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sclass VStack implements Steppable { new L<Computable> stack; bool justReturned; O latestResult; transient bool justReturned_new; *() {} *(Computable computation) { push(computation); } // A is what the function returns interface Computable<A> { public void step(VStack stack, O subComputationResult); } void push(Computable computation) { stack.add(computation); } // perform a computation step. returns false iff done public bool step() { if (empty(stack)) false; O latestResult = this.latestResult; this.latestResult = null; last(stack).step(this, latestResult); justReturned = justReturned_new; justReturned_new = false; true; } // called from computation to return a value void _return(O value default null) { latestResult = value; set justReturned_new; removeLast(stack); } // called from computation to tail-call another routine void tailCall(Computable computation) { removeLast(stack); stack.add(computation); } <A> A compute(Computable<A> computation) { if (computation == null) null; push(computation); stepAll(this); ret (A) latestResult; } O result() { ret latestResult; } }
Began life as a copy of #1030376
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Snippet ID: | #1030382 |
Snippet name: | VStack - a virtual stack for reified computations [backup before NullSentinel] |
Eternal ID of this version: | #1030382/1 |
Text MD5: | 14bd2c946c66c946b9288682722b92a6 |
Transpilation MD5: | b4b746da3a2ff9897086a14c2b0de809 |
Author: | stefan |
Category: | javax |
Type: | JavaX fragment (include) |
Public (visible to everyone): | Yes |
Archived (hidden from active list): | No |
Created/modified: | 2020-12-10 14:46:58 |
Source code size: | 1291 bytes / 54 lines |
Pitched / IR pitched: | No / No |
Views / Downloads: | 180 / 233 |
Referenced in: | [show references] |