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ost_IPV4Mask

NAME

ost::IPV4Mask -

Internet addresses used specifically as masking addresses (such as '
 255.255.255.0') are held in the IPV4Mask derived object.  

SYNOPSIS

#include <address.h>

Inherits ost::IPV4Address.

Public Member Functions

IPV4Mask (const char *mask)
Create the mask from a null terminated ASCII string such as '255.255.255.128'.
IPV4Address & operator= (unsigned long addr)
Allows assignment from the return of functions like inet_addr() or htonl().

Friends

__EXPORT IPV4Host operator& (const IPV4Host &addr, const IPV4Mask &mask)
Masks are usually used to coerce host addresses into a specific router or class domain.

Detailed Description

Internet addresses used specifically as masking addresses (such as '
 255.255.255.0') are held in the IPV4Mask derived object. 

The seperate class is used so that C++ type casting can automatically determine when an IPV4Address object is really a mask address object rather than simply using the base class. This also allows manipulative operators for address masking to operate only when presented with a Masked address as well as providing cleaner and safer source.

Author:

David Sugar <dyfet@ostel.com> Internet Address Mask such as subnet masks.

Constructor & Destructor Documentation

ost::IPV4Mask::IPV4Mask (const char * mask)

Create the mask from a null terminated ASCII string such as '255.255.255.128'. Parameters:

mask null terminated ASCII mask string.

Member Function Documentation

IPV4Address& ost::IPV4Mask::operator= (unsigned long addr) [inline]

Allows assignment from the return of functions like inet_addr() or htonl().

Reimplemented from ost::IPV4Address.

References ost::IPV4Address::operator=().

Friends And Related Function Documentation

__EXPORT IPV4Host operator& (const IPV4Host & addr, const IPV4Mask & mask) [friend]

Masks are usually used to coerce host addresses into a specific router or class domain. This can be done by taking the Inet Host Address object and 'and'ing it with an address mask. This operation can be directly expressed in C++ through the & operator.

Returns:

a internet host address that has been masked.

Parameters:

addr host address to be masked by subnet.
mask inetnet mask address object to mask by.

Author

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