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Qore Programming Language Reference Manual
0.8.10
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Methods in this pseudo-class are available to be executed on any value type (even NOTHING); this is the root class for all pseudo-classes. More...

Public Member Functions | |
| bool | callp () |
| Returns False; this method is reimplemented in other types and will return True if the given expression is a callable value (ie closures or call references) More... | |
| bool | empty () |
| Returns True; this method will be reimplemented in container types where it may return False. More... | |
| bool | intp () |
| Returns False; this method is reimplemented in other types and will return True if the given expression can be converted to an integer. More... | |
| AbstractIterator | iterator () |
| Returns an iterator object for the value; the default iterator object returned is SingleValueIterator. More... | |
| int | lsize () |
| Returns 1; the return value of this method should give the list size of the value, which is normally 1 for non-lists (except for NOTHING where the size will be 0) and the number of the elements in the list for lists; this method will be reimplemented in other types where it may return other values. More... | |
| int | size () |
| Returns zero; this method will be reimplemented in container types where it may return a non-zero value. More... | |
| bool | sizep () |
| Returns True if the type can return a non-zero size (True for containers including binary objects and strings, False for everything else) More... | |
| bool | strp () |
| Returns False; this method is reimplemented in other types and will return True if the given expression can be converted to a string. More... | |
| bool | toBool () |
| Returns the boolean representation of the value; the default is False. More... | |
| float | toFloat () |
| Returns the floating-point representation of the value; the default is 0.0. More... | |
| int | toInt () |
| Returns the integer representation of the value; the default is 0. More... | |
| number | toNumber () |
| Returns the arbitrary-precision numeric representation of the value; the default is 0. More... | |
| string | toString () |
| Returns the string representation of the value; the default is an empty string. More... | |
| string | type () |
| Returns the string type for the value. More... | |
| int | typeCode () |
| Returns the type code for the value. More... | |
| bool | val () |
| Returns False; this method is reimplemented in other types and will return True if the given expression has a value that would be converted to True according to the rules described in %perl-bool-eval. More... | |
Methods in this pseudo-class are available to be executed on any value type (even NOTHING); this is the root class for all pseudo-classes.
| bool <value>::callp | ( | ) |
Returns False; this method is reimplemented in other types and will return True if the given expression is a callable value (ie closures or call references)
| bool <value>::empty | ( | ) |
Returns True; this method will be reimplemented in container types where it may return False.
This pseudo-method will return False in all non-container types; use <value>::val() to check if a generic expression that might not be a container type has a value instead.
| bool <value>::intp | ( | ) |
Returns False; this method is reimplemented in other types and will return True if the given expression can be converted to an integer.
| AbstractIterator <value>::iterator | ( | ) |
Returns an iterator object for the value; the default iterator object returned is SingleValueIterator.
| int <value>::lsize | ( | ) |
Returns 1; the return value of this method should give the list size of the value, which is normally 1 for non-lists (except for NOTHING where the size will be 0) and the number of the elements in the list for lists; this method will be reimplemented in other types where it may return other values.
| int <value>::size | ( | ) |
Returns zero; this method will be reimplemented in container types where it may return a non-zero value.
This pseudo-method will return 0 in all non-container types; use <value>::val() to check if a generic expression that might not be a container type has a value instead.
| bool <value>::sizep | ( | ) |
Returns True if the type can return a non-zero size (True for containers including binary objects and strings, False for everything else)
| bool <value>::strp | ( | ) |
Returns False; this method is reimplemented in other types and will return True if the given expression can be converted to a string.
| bool <value>::toBool | ( | ) |
Returns the boolean representation of the value; the default is False.
| float <value>::toFloat | ( | ) |
Returns the floating-point representation of the value; the default is 0.0.
| int <value>::toInt | ( | ) |
Returns the integer representation of the value; the default is 0.
Use <value>::intp() to determine if the current value can be converted to an integer
| number <value>::toNumber | ( | ) |
Returns the arbitrary-precision numeric representation of the value; the default is 0.
| string <value>::toString | ( | ) |
Returns the string representation of the value; the default is an empty string.
Use <value>::strp() to determine if the current value can be converted to a string
| string <value>::type | ( | ) |
Returns the string type for the value.
| int <value>::typeCode | ( | ) |
Returns the type code for the value.
This method is recommended over <value>::type() or the type(any) or typename(any) functions for comparing data types as it is much faster and more efficient than the other alternatives (which work with string values instead of integer codes).
| bool <value>::val | ( | ) |
Returns False; this method is reimplemented in other types and will return True if the given expression has a value that would be converted to True according to the rules described in %perl-bool-eval.
This pseudo-method can be used to mimic perl's boolean evaluation when %strict-bool-eval is enabled; the return value of this method is the same as that of any value when evaluated in a boolean context when %perl-bool-eval is enabled (the default).
Prior to version 0.8.6, Qore implemented strict mathematical boolean evaluation by default (where any value must evaluate to a non-zero integer or floating-point value to be True), so this pseudo-method was implemented to provide the same functionality in qore. Note that as of qore 0.8.6, %perl-bool-eval is the default.