84 lines
2.6 KiB
C++
84 lines
2.6 KiB
C++
/** @file DClosure.hpp
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*
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* @author Roland Conybeare, Feb 2026
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**/
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#pragma once
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#include "LocalEnv.hpp"
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#include <xo/expression2/LambdaExpr.hpp>
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#include <xo/procedure2/RuntimeContext.hpp>
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namespace xo {
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namespace scm {
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/** @brief runtime representation for a procedure
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*
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* Maintains lambda + captured lexical context
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**/
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class DClosure {
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public:
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using ARuntimeContext = xo::scm::ARuntimeContext;
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using ACollector = xo::mm::ACollector;
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using AAllocator = xo::mm::AAllocator;
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using AGCObject = xo::mm::AGCObject;
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using ppindentinfo = xo::print::ppindentinfo;
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using size_type = std::int32_t;
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public:
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DClosure(const DLambdaExpr * lm,
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const DLocalEnv * env);
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/** create instance using memory from @p mm
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* for lambda @p lm with captured environment @p env.
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**/
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static DClosure * make(obj<AAllocator> mm,
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const DLambdaExpr * lm,
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const DLocalEnv * env);
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/** @defgroup scm-closure-general-methods **/
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///@{
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const DLambdaExpr * lambda() const noexcept { return lambda_; }
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const DLocalEnv * env() const noexcept { return env_; }
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///@}
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/** @defgroup scm-closure-procedure-facet **/
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///@{
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/** for now, support just fixed-arity procedures **/
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bool is_nary() const noexcept { return false; }
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/** number of arguments expected by this procedure (-1 if nary) **/
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size_type n_args() const noexcept { return lambda_->n_args(); }
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obj<AGCObject> apply_nocheck(obj<ARuntimeContext> rcx, const DArray * args);
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///@}
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/** @defgroup scm-closure-gcobject-facet **/
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///@{
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std::size_t shallow_size() const noexcept;
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DClosure * shallow_copy(obj<AAllocator> mm) const noexcept;
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std::size_t forward_children(obj<ACollector> gc) noexcept;
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///@}
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/** @defgroup scm-closure-printable-facet **/
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///@{
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bool pretty(const ppindentinfo & ppii) const;
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///@}
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private:
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/** lambda expression **/
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const DLambdaExpr * lambda_ = nullptr;
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/** bindings for captured variables
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* (from lexical context where lambda evaluated)
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**/
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const DLocalEnv * env_ = nullptr;
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};
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} /*namespace scm*/
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} /*namespace xo*/
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/* end DClosure.hpp */
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