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Qore Programming Language
0.8.11.1
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Qore's SQL "NULL" parse tree/value type, not-referenced counted, not dynamically allocated. More...
#include <QoreNullNode.h>
Public Member Functions | |
| virtual DLLEXPORT int | getAsString (QoreString &str, int foff, class ExceptionSink *xsink) const |
| concatenate "<NULL>" to an existing QoreString More... | |
| virtual DLLEXPORT QoreString * | getAsString (bool &del, int foff, class ExceptionSink *xsink) const |
| returns a QoreString with the text: "<NULL>" More... | |
| virtual DLLEXPORT const char * | getTypeName () const |
| returns the type name as a c string | |
| virtual DLLEXPORT bool | is_equal_hard (const AbstractQoreNode *v, ExceptionSink *xsink) const |
| tests for equality without type conversions (hard compare) More... | |
| virtual DLLEXPORT bool | is_equal_soft (const AbstractQoreNode *v, ExceptionSink *xsink) const |
| tests for equality with possible type conversion (soft compare) More... | |
| virtual DLLLOCAL AbstractQoreNode * | parseInit (LocalVar *oflag, int pflag, int &lvids, const QoreTypeInfo *&typeInfo) |
| returns the type information | |
 Public Member Functions inherited from UniqueValueQoreNode | |
| DLLLOCAL | UniqueValueQoreNode (qore_type_t t) |
| constructor takes the type argument | |
| DLLLOCAL | UniqueValueQoreNode (const UniqueValueQoreNode &) |
| copy constructor | |
| virtual DLLEXPORT AbstractQoreNode * | realCopy () const |
| returns itself; objects of this type are not reference-counted and only deleted manually (by static destruction) | |
| Public Member Functions inherited from SimpleValueQoreNode | |
| DLLLOCAL | SimpleValueQoreNode (qore_type_t t, bool n_there_can_be_only_one=false) |
| creates the object by assigning the type code and setting the "value" flag, unsetting the "needs_eval" flag, and setting "there_can_be_only_one" | |
| Public Member Functions inherited from SimpleQoreNode | |
| DLLLOCAL | SimpleQoreNode (qore_type_t t, bool n_value, bool n_needs_eval, bool n_there_can_be_only_one=false) |
| constructor takes the type and value arguments | |
| DLLLOCAL | SimpleQoreNode (const SimpleQoreNode &v) |
| copy constructor | |
| 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 | |
| DLLEXPORT int64 | bigIntEval (ExceptionSink *xsink) const |
| evaluates the object and returns a 64-bit integer value More... | |
| DLLEXPORT bool | boolEval (ExceptionSink *xsink) const |
| evaluates the object and returns a boolean value 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 AbstractQoreNode * | eval (ExceptionSink *xsink) const |
| evaluates the object and returns a value (or 0) More... | |
| DLLEXPORT AbstractQoreNode * | eval (bool &needs_deref, ExceptionSink *xsink) const |
| optionally evaluates the argument More... | |
| DLLEXPORT double | floatEval (ExceptionSink *xsink) const |
| evaluates the object and returns a floating-point value More... | |
| DLLEXPORT int64 | getAsBigInt () const |
| returns the 64-bit integer value of the object 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... | |
| DLLEXPORT int | getAsInt () const |
| returns the integer value of the object 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... | |
| DLLEXPORT int | integerEval (ExceptionSink *xsink) const |
| evaluates the object and returns an integer value 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... | |
| 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 () |
| destroys the reference counter object | |
| DLLLOCAL bool | is_unique () const |
| returns true if the reference count is 1 More... | |
| DLLLOCAL 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) | |
Protected Member Functions | |
| DLLLOCAL AbstractQoreNode * | evalImpl (class ExceptionSink *xsink) const |
| should never be called for value types More... | |
| Protected Member Functions inherited from SimpleValueQoreNode | |
| virtual DLLEXPORT int64 | bigIntEvalImpl (ExceptionSink *xsink) const |
| should never be called for value types More... | |
| virtual DLLEXPORT bool | boolEvalImpl (ExceptionSink *xsink) const |
| should never be called for value types More... | |
| virtual DLLEXPORT AbstractQoreNode * | evalImpl (bool &needs_deref, ExceptionSink *xsink) const |
| should never be called for value types More... | |
| virtual DLLEXPORT double | floatEvalImpl (ExceptionSink *xsink) const |
| should never be called for value types More... | |
| virtual DLLEXPORT int | integerEvalImpl (ExceptionSink *xsink) const |
| should never be called for value types More... | |
| Protected Member Functions inherited from AbstractQoreNode | |
| virtual DLLEXPORT | ~AbstractQoreNode () |
| default destructor does nothing More... | |
Additional Inherited Members | |
| 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 | |
| Protected Attributes inherited from QoreReferenceCounter | |
| QoreThreadLock | mRO |
| pthread lock to ensure atomicity of updates for architectures where we don't have an atomic increment and decrement implementation | |
Qore's SQL "NULL" parse tree/value type, not-referenced counted, not dynamically allocated.
This class cannot be instantiated; there will only be one single QoreNullNode object instantiated and used everywhere in the Qore library; use the null() function or simply &Null to acquire a pointer to an object of this class. This value can be represented in Qore code as the keyword "NULL". NOTE: Qore's "NULL" is not equal to "NOTHING"
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protectedvirtual |
should never be called for value types
in debugging builds of the library, calls to this function will abort
Reimplemented from SimpleValueQoreNode.
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virtual |
concatenate "<NULL>" to an existing QoreString
used for n and N printf formatting
| 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 |
Implements AbstractQoreNode.
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virtual |
returns a QoreString with the text: "<NULL>"
used for n and N printf formatting
| del | is always set to true for this implementation of the function, meaning that the returned QoreString pointer should be deleted |
| foff | for multi-line formatting offset, -1 = no line breaks (ignored by this version of the function) |
| xsink | ignored by this version of the function NOTE: Use the QoreNodeAsStringHelper class (defined in QoreStringNode.h) instead of using this function directly |
Implements AbstractQoreNode.
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virtual |
tests for equality without type conversions (hard compare)
| v | the value to compare |
| xsink | ignored for this version of the function |
Implements AbstractQoreNode.
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virtual |
tests for equality with possible type conversion (soft compare)
since no type can be implicitly converted to a NULL, this comparison is the same as is_equal_hard() for QoreNullNode
| v | the value to compare |
| xsink | ignored for this version of the function |
Implements AbstractQoreNode.
