/[guile]/guile/guile-core/doc/ref/scheme-utility.texi
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revision 1.9 by kryde, Wed Jun 11 22:49:21 2003 UTC revision 1.10 by kryde, Mon Jul 28 23:27:03 2003 UTC
# Line 147  protected by the table. Line 147  protected by the table.
147  @node Property Primitives  @node Property Primitives
148  @subsection Low Level Property Implementation.  @subsection Low Level Property Implementation.
149    
150  @deffn {Scheme Procedure} primitive-make-property not_found_proc  @deffn {Scheme Procedure} primitive-make-property not-found-proc
151  @deffnx {C Function} scm_primitive_make_property (not_found_proc)  @deffnx {C Function} scm_primitive_make_property (not_found_proc)
152  Create a @dfn{property token} that can be used with  Create a @dfn{property token} that can be used with
153  @code{primitive-property-ref} and @code{primitive-property-set!}.  @code{primitive-property-ref} and @code{primitive-property-set!}.
154  See @code{primitive-property-ref} for the significance of  See @code{primitive-property-ref} for the significance of
155  @var{not_found_proc}.  @var{not-found-proc}.
156  @end deffn  @end deffn
157    
158  @deffn {Scheme Procedure} primitive-property-ref prop obj  @deffn {Scheme Procedure} primitive-property-ref prop obj
159  @deffnx {C Function} scm_primitive_property_ref (prop, obj)  @deffnx {C Function} scm_primitive_property_ref (prop, obj)
160  Return the property @var{prop} of @var{obj}.  When no value  Return the property @var{prop} of @var{obj}.
161  has yet been associated with @var{prop} and @var{obj}, call  
162  @var{not-found-proc} instead (see @code{primitive-make-property})  When no value has yet been associated with @var{prop} and @var{obj},
163  and use its return value.  That value is also associated with  the @var{not-found-proc} from @var{prop} is used.  A call
164  @var{obj} via @code{primitive-property-set!}.  When  @code{(@var{not-found-proc} @var{prop} @var{obj})} is made and the
165  @var{not-found-proc} is @code{#f}, use @code{#f} as the  result set as the property value.  If @var{not-found-proc} is
166  default value of @var{prop}.  @code{#f} then @code{#f} is the property value.
167  @end deffn  @end deffn
168    
169  @deffn {Scheme Procedure} primitive-property-set! prop obj val  @deffn {Scheme Procedure} primitive-property-set! prop obj val
170  @deffnx {C Function} scm_primitive_property_set_x (prop, obj, val)  @deffnx {C Function} scm_primitive_property_set_x (prop, obj, val)
171  Associate @var{code} with @var{prop} and @var{obj}.  Set the property @var{prop} of @var{obj} to @var{val}.
172  @end deffn  @end deffn
173    
174  @deffn {Scheme Procedure} primitive-property-del! prop obj  @deffn {Scheme Procedure} primitive-property-del! prop obj

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