isc::dhcp::TokenNot Class Reference

Token that represents logical negation operator. More...

#include <token.h>

Inheritance diagram for isc::dhcp::TokenNot:

Public Member Functions
	TokenNot ()
	Constructor (does nothing)
virtual unsigned	evaluate (Pkt &pkt, ValueStack &values)
	Logical negation.
Public Member Functions inherited from isc::dhcp::Token
virtual	~Token ()
	Virtual destructor.
virtual unsigned	getLabel () const
	Return the label of this token.

Additional Inherited Members
Static Public Member Functions inherited from isc::dhcp::Token
static bool	toBool (std::string value)
	Coverts a (string) value to a boolean.

Detailed Description

Token that represents logical negation operator.

For example in the expression "not(option[vendor-class].text == 'MSF')" this token represents the leading "not"

Definition at line 1009 of file token.h.

Constructor & Destructor Documentation

TokenNot()

isc::dhcp::TokenNot::TokenNot ( )

inline

Constructor (does nothing)

Definition at line 1012 of file token.h.

Member Function Documentation

evaluate()

unsigned TokenNot::evaluate ( Pkt & pkt, ValueStack & values )

virtual

Logical negation.

Evaluation does not use packet information, but rather consumes the last result. It does a simple string comparison and sets the value to either "true" or "false". It requires at least one value to be present on stack and to be either "true" or "false".

Exceptions

EvalBadStack	if there are less than 1 value on stack
EvalTypeError	if the top value on the stack is not either "true" or "false"

Parameters

pkt	(unused)
values	- stack of values (logical top value negated)

Returns

0 which means evaluate next token if any.

Implements isc::dhcp::Token.

Definition at line 1064 of file token.cc.

References isc::dhcp::EVAL_DBG_STACK, isc::dhcp::EVAL_DEBUG_NOT, isc::dhcp::eval_logger, isc::dhcp::Pkt::getLabel(), isc_throw, LOG_DEBUG, and isc::dhcp::Token::toBool().

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The documentation for this class was generated from the following files:

• token.h
• token.cc