diff options
| -rw-r--r-- | txr.1 | 26 |
1 files changed, 16 insertions, 10 deletions
@@ -17867,7 +17867,11 @@ Although structures can have methods and functions in their instances, usually, all structures of the same type share the same functions. The .code defstruct macro supports a special syntax for defining methods and struct-specific -functions. +functions at the same time when a new structure type is defined. +The +.code defmeth +macro can be used for adding new methods and functions to an existing +structure and its descendants. Static slots may be assigned just like instance slots. Changing a static slot, of course, changes that slot in every structure of the same type. @@ -18027,13 +18031,13 @@ may be used to terminate the execution of the function and return a value. Such functions are called using the .code instance.[name arg ...] -syntax which doesn't insert the instance name into +syntax which doesn't insert the instance into the argument list. .meIP (:init <> ( param ) << body-form *) The .code :init -descriptor doesn't describe a slot. Rather, it specifies code +specifier doesn't describe a slot. Rather, it specifies code which is executed when a structure is instantiated, after the slot initializations specific to the structure type are performed. The code consists of @@ -18077,7 +18081,7 @@ specifier are not surrounded by an implicit .meIP (:fini <> ( param ) << body-form *) The .code :fini -descriptor doesn't describe a slot. Rather, it specifies +specifier doesn't describe a slot. Rather, it specifies a finalization function which is associated with the structure instance, as if by use of the .code finalize @@ -18106,11 +18110,12 @@ of a .code :fini specifier are not surrounded by an implicit .codn block . -.RE -.PP Note that an object's finalizers can be called explicitly with .codn call-finalizers . +.RE +.PP + The .code with-objects macro arranges for finalizers to be called on objects when the execution @@ -18182,15 +18187,16 @@ A slot initialized in this style still has a which is processed independently of the existence of, and prior to, boa construction. -The boa constructor syntax can specify optional arguments, delimited +The boa constructor syntax can specify optional parameters, delimited by a colon, similarly to the .code lambda -syntax. However, the optional arguments may only be symbols which name -slots. The +syntax. However, the optional parameters may not be arbitrary symbols; +they must be symbols which name +slots. Moreover, the .cblk .meti >> ( name < init-form <> [ present-p ]) .cble -optional argument syntax isn't supported. +optional parameter syntax isn't supported. When boa construction is invoked with optional arguments missing, the default values for those arguments come from the |