Builtin functions (and methods) can be tagged with flags that give some properties of the code to be executed as in the following sections.

NOOP

Code with this flag makes no calculations, but rather returns a constant value. This flag is given to function and method variants that return a default value depending on the type of argument(s). When variants with this flag are resolved at parse time, a call-with-type-errors warning is raised (assuming this warning is enabled).

RUNTIME_NOOP

Code with this flag makes no calculations, but rather returns a constant value. This flag is given to function and method variants that return a default value depending on the type of argument(s). When variants with this flag are resolved at parse time, a call-with-type-errors warning is raised (assuming this warning is enabled), unless Qore::PO_REQUIRE_TYPES or Qore::PO_STRICT_ARGS is set. If either Qore::PO_REQUIRE_TYPES or Qore::PO_STRICT_ARGS is set, then these variants are inaccessible; resolving to a variant with this flag set at parse time or run time causes an exception to be thrown. These variants are included for backwards-compatibility with qore prior to version 0.8.0 for functions that would ignore type errors in arguments.

CONSTANT

This flag indicates that the function or method has no side effects and does not throw any exceptions (see also RET_VALUE_ONLY).

RET_VALUE_ONLY

This flag indicates that the function or method has no side effects but could throw an exception (see also CONSTANT).

DEPRECATED

Code with this flag is deprecated and may be removed in a future version of Qore; if a variant with this flag is resolved at parse time, a "Deprecated" Functions warning is raised (assuming this warning is enabled).