isc::dhcp::TokenPopOrBranchFalse Class Reference

Token that represents pop or branch if false. More...

#include <token.h>

Inheritance diagram for isc::dhcp::TokenPopOrBranchFalse:

Public Member Functions
	TokenPopOrBranchFalse (const unsigned target)
	Constructor.
virtual unsigned	evaluate (Pkt &pkt, ValueStack &values)
	Looks at the top of stack which must be "false" or "true".
Public Member Functions inherited from isc::dhcp::TokenBranch
	TokenBranch (const unsigned target)
	Constructor.
unsigned	getTarget () const
	Returns branchtarget.
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.
Protected Attributes inherited from isc::dhcp::TokenBranch
unsigned	target_

Detailed Description

Token that represents pop or branch if false.

Branch to a forward target when the top value is false else pop it. Can be used to implement the left "and" boolean operator.

Definition at line 1505 of file token.h.

Constructor & Destructor Documentation

TokenPopOrBranchFalse()

TokenPopOrBranchFalse::TokenPopOrBranchFalse

(

const unsigned

target

)

Constructor.

Parameters

target

the label to branch to

Exceptions

EvalParseError

when target is 0

Definition at line 1556 of file token.cc.

Member Function Documentation

evaluate()

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

virtual

Looks at the top of stack which must be "false" or "true".

On "true" pops it and returns 0, on "false" return the branch target.

Parameters

pkt	(unused)
values	- stack of values (use/pop boolean top of stack)

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"

Returns

next label or 0 when means evaluate next token if any.

Reimplemented from isc::dhcp::TokenBranch.

Definition at line 1561 of file token.cc.

References isc::dhcp::EVAL_DBG_STACK, isc::dhcp::EVAL_DEBUG_POP_OR_BRANCH_FALSE, isc::dhcp::eval_logger, isc_throw, LOG_DEBUG, isc::dhcp::TokenBranch::target_, and isc::dhcp::Token::toBool().

Here is the call graph for this function:

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

• token.h
• token.cc