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Peter
2023-11-01 09:29:33 +01:00
parent 448147e7da
commit d6c745207b
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30
IBAF-cbs/Funcons-beta/Values/Abstraction/Thunks/Thunks.cbs Normal file
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### Thunks
[
Datatype thunks
Funcon thunk
Funcon force
]
Meta-variables
T <: values
Datatype
thunks(T) ::= thunk(_:abstractions(()=>T))
/*
`thunks(T)` consists of abstractions whose bodies do not depend on
a given value, and whose executions normally compute values of type `T`.
`thunk(abstraction(X))` evaluates to a thunk with dynamic bindings,
`thunk(closure(X))` computes a thunk with static bindings.
*/
Funcon
force(_:thunks(T)) : =>T
/*
`force(H)` enacts the abstraction of the thunk `H`.
*/
Rule
force(thunk(abstraction(X))) ~> no-given(X)

68
IBAF-cbs/Funcons-beta/Values/Abstraction/Thunks/index.md Normal file
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---
layout: default
title: "Thunks"
parent: Abstraction
ancestor: Funcons-beta
---
[Funcons-beta] : [Thunks.cbs]
-----------------------------
### Thunks
<div class="highlighter-rouge"><pre class="highlight"><code>[
<i class="keyword">Datatype</i> <span class="name"><a href="#Name_thunks">thunks</a></span>
<i class="keyword">Funcon</i> <span class="name"><a href="#Name_thunk">thunk</a></span>
<i class="keyword">Funcon</i> <span class="name"><a href="#Name_force">force</a></span>
]</code></pre></div>
<div class="highlighter-rouge"><pre class="highlight"><code><i class="keyword">Meta-variables</i>
<span id="PartVariable_T"><i class="var">T</i></span> <: <span class="name"><a href="../../Value-Types/index.html#Name_values">values</a></span></code></pre></div>
<div class="highlighter-rouge"><pre class="highlight"><code><i class="keyword">Datatype</i>
<span class="name"><span id="Name_thunks">thunks</span></span>(<span id="Variable40_T"><i class="var">T</i></span>) ::= <span id="Name_thunk">thunk</span>(_:<span class="name"><a href="../Generic/index.html#Name_abstractions">abstractions</a></span>(()=><span id="Variable62_T"><i class="var">T</i></span>))</code></pre></div>
<code><span class="name"><a href="#Name_thunks">thunks</a></span>(<i class="var">T</i>)</code> consists of abstractions whose bodies do not depend on
a given value, and whose executions normally compute values of type <code><i class="var">T</i></code>.
<code><span class="name"><a href="#Name_thunk">thunk</a></span>(<span class="name"><a href="../Generic/index.html#Name_abstraction">abstraction</a></span>(<i class="var">X</i>))</code> evaluates to a thunk with dynamic bindings,
<code><span class="name"><a href="#Name_thunk">thunk</a></span>(<span class="name"><a href="../Generic/index.html#Name_closure">closure</a></span>(<i class="var">X</i>))</code> computes a thunk with static bindings.
<div class="highlighter-rouge"><pre class="highlight"><code><i class="keyword">Funcon</i>
<span class="name"><span id="Name_force">force</span></span>(_:<span class="name"><a href="#Name_thunks">thunks</a></span>(<span id="Variable187_T"><i class="var">T</i></span>)) : =><span id="Variable207_T"><i class="var">T</i></span></code></pre></div>
<code><span class="name"><a href="#Name_force">force</a></span>(<i class="var">H</i>)</code> enacts the abstraction of the thunk <code><i class="var">H</i></code>.
<div class="highlighter-rouge"><pre class="highlight"><code><i class="keyword">Rule</i>
<span class="name"><a href="#Name_force">force</a></span>(<span class="name"><a href="#Name_thunk">thunk</a></span>(<span class="name"><a href="../Generic/index.html#Name_abstraction">abstraction</a></span>(<span id="Variable257_X"><i class="var">X</i></span>))) ~> <span class="name"><a href="../../../Computations/Normal/Giving/index.html#Name_no-given">no-given</a></span>(<a href="#Variable257_X"><i class="var">X</i></a>)</code></pre></div>
____
From the [PLanCompS Project] | [CBS-beta issues...] | [Suggest an improvement...]
[Thunks.cbs]: Thunks.cbs
"CBS SOURCE FILE"
[Funcons-beta]: /CBS-beta/docs/Funcons-beta
"FUNCONS-BETA"
[Unstable-Funcons-beta]: /CBS-beta/docs/Unstable-Funcons-beta
"UNSTABLE-FUNCONS-BETA"
[Languages-beta]: /CBS-beta/docs/Languages-beta
"LANGUAGES-BETA"
[Unstable-Languages-beta]: /CBS-beta/docs/Unstable-Languages-beta
"UNSTABLE-LANGUAGES-BETA"
[CBS-beta]: /CBS-beta "CBS-BETA"
[PLanCompS Project]: https://plancomps.github.io
"PROGRAMMING LANGUAGE COMPONENTS AND SPECIFICATIONS PROJECT HOME PAGE"
[CBS-beta issues...]: https://github.com/plancomps/CBS-beta/issues
"CBS-BETA ISSUE REPORTS ON GITHUB"
[Suggest an improvement...]: mailto:plancomps@gmail.com?Subject=CBS-beta%20-%20comment&Body=Re%3A%20CBS-beta%20specification%20at%20Values/Abstraction/Thunks/Thunks.cbs%0A%0AComment/Query/Issue/Suggestion%3A%0A%0A%0ASignature%3A%0A
"GENERATE AN EMAIL TEMPLATE"

25
IBAF-cbs/Funcons-beta/Values/Abstraction/Thunks/tests/thunk-abstraction.config Normal file
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general {
funcon-term:
initialise-giving
initialise-binding
scope(
bind-value("x",99),
give(
tuple(
99,
thunk abstraction(
sequential(
print bound-value"x",
print first tuple-elements bound-value"tup"))),
scope(
collateral(
bind-value("x",42),
bind-value("tup",tuple(42, second tuple-elements given))),
force second tuple-elements given)))
;
}
tests {
result-term: null-value;
standard-out: [42, 42];
}

27
IBAF-cbs/Funcons-beta/Values/Abstraction/Thunks/tests/thunk-closure.config Normal file
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general {
funcon-term:
initialise-giving
initialise-binding
scope(
bind-value("x",99),
give(
tuple(
99,
thunk closure(
sequential(
print bound-value"x",
print first tuple-elements bound-value"tup"))),
scope(
collateral(
bind-value("x",42),
bind-value("tup",tuple(42, second tuple-elements given))),
else(
force second tuple-elements given,
print 77))))
;
}
tests {
result-term: null-value;
standard-out: [99, 77];
}