QoreHashNode Class Reference

This is the hash or associative list container type in Qore, dynamically allocated only, reference counted. More...

`#include <QoreHashNode.h>`

Inheritance diagram for QoreHashNode:
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Collaboration diagram for QoreHashNode:
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## Public Member Functions

DLLEXPORT | QoreHashNode ()
| creates an empty hash
DLLEXPORT | QoreHashNode (const TypedHashDecl *hd, ExceptionSink *xsink)
| creates a hash of the specific type; the hash is initialized according to the hashdecl declaration More...
DLLEXPORT | QoreHashNode (const QoreTypeInfo *valueTypeInfo)
| creates an empty hash with the specific value type More...
DLLLOCAL void | clearNeedsEval ()
| sets "needs_eval" to false and "value" to true
DLLEXPORT bool | compareHard (const QoreHashNode *h, ExceptionSink *xsink) const
| does a deep "hard" compare of all hash elements (no type conversions are performed) and returns true if the hashes are equal More...
DLLEXPORT bool | compareSoft (const QoreHashNode *h, ExceptionSink *xsink) const
| does a deep "soft" compare of all hash elements (types may be converted for the comparison) and returns true if the hashes are equal More...
DLLEXPORT QoreHashNode * | copy () const
| performs a copy of the hash and returns the new hash More...
DLLEXPORT void | deleteKey (const QoreString *key, ExceptionSink *xsink)
| performs a delete operation on the value of the given key More...
DLLEXPORT void | deleteKey (const char *key, ExceptionSink *xsink)
| performs a delete operation on the value of the given key More...
DLLEXPORT bool | empty () const
| returns true if the hash has no members, false if not More...
DLLEXPORT bool | existsKey (const char *key) const
| returns true if the hash contains the given key More...
DLLEXPORT bool | existsKeyValue (const char *key) const
| returns true if the hash contains the given key and the key has a value (i.e. is not NOTHING) More...
virtual DLLEXPORT bool | getAsBoolImpl () const
| returns false unless perl-boolean-evaluation is enabled, in which case it returns false only when empty More...
virtual DLLEXPORT int | getAsString (QoreString &str, int foff, ExceptionSink *xsink) const
| concatenate the verbose string representation of the list (including all contained values) to an existing QoreString More...
virtual DLLEXPORT QoreString * | getAsString (bool &del, int foff, ExceptionSink *xsink) const
| returns a QoreString giving the verbose string representation of the List (including all contained values) More...
DLLEXPORT const char * | getFirstKey () const
| returns the cstring value of the first key in the hash More...
DLLEXPORT const TypedHashDecl * | getHashDecl () const
| returns the hash's type declaration, if any More...
DLLEXPORT int64 | getKeyAsBigInt (const char *key, bool &found) const
| returns the value of the key as an int64 More...
DLLEXPORT bool | getKeyAsBool (const char *key, bool &found) const
| returns the value of the key as a bool More...
DLLEXPORT QoreListNode * | getKeys () const
| returns a QoreListNode of QoreStringNode pointers representing all keys in the hash, caller owns the reference count returned More...
DLLEXPORT QoreValue | getKeyValue (const char *key, ExceptionSink *xsink) const
| returns the value of the given key More...
DLLEXPORT QoreValue | getKeyValue (const char *key) const
| returns the value of the given key More...
DLLEXPORT QoreValue | getKeyValue (const QoreString &key, ExceptionSink *xsink) const
| returns the value of the given key More...
DLLEXPORT QoreValue | getKeyValueExistence (const char *key, bool &exists, ExceptionSink *xsink) const
| returns the value of the given key More...
DLLEXPORT QoreValue | getKeyValueExistence (const char *key, bool &exists) const
| returns the value of the given key More...
DLLEXPORT QoreValue | getKeyValueExistence (const QoreString &key, bool &exists, ExceptionSink *xsink) const
| returns the value of the given key More...
DLLEXPORT QoreValue | getKeyValueExistence (const QoreString &key, bool &exists) const
| returns the value of the given key More...
DLLEXPORT const char * | getLastKey () const
| returns the cstring value of the last key in the hash More...
DLLEXPORT const QoreTypeInfo * | getTypeInfo () const
| returns the type info structure for the current value; also works for hashes derived from a TypedHashDecl or with a specific value type More...
virtual DLLEXPORT const char * | getTypeName () const
| returns the type name as a c string More...
DLLEXPORT QoreListNode * | getValues () const
| returns a QoreListNode of AbstractQoreNode pointers representing all values in the hash; caller owns the reference count returned More...
DLLEXPORT const QoreTypeInfo * | getValueTypeInfo () const
| returns the value type declaration (only possible if there is no hashdecl set) More...
DLLEXPORT QoreHashNode * | hashRefSelf () const
| returns "this" with an incremented reference count More...
virtual DLLEXPORT bool | is_equal_hard (const AbstractQoreNode *v, ExceptionSink *xsink) const
| tests for equality ("deep compare" including all contained values) without type conversions (hard compare) More...
virtual DLLEXPORT bool | is_equal_soft (const AbstractQoreNode *v, ExceptionSink *xsink) const
| tests for equality ("deep compare" including all contained values) with possible type conversion (soft compare) More...
DLLEXPORT void | merge (const QoreHashNode *h, ExceptionSink *xsink)
| appends all key-value pairs of "h" to this hash More...
virtual DLLLOCAL int | parseInit (QoreValue &val, QoreParseContext &parse_context)
| initializes during parsing
virtual DLLEXPORT AbstractQoreNode * | realCopy () const
| performs a copy of the hash and returns the new hash More...
DLLEXPORT void | removeKey (const QoreString *key, ExceptionSink *xsink)
| removes the given key from the hash and derefences its value, if any More...
DLLEXPORT void | removeKey (const char *key, ExceptionSink *xsink)
| removes the given key from the hash and derefences its value, if any More...
DLLEXPORT int | setKeyValue (const char *key, QoreValue value, ExceptionSink *xsink)
| sets the value of "key" to "value" More...
DLLEXPORT int | setKeyValue (const QoreString &key, QoreValue value, ExceptionSink *xsink)
| sets the value of "key" to "value" More...
DLLLOCAL void | setNeedsEval ()
| sets "needs_eval" to true and "value" to false
DLLEXPORT size_t | size () const
| returns the number of members in the hash, executes in constant time More...
DLLEXPORT QoreValue | takeKeyValue (const char *key)
| removes the value from the hash and returns the value removed, if any
Public Member Functions inherited from AbstractQoreNode
DLLEXPORT | AbstractQoreNode (qore_type_t t, bool n_value, bool n_needs_eval, bool n_there_can_be_only_one=false, bool n_custom_reference_handlers=false)
| constructor takes the type More...
DLLEXPORT | AbstractQoreNode (const AbstractQoreNode &v)
| copy constructor
virtual DLLEXPORT void | customDeref (ExceptionSink *xsink)
virtual DLLEXPORT void | customRef () const
| special processing when the object's reference count transitions from 0-1 More...
DLLEXPORT void | deref (ExceptionSink *xsink)
| decrements the reference count and calls derefImpl() if there_can_be_only_one is false, otherwise does nothing More...
DLLEXPORT QoreValue | eval (ExceptionSink *xsink) const
| evaluates the object and returns a value (or 0) More...
DLLEXPORT QoreValue | eval (bool &needs_deref, ExceptionSink *xsink) const
| optionally evaluates the argument More...
DLLEXPORT int64 | getAsBigInt () const
| returns the 64-bit integer value of the object More...
virtual DLLLOCAL int64 | getAsBigIntImpl () const
| default implementation, returns 0 More...
DLLEXPORT bool | getAsBool () const
| returns the boolean value of the object More...
DLLEXPORT double | getAsFloat () const
| returns the float value of the object More...
virtual DLLLOCAL double | getAsFloatImpl () const
| default implementation, returns 0.0 More...
DLLEXPORT int | getAsInt () const
| returns the integer value of the object More...
virtual DLLLOCAL int | getAsIntImpl () const
| default implementation, returns 0 More...
virtual DLLEXPORT class DateTime * | getDateTimeRepresentation (bool &del) const
| returns the DateTime representation of this type (default implementation: returns ZeroDate, del = false) More...
virtual DLLEXPORT void | getDateTimeRepresentation (DateTime &dt) const
| assigns the date representation of a value to the DateTime reference passed, default implementation does nothing More...
virtual DLLEXPORT QoreString * | getStringRepresentation (bool &del) const
| returns the value of the type converted to a string, default implementation: returns the empty string More...
virtual DLLEXPORT void | getStringRepresentation (QoreString &str) const
| concatentates the value of the type to an existing QoreString reference, default implementation does nothing More...
DLLLOCAL qore_type_t | getType () const
| returns the data type More...
DLLLOCAL bool | is_value () const
| returns true if the node represents a value More...
DLLLOCAL bool | isReferenceCounted () const
| returns true if the object is reference-counted
DLLLOCAL bool | needs_eval () const
| returns true if the object needs evaluation to return a value, false if not More...
DLLLOCAL AbstractQoreNode & | operator= (const AbstractQoreNode &)
| this function is not implemented; it is here as a private function in order to prohibit it from being used
DLLEXPORT void | ref () const
| increments the reference count
DLLEXPORT AbstractQoreNode * | refSelf () const
| returns "this" with an incremented reference count More...
Public Member Functions inherited from QoreReferenceCounter
DLLEXPORT | QoreReferenceCounter ()
| creates the reference counter object
DLLEXPORT | QoreReferenceCounter (const QoreReferenceCounter &old)
| creates a new object with a reference count of 1 More...
DLLEXPORT | ~QoreReferenceCounter ()
| destroys the reference counter object
DLLEXPORT bool | is_unique () const
| returns true if the reference count is 1 More...
DLLEXPORT int | reference_count () const
| gets the reference count More...
DLLEXPORT bool | ROdereference () const
| atomically decrements the reference count More...
DLLEXPORT void | ROreference () const
| atomically increments the reference count

## Static Public Member Functions

static DLLLOCAL qore_type_t | getStaticTypeCode ()
| returns the type code (useful in templates)
static DLLLOCAL const char * | getStaticTypeName ()
| returns the type name (useful in templates) More...

## Protected Member Functions

virtual DLLEXPORT | ~QoreHashNode ()
| deletes the object, cannot be called directly (use deref(ExceptionSink*) instead) More...
virtual DLLEXPORT bool | derefImpl (ExceptionSink *xsink)
| dereferences all elements of the hash More...
virtual DLLLOCAL QoreValue | evalImpl (bool &needs_deref, ExceptionSink *xsink) const
| optionally evaluates the argument More...
Protected Member Functions inherited from AbstractQoreNode
virtual DLLEXPORT | ~AbstractQoreNode ()
| default destructor does nothing More...

## Protected Attributes

class qore_hash_private * | priv
| private implementation of the class
Protected Attributes inherited from AbstractQoreNode
bool | custom_reference_handlers: 1
| set to one for objects that need custom reference handlers
bool | needs_eval_flag: 1
| if this is true then the type can be evaluated
bool | there_can_be_only_one: 1
| if this is set to true, then reference counting is turned off for objects of this class
qore_type_t | type: 11
| the type of the object More...
bool | value: 1
| this is true for values, if false then either the type needs evaluation to produce a value or is a parse expression

## Friends

class | ConstHashIterator
class | HashAssignmentHelper
class | HashIterator
class | ReverseConstHashIterator
class | ReverseHashIterator

## Detailed Description

This is the hash or associative list container type in Qore, dynamically allocated only, reference counted.

it is both a value type and can hold parse expressions as well (in which case it needs to be evaluated) This type also maintains the insertion order as well as offering a hash-based lookup of string keys. The insertion order of keys is maintained in order to support consistent serialization and deserialization to and from XML, JSON, YAML, etc

## Constructor & Destructor Documentation

## ~QoreHashNode()

virtual DLLEXPORT QoreHashNode::~QoreHashNode | ( |  | ) |

protected virtual

deletes the object, cannot be called directly (use deref(ExceptionSink*) instead)

See also
  AbstractQoreNode::deref()
  QoreHashNode::derefImpl()

## QoreHashNode() [1/2]

DLLEXPORT QoreHashNode::QoreHashNode | ( | const TypedHashDecl * | hd,
|  | ExceptionSink * | xsink
| ) |  |

creates a hash of the specific type; the hash is initialized according to the hashdecl declaration

Since
  Qore 0.8.13

## QoreHashNode() [2/2]

DLLEXPORT QoreHashNode::QoreHashNode | ( | const QoreTypeInfo * | valueTypeInfo | ) |

creates an empty hash with the specific value type

Since
  Qore 0.8.13

## Member Function Documentation

## compareHard()

DLLEXPORT bool QoreHashNode::compareHard | ( | const QoreHashNode * | h,
|  | ExceptionSink * | xsink
| ) |  | const

does a deep "hard" compare of all hash elements (no type conversions are performed) and returns true if the hashes are equal

Note
  that if the hashes have a different number of keys then the comparison fails immediately

Returns
  true if the hashes have the same number and values of keys and all elements are equal and of the same type (no type conversions are performed)

## compareSoft()

DLLEXPORT bool QoreHashNode::compareSoft | ( | const QoreHashNode * | h,
|  | ExceptionSink * | xsink
| ) |  | const

does a deep "soft" compare of all hash elements (types may be converted for the comparison) and returns true if the hashes are equal

Note
  that if the hashes have a different number or names of keys then the comparison fails immediately

Returns
  true if the hashes have the same number and names of keys and all elements are equal (types may be converted for the comparison)

## copy()

DLLEXPORT QoreHashNode* QoreHashNode::copy | ( |  | ) | const

performs a copy of the hash and returns the new hash

Returns
  a copy of the current QoreHashNode

## deleteKey() [1/2]

DLLEXPORT void QoreHashNode::deleteKey | ( | const QoreString * | key,
|  | ExceptionSink * | xsink
| ) |  |

performs a delete operation on the value of the given key

The delete operation means a simple dereference for all types except QoreObject, on this type the destructor will be run immediately. A Qore-language exception could occur eitherin converting the key string's encoding to QCS_DEFAULT, or in the destructor of a deleted object.

Parameters

  key | the key of the value to delete
  xsink | if an error occurs, the Qore-language exception information will be added here

## deleteKey() [2/2]

DLLEXPORT void QoreHashNode::deleteKey | ( | const char * | key,
|  | ExceptionSink * | xsink
| ) |  |

performs a delete operation on the value of the given key

the delete operation means a simple dereference for all types except QoreObject, on this type the destructor will be run immediately

Parameters

  key | the key of the value to delete
  xsink | if an error occurs, the Qore-language exception information will be added here

## derefImpl()

virtual DLLEXPORT bool QoreHashNode::derefImpl | ( | ExceptionSink * | xsink | ) |

protected virtual

dereferences all elements of the hash

The ExceptionSink argument is needed for those types that could throw an exception when they are deleted (ex: QoreObject) - which could be contained in the hash

Parameters

  xsink | if an error occurs, the Qore-language exception information will be added here

Returns
  true if the object can be deleted, false if not (externally-managed)

Reimplemented from AbstractQoreNode.

## empty()

DLLEXPORT bool QoreHashNode::empty | ( |  | ) | const

returns true if the hash has no members, false if not

Returns
  true if the hash has no members, false if not

## evalImpl()

virtual DLLLOCAL QoreValue QoreHashNode::evalImpl | ( | bool & | needs_deref,
|  | ExceptionSink * | xsink
| ) |  | const

protected virtual

optionally evaluates the argument

return value requires a deref(xsink) if needs_deref is true

See also
  AbstractQoreNode::eval()

Implements AbstractQoreNode.

## existsKey()

DLLEXPORT bool QoreHashNode::existsKey | ( | const char * | key | ) | const

returns true if the hash contains the given key

Note
  that if this returns true, it does not mean the key has a value; it just means that the hash contains the key; the key's value could be NOTHING

Parameters

  key | the key name to check, must be in default encoding QCS_DEFAULT

Returns
  true if the hash contains the given key

## existsKeyValue()

DLLEXPORT bool QoreHashNode::existsKeyValue | ( | const char * | key | ) | const

returns true if the hash contains the given key and the key has a value (i.e. is not NOTHING)

Parameters

  key | the key name to check, must be in default encoding QCS_DEFAULT

Returns
  true if the hash contains the given key and the key has a value

## getAsBoolImpl()

virtual DLLEXPORT bool QoreHashNode::getAsBoolImpl | ( |  | ) | const

virtual

returns false unless perl-boolean-evaluation is enabled, in which case it returns false only when empty

Returns
  false unless perl-boolean-evaluation is enabled, in which case it returns false only when empty

Reimplemented from AbstractQoreNode.

## getAsString() [1/2]

virtual DLLEXPORT int QoreHashNode::getAsString | ( | QoreString & | str,
|  | int | foff,
|  | ExceptionSink * | xsink
| ) |  | const

virtual

concatenate the verbose string representation of the list (including all contained values) to an existing QoreString

used for n and N printf formatting

Parameters

  str | the string representation of the type will be concatenated to this QoreString reference
  foff | for multi-line formatting offset, -1 = no line breaks
  xsink | if an error occurs, the Qore-language exception information will be added here

Returns
  -1 for exception raised, 0 = OK

Implements AbstractQoreNode.

## getAsString() [2/2]

virtual DLLEXPORT QoreString* QoreHashNode::getAsString | ( | bool & | del,
|  | int | foff,
|  | ExceptionSink * | xsink
| ) |  | const

virtual

returns a QoreString giving the verbose string representation of the List (including all contained values)

used for n and N printf formatting

Parameters

  del | if this is true when the function returns, then the returned QoreString pointer should be deleted, if false, then it must not be
  foff | for multi-line formatting offset, -1 = no line breaks
  xsink | if an error occurs, the Qore-language exception information will be added here NOTE: Use the QoreNodeAsStringHelper class (defined in QoreStringNode.h) instead of using this function directly

See also
  QoreNodeAsStringHelper

Implements AbstractQoreNode.

## getFirstKey()

DLLEXPORT const char* QoreHashNode::getFirstKey | ( |  | ) | const

returns the cstring value of the first key in the hash

Returns
  the cstring value of the first key in the hash

## getHashDecl()

DLLEXPORT const TypedHashDecl* QoreHashNode::getHashDecl | ( |  | ) | const

returns the hash's type declaration, if any

Since
  Qore 0.8.13

## getKeyAsBigInt()

DLLEXPORT int64 QoreHashNode::getKeyAsBigInt | ( | const char * | key,
|  | bool & | found
| ) |  | const

returns the value of the key as an int64

Parameters

  key | the key to return the value for
  found | returns as true if the key exists, false if not

Returns
  the value of the key as an int64

Deprecated:
  use getKeyValue() instead

## getKeyAsBool()

DLLEXPORT bool QoreHashNode::getKeyAsBool | ( | const char * | key,
|  | bool & | found
| ) |  | const

returns the value of the key as a bool

Parameters

  key | the key to return the value for
  found | returns as true if the key exists, false if not

Returns
  the value of the key as a bool

Deprecated:
  use getKeyValue() instead

## getKeys()

DLLEXPORT QoreListNode* QoreHashNode::getKeys | ( |  | ) | const

returns a QoreListNode of QoreStringNode pointers representing all keys in the hash, caller owns the reference count returned

to iterate through a hash, use HashIterator, ReverseHashIterator, ConstHashIterator, or ReverseConstHashIterator

Returns
  a QoreListNode of QoreStringNode pointers representing all keys in the hash, caller owns the reference count returned

## getKeyValue() [1/3]

DLLEXPORT QoreValue QoreHashNode::getKeyValue | ( | const char * | key,
|  | ExceptionSink * | xsink
| ) |  | const

returns the value of the given key

Parameters

  key | the key to return
  xsink | Qore language exceptions are raised here (ex: key is not valid for a hashdecl-derived hash)

Since
  Qore 0.8.13

## getKeyValue() [2/3]

DLLEXPORT QoreValue QoreHashNode::getKeyValue | ( | const char * | key | ) | const

returns the value of the given key

Parameters

  key | the key to return

Since
  Qore 0.8.13

## getKeyValue() [3/3]

DLLEXPORT QoreValue QoreHashNode::getKeyValue | ( | const QoreString & | key,
|  | ExceptionSink * | xsink
| ) |  | const

returns the value of the given key

Parameters

  key | the key to return
  xsink | Qore language exceptions are raised here (ex: key is not valid for a hashdecl-derived hash)

Since
  Qore 0.8.13

## getKeyValueExistence() [1/4]

DLLEXPORT QoreValue QoreHashNode::getKeyValueExistence | ( | const char * | key,
|  | bool & | exists,
|  | ExceptionSink * | xsink
| ) |  | const

returns the value of the given key

Parameters

  key | the key to return
  exists | true if the key existed (in case no value is returned), false if not
  xsink | Qore language exceptions are raised here (ex: key is not valid for a hashdecl-derived hash)

Since
  Qore 0.8.13

## getKeyValueExistence() [2/4]

DLLEXPORT QoreValue QoreHashNode::getKeyValueExistence | ( | const char * | key,
|  | bool & | exists
| ) |  | const

returns the value of the given key

Parameters

  key | the key to return
  exists | true if the key existed (in case no value is returned), false if not

Since
  Qore 0.8.13

## getKeyValueExistence() [3/4]

DLLEXPORT QoreValue QoreHashNode::getKeyValueExistence | ( | const QoreString & | key,
|  | bool & | exists,
|  | ExceptionSink * | xsink
| ) |  | const

returns the value of the given key

Parameters

  key | the key to return
  exists | true if the key existed (in case no value is returned), false if not
  xsink | Qore language exceptions are raised here (ex: key is not valid for a hashdecl-derived hash)

Since
  Qore 0.8.13

## getKeyValueExistence() [4/4]

DLLEXPORT QoreValue QoreHashNode::getKeyValueExistence | ( | const QoreString & | key,
|  | bool & | exists
| ) |  | const

returns the value of the given key

Parameters

  key | the key to return
  exists | true if the key existed (in case no value is returned), false if not

Since
  Qore 0.8.13

## getLastKey()

DLLEXPORT const char* QoreHashNode::getLastKey | ( |  | ) | const

returns the cstring value of the last key in the hash

Returns
  the cstring value of the last key in the hash

## getStaticTypeName()

static DLLLOCAL const char* QoreHashNode::getStaticTypeName | ( |  | ) |

inline static

returns the type name (useful in templates)

Returns
  the type name

## getTypeInfo()

DLLEXPORT const QoreTypeInfo* QoreHashNode::getTypeInfo | ( |  | ) | const

returns the type info structure for the current value; also works for hashes derived from a TypedHashDecl or with a specific value type

Since
  Qore 0.8.13

## getTypeName()

virtual DLLEXPORT const char* QoreHashNode::getTypeName | ( |  | ) | const

virtual

returns the type name as a c string

Returns
  the type name as a c string

Implements AbstractQoreNode.

## getValues()

DLLEXPORT QoreListNode* QoreHashNode::getValues | ( |  | ) | const

returns a QoreListNode of AbstractQoreNode pointers representing all values in the hash; caller owns the reference count returned

to iterate through a hash, use HashIterator, ReverseHashIterator, ConstHashIterator, or ReverseConstHashIterator

Returns
  a QoreListNode of AbstractQoreNode pointers representing all values in the hash; caller owns the reference count returned

Since
  Qore 0.8.13

## getValueTypeInfo()

DLLEXPORT const QoreTypeInfo* QoreHashNode::getValueTypeInfo | ( |  | ) | const

returns the value type declaration (only possible if there is no hashdecl set)

Since
  Qore 0.8.13

## hashRefSelf()

DLLEXPORT QoreHashNode* QoreHashNode::hashRefSelf | ( |  | ) | const

returns "this" with an incremented reference count

Returns
  "this" with an incremented reference count

## is_equal_hard()

virtual DLLEXPORT bool QoreHashNode::is_equal_hard | ( | const AbstractQoreNode * | v,
|  | ExceptionSink * | xsink
| ) |  | const

virtual

tests for equality ("deep compare" including all contained values) without type conversions (hard compare)

Parameters

  v | the value to compare
  xsink | if an error occurs, the Qore-language exception information will be added here

Implements AbstractQoreNode.

## is_equal_soft()

virtual DLLEXPORT bool QoreHashNode::is_equal_soft | ( | const AbstractQoreNode * | v,
|  | ExceptionSink * | xsink
| ) |  | const

virtual

tests for equality ("deep compare" including all contained values) with possible type conversion (soft compare)

Parameters

  v | the value to compare
  xsink | if an error occurs, the Qore-language exception information will be added here

Implements AbstractQoreNode.

## merge()

DLLEXPORT void QoreHashNode::merge | ( | const QoreHashNode * | h,
|  | ExceptionSink * | xsink
| ) |  |

appends all key-value pairs of "h" to this hash

Note that all keys and values of the QoreHashNode "h" are copied to this hash, values are referenced as necessary for the assigment to "this". Qore-language exceptions could be thrown if the hash keys in "this" are overwritten with new values and the old value is an object that goes out of scope when dereferenced.

Parameters

  h | the QoreHashNode to use to merge all keys to "this"
  xsink | if an error occurs, the Qore-language exception information will be added here

## realCopy()

virtual DLLEXPORT AbstractQoreNode* QoreHashNode::realCopy | ( |  | ) | const

virtual

performs a copy of the hash and returns the new hash

Returns
  a copy of the QoreHashNode

Implements AbstractQoreNode.

## removeKey() [1/2]

DLLEXPORT void QoreHashNode::removeKey | ( | const QoreString * | key,
|  | ExceptionSink * | xsink
| ) |  |

removes the given key from the hash and derefences its value, if any

A Qore-language exception could occur either in converting the key string's encoding to QCS_DEFAULT, or when dereferencing the contained value

Parameters

  key | the key of the value to delete
  xsink | if an error occurs, the Qore-language exception information will be added here

## removeKey() [2/2]

DLLEXPORT void QoreHashNode::removeKey | ( | const char * | key,
|  | ExceptionSink * | xsink
| ) |  |

removes the given key from the hash and derefences its value, if any

A Qore-language exception could occur when dereferencing the contained value

Parameters

  key | the key of the value to delete, must be in QCS_DEFAULT encoding
  xsink | if an error occurs, the Qore-language exception information will be added here

## setKeyValue() [1/2]

DLLEXPORT int QoreHashNode::setKeyValue | ( | const char * | key,
|  | QoreValue | value,
|  | ExceptionSink * | xsink
| ) |  |

sets the value of "key" to "value"

A Qore-language exception could be thrown if the hash is derived from a hashdecl and the key is unknown, or if the given key has a current value and it's a QoreObject that goes out of scope when dereferenced (the object's destructor could throw an exception); if an exception is thrown due to encoding conversion issues (and therefore the assignment is not made) then the value to be assigned is dereferenced automatically

Parameters

  key | the key to set the value for
  value | the value to assign to the key, must be already referenced for the assignment
  xsink | if an error occurs, the Qore-language exception information will be added here

Returns
  0 for OK, -1 if a Qore-language exception was thrown

Note
  the assignment is made even if an exception occurs when dereferencing the old value

Since
  Qore 0.8.13

## setKeyValue() [2/2]

DLLEXPORT int QoreHashNode::setKeyValue | ( | const QoreString & | key,
|  | QoreValue | value,
|  | ExceptionSink * | xsink
| ) |  |

sets the value of "key" to "value"

A Qore-language exception could be thrown if the hash is derived from a hashdecl and the key is unknown, or converting the key string's encoding to QCS_DEFAULT, or if the given key has a current value and it's a QoreObject that goes out of scope when dereferenced (the object's destructor could throw an exception); if an exception is thrown due to encoding conversion issues (and therefore the assignment is not made) then the value to be assigned is dereferenced automatically

Parameters

  key | the key to set the value for
  value | the value to assign to the key, must be already referenced for the assignment
  xsink | if an error occurs, the Qore-language exception information will be added here

Returns
  0 for OK, -1 if a Qore-language exception was thrown

Note
  the assignment is made even if an exception occurs when dereferencing the old value

Since
  Qore 0.8.13

## size()

DLLEXPORT size_t QoreHashNode::size | ( |  | ) | const

returns the number of members in the hash, executes in constant time

Returns
  the number of members in the hash

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

- include/qore/QoreHashNode.h