Feather StructureObj

struct command

struct <sub command> ?<arg> ...?

struct create <structure name> <list>: Creates an instance of the named structure type initialising the contents of the structure to the contents of the list. e.g.

	% set a [struct create node {root {} {}}]
	<feather::structure 0x2004e278>

struct define <structure name> <definition>: Defines a new structure type or redefines an old structure type. The definition is simply a list of member names. e.g.

	% struct define node {
	     data
	     left
	     right
	}

struct contents <structure instance>: Returns the contents of the structure as a list.

As a structure is also a container it is possible to use the generic container Feather Container commands with it. e.g.

	% struct define node {
	     data
	     left
	     right
	}
	% set a [struct create node {root {} {}}]
	<feather::structure 0x2004e278>
	% getx $a data
	root
	% setx $a left [struct create node {child1 {} {}}]
	% struct contents $a
	root {<feather::structure 0x2004ef18>} {}
	% getx $a left data
	child1

Category Data Structure