HashAssignmentHelper Class Reference

use this class to make assignments to hash keys from a pointer to the key value More...

#include <QoreHashNode.h>

Public Member Functions
DLLLOCAL	HashAssignmentHelper (QoreHashNode &n_h, const char *key, bool must_already_exist=false)
	constructor taking a const char* More...
DLLLOCAL	HashAssignmentHelper (QoreHashNode &n_h, const std::string &key, bool must_already_exist=false)
	constructor taking a const std::string& More...
DLLLOCAL	HashAssignmentHelper (ExceptionSink *xsink, QoreHashNode &n_h, const QoreString &key, bool must_already_exist=false)
	constructor taking a const QoreString& More...
DLLLOCAL	HashAssignmentHelper (ExceptionSink *xsink, QoreHashNode &n_h, const QoreString *key, bool must_already_exist=false)
	constructor taking a const QoreString& More...
DLLLOCAL	HashAssignmentHelper (HashIterator &hi)
	constructor taking a HashIterator& More...
DLLLOCAL	~HashAssignmentHelper ()
	destroys the object and does post processing on the new value
DLLLOCAL void	assign (AbstractQoreNode *v, ExceptionSink *xsink)
	assigns a value to the hash key, dereferences any old value, assumes that the value is already referenced for the assignment More...
DLLLOCAL	operator bool () const
	returns true if the object is holding a valid pointer, false if not More...
DLLLOCAL AbstractQoreNode *	operator* () const
	returns the current value of the hash key; the pointer returned is still owned by the hash More...
DLLLOCAL AbstractQoreNode *	swap (AbstractQoreNode *v, ExceptionSink *xsink)
	swaps the current value with the new value of the hash key, assumes that the new value is already referenced for the assignment; returns the old value More...

Protected Attributes
class hash_assignment_priv *	priv
	private implementation

Detailed Description

use this class to make assignments to hash keys from a pointer to the key value

Constructor & Destructor Documentation

DLLLOCAL HashAssignmentHelper::HashAssignmentHelper	(	QoreHashNode &	n_h,
		const char *	key,
		bool	must_already_exist = false
	)

constructor taking a const char*

Parameters

n_h	the hash to use
key	the key to assign
must_already_exist	if true, then this constructor will only succeed if the key already exists

DLLLOCAL HashAssignmentHelper::HashAssignmentHelper	(	QoreHashNode &	n_h,
		const std::string &	key,
		bool	must_already_exist = false
	)

constructor taking a const std::string&

Parameters

n_h	the hash to use
key	the key to assign
must_already_exist	if true, then this constructor will only succeed if the key already exists

DLLLOCAL HashAssignmentHelper::HashAssignmentHelper	(	ExceptionSink *	xsink,
		QoreHashNode &	n_h,
		const QoreString &	key,
		bool	must_already_exist = false
	)

constructor taking a const QoreString&

this constructor may raise a Qore-language exception if the key argument cannot be successfully converted to the default encoding, in which case no further functions should be called on the object

Parameters

xsink	the container object for Qore-language exceptions, in case one is thrown trying to covert the key encoding to the default encoding
n_h	the hash to use
key	the key to assign
must_already_exist	if true, then this constructor will only succeed if the key already exists

DLLLOCAL HashAssignmentHelper::HashAssignmentHelper	(	ExceptionSink *	xsink,
		QoreHashNode &	n_h,
		const QoreString *	key,
		bool	must_already_exist = false
	)

constructor taking a const QoreString&

this constructor may raise a Qore-language exception if the key argument cannot be successfully converted to the default encoding, in which case no further functions should be called on the object

Parameters

xsink	the container object for Qore-language exceptions, in case one is thrown trying to covert the key encoding to the default encoding
n_h	the hash to use
key	the key to assign
must_already_exist	if true, then this constructor will only succeed if the key already exists

DLLLOCAL HashAssignmentHelper::HashAssignmentHelper

(

HashIterator &

hi

)

constructor taking a HashIterator&

Parameters

hi	the HashIterator to use for the key and hash

Member Function Documentation

DLLLOCAL void HashAssignmentHelper::assign	(	AbstractQoreNode *	v,
		ExceptionSink *	xsink
	)

assigns a value to the hash key, dereferences any old value, assumes that the value is already referenced for the assignment

a Qore-language exception could be raised when the existing value is dereferenced (i.e. if it's an object that goes out of scope and the destructor raises an exception, for example)

DLLLOCAL HashAssignmentHelper::operator bool

(

)

const

returns true if the object is holding a valid pointer, false if not

in case this function returns false

DLLLOCAL AbstractQoreNode* HashAssignmentHelper::operator*

(

)

const

returns the current value of the hash key; the pointer returned is still owned by the hash

Returns

the current value of the hash key

DLLLOCAL AbstractQoreNode* HashAssignmentHelper::swap	(	AbstractQoreNode *	v,
		ExceptionSink *	xsink
	)

swaps the current value with the new value of the hash key, assumes that the new value is already referenced for the assignment; returns the old value

could throw a Qore-language exception if there is a type error; in this case 0 is returned and the value passed for the assignment is dereferenced

Returns

the old value of the hash key including its reference count (the old value is not dereferenced); the caller owns the value returned

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

• include/qore/QoreHashNode.h (6813)