat) Network Byte Order FBB::InetAddress(3bobcat)
FBB::InetAddress - Converting between host byte order and network byte order
Linking option: -lbobcat
Computers differ their word-byte order, called `endianness'. A little-endian computer has its least significant byte at the byte having the
lower address of a two-byte value, whereas a big-endian computer has its least significant byte at at the byte having the higher address of
a two-byte value. In order to allow these computers to communicate over over Internet, host byte order was designed. Objects of the class
FBB::InetAddress may be used to convert between network byte order and host byte order (and vice versa).
The class only has a few public members. Most members are protected, and FBB::InetAddress is therefore primarily used as a base class from
which other classes are derived. In practice there will be little need to construct objects of the class FBB::InetAddress, which is primar-
ily a support class for the FBB socket-classes.
Internally, all data are stored in network byte order.
As the class' constructors depend on the proper functioning of members of the FBB:GetHostent class, the class' objects can only be con-
structed when the host whose name or address is searched can be resolved by a name resolution process, e.g., bind(1).
Objects of the class FBB::InetAddress store address information about a host in a struct sockaddr_in data member. A struct sockaddr_in is
the data type used to represent socket addresses in the Internet namespace. It has the following members:
o sa_family_t sin_family:
This identifies the address family or format of the socket address. It holds the value AF_INET.
o struct in_addr sin_addr:
This is the Internet address of the host machine stored as a binary value.
o size_t short int sin_port:
This field holds the port number.
All constructors, members, operators and manipulators, mentioned in this man-page, are defined in the namespace FBB.
o InetAddress(std::string const &host, uint16_t port):
This constructor expects a host name or dotted decimal address and and an (size_t) port number, and determines the host's address
information. An FBB::Errno exception is thrown if the address could not be determined.
o InetAddress(uint16_t port):
This constructor constructs the `generic' address information that is used when constructing, e.g. server sockets.
o InetAddress(sockaddr_in const &address):
This constructor constructs an FBB::InetAddress object from an initialized sockaddr_in object. It is primarily used to promote a
sockaddr_in to an FBB::InetAddresss.
The (public) copy constructor is available.
o uint16_t port() const:
Accessor returning the object's port value.
o std::string dottedDecimalAddress() const:
Accessor returning the object's Internet address as a dotted decimal string. If the address could not be determined, an FBB::Errno
object is thrown.
o size_t size() const:
Accessor returning the size of the object's sockaddr_in (address) information.
o sockaddr const *sockaddrPtr() const:
Accessor returning the pointer to the object's sockaddr data member.
o sockaddr_in const *sockaddr_inPtr() const:
Accessor returning the pointer to the object's sockaddr_in data member.
PROTECTED MEMBER FUNCTIONS
o sockaddr *sockaddrPtr():
This member returns the object's address information as a pointer to a modifiable struct sockaddr. This allows (contrary to the pub-
lic member having the same name) derived objects to manipulate the object's address information directly.
o sockaddr_in *sockaddr_inPtr():
This member returns the object's address information as a pointer to a modifiable struct sockaddr_in. This allows (contrary to the
public member having the same name) derived objects to manipulate the object's address information directly.
using namespace std;
using namespace FBB;
class A: public InetAddress
int main(int argc, char **argv)
InetAddress const &ia = X();
cout << "A InetAddress was constructed for port " << ia.port() <<
cout << "It has the generic `ANY' address: " <<
ia.dottedDecimalAddress() << endl;
catch (Errno const &e)
cout << "Exception: " << e.why() << endl;
bobcat/inetaddress - defines the class interface
bind(1), bobcat(7), gethostent(3bobcat), socketbase(3bobcat)
o bobcat_3.01.00-x.dsc: detached signature;
o bobcat_3.01.00-x.tar.gz: source archive;
o bobcat_3.01.00-x_i386.changes: change log;
o libbobcat1_3.01.00-x_*.deb: debian package holding the libraries;
o libbobcat1-dev_3.01.00-x_*.deb: debian package holding the libraries, headers and manual pages;
o http://sourceforge.net/projects/bobcat: public archive location;
Bobcat is an acronym of `Brokken's Own Base Classes And Templates'.
This is free software, distributed under the terms of the GNU General Public License (GPL).
Frank B. Brokken (firstname.lastname@example.org).
libbobcat1-dev_3.01.00-x.tar.gz 2005-2012 FBB::InetAddress(3bobcat)