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 Methods
DLLEXPORT	HashAssignmentHelper (ExceptionSink *xsink, QoreHashNode &n_h, const QoreString &key, bool must_already_exist=false)
	constructor taking a const QoreString& More...
DLLEXPORT	HashAssignmentHelper (ExceptionSink *xsink, QoreHashNode &n_h, const QoreString *key, bool must_already_exist=false)
	constructor taking a const QoreString& More...
DLLEXPORT	HashAssignmentHelper (HashIterator &hi)
	constructor taking a HashIterator& More...
DLLEXPORT	HashAssignmentHelper (QoreHashNode &n_h, const char *key, bool must_already_exist=false)
	constructor taking a const char* More...
DLLEXPORT	HashAssignmentHelper (QoreHashNode &n_h, const std::string &key, bool must_already_exist=false)
	constructor taking a const std::string& More...
DLLEXPORT	~HashAssignmentHelper ()
	destroys the object and does post processing on the new value
DLLEXPORT void	assign (QoreValue 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...
DLLEXPORT QoreValue	get () const
	returns the current value of the hash key; the pointer returned is still owned by the hash More...
DLLEXPORT	operator bool () const
	returns true if the object is holding a valid pointer, false if not More...
DLLEXPORT QoreValue	operator* () const
	returns the current value of the hash key; any pointer returned is still owned by the hash More...
DLLEXPORT void	reassign (const char *key, bool must_already_exist=false)
	reassigns the object to the given key for a new assignment More...
DLLEXPORT void	reassign (const std::string &key, bool must_already_exist=false)
	reassigns the object to the given key for a new assignment More...
DLLEXPORT QoreValue	swap (QoreValue 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...

Private 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

HashAssignmentHelper() [1/5]

DLLEXPORT 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

HashAssignmentHelper() [2/5]

DLLEXPORT 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

HashAssignmentHelper() [3/5]

DLLEXPORT 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

HashAssignmentHelper() [4/5]

DLLEXPORT 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

HashAssignmentHelper() [5/5]

DLLEXPORT HashAssignmentHelper::HashAssignmentHelper

(

HashIterator &

hi

)

constructor taking a HashIterator&

Parameters

hi	the HashIterator to use for the key and hash

Member Function Documentation

assign()

DLLEXPORT void HashAssignmentHelper::assign	(	QoreValue	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)

get()

DLLEXPORT QoreValue HashAssignmentHelper::get

(

)

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

Since

Qore 0.9

operator bool()

DLLEXPORT HashAssignmentHelper::operator bool

(

)

const

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

in case this function returns false

operator*()

DLLEXPORT QoreValue HashAssignmentHelper::operator*

(

)

const

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

Returns

the current value of the hash key

reassign() [1/2]

DLLEXPORT void HashAssignmentHelper::reassign	(	const char *	key,
		bool	must_already_exist = false
	)

reassigns the object to the given key for a new assignment

Parameters

key	the key to assign
must_already_exist	if true, then this function will not create a new key

Since

Qore 0.8.12

reassign() [2/2]

DLLEXPORT void HashAssignmentHelper::reassign	(	const std::string &	key,
		bool	must_already_exist = false
	)

reassigns the object to the given key for a new assignment

Parameters

key	the key to assign
must_already_exist	if true, then this function will not create a new key

Since

Qore 0.8.12

swap()

DLLEXPORT QoreValue HashAssignmentHelper::swap	(	QoreValue	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:

• /tmp/qore/include/qore/QoreHashNode.h