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Marius Vollmer 1997-07-27 09:04:50 +00:00
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39
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@ -14,21 +14,48 @@ Changes since Guile 1.2:
* Changes to Scheme functions and syntax
** The detection of circular references has been extended to structs.
That is, a structure that -- in the process of being printed -- prints
itself does not lead to infinite recursion.
** There is now some basic support for fluids. Please read
"libguile/fluid.h" to find out more. It is accessible from Scheme with
the following builtin procedures:
the following functions and macros:
(make-fluid)
Function: make-fluid
Create a new fluid object.
Create a new fluid object. Fluids are not special variables or
some other extension to the semantics of Scheme, but rather
ordinary Scheme objects. You can store them into variables (that
are still lexically scoped, of course) or into any other place you
like. Every fluid has a initial value of `#f'.
(fluid-ref FLUID)
(fluid-set! FLUID VAL)
Function: fluid? OBJ
Test whether OBJ is a fluid.
Function: fluid-ref FLUID
Function: fluid-set! FLUID VAL
Access/modify the fluid FLUID. Modifications are only visible
within the current dynamic root (that includes threads).
There is no `fluid-let' yet.
Function: with-fluids* FLUIDS VALUES THUNK
FLUIDS is a list of fluids and VALUES a corresponding list of
values for these fluids. Before THUNK gets called the values are
installed in the fluids and the old values of the fluids are
saved in the VALUES list. When the flow of control leaves THUNK
or reenters it, the values get swapped again. You might think of
this as a `safe-fluid-excursion'. Note that the VALUES list is
modified by `with-fluids*'.
Macro: with-fluids ((FLUID VALUE) ...) FORM ...
The same as `with-fluids*' but with a different syntax. It looks
just like `let', but both FLUID and VALUE are evaluated. Remember,
fluids are not special variables but ordinary objects. FLUID
should evaluate to a fluid.
* Changes to system call interfaces: