struct CrlValueBox / crl_value_box_t

Description

This is a box that contains another value. It cannot be stored or loaded in CRL, instead, the value contained will be stored and read. This is handy for attributes of which you do not know the value when creating the CRL structure for it: simply put a ValueBox with NULL there and replace the NULL by the value you want later. For convenience, the box may be given a name().

Access is transparent: all next_index(), nth(), etc. stuff is passed to the child. set_nth requests will create a new ValueVector on the fly if the box still contains NULL. Similarly, set_sym will generate a new ValueMap on the fly.

A related set of classes, CrlValueRef, implements an lvalue, while this is like an SML reference/pointer.

Kinship

Immediate super class: Value

Slots

Inherited Slots

Members

Inherited Members

Detailed Descriptions

symbol_t name () const

Reader of slot 'name': The name of this box.

To write this slot, use set_name().

This reader must not be invoked with this == NULL.

void set_name (symbol_t)

Writer of slot 'name': The name of this box.

To read this slot, use set_name().

This writer must not be invoked with this == NULL.

Value * child () const

Reader of slot 'child': The child of this box.

To write this slot, use set_child()/reset_child().

This reader is NULL safe; for this == NULL, it returns NULL.

void set_child (Value *)

Writer of slot 'child': The child of this box.

To read this slot, use child().

This writer must not be invoked with this == NULL.

void reset_child ()

NULL writer of slot 'child': The child of this box.

To read this slot, use child().

This writer must not be invoked with this == NULL.

[constructor] CrlValueBox ()