50 lines
1.5 KiB
C++
50 lines
1.5 KiB
C++
/** @file ConstantInterface.hpp
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*
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* Author: Roland Conybeare
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**/
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#pragma once
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#include "Expression.hpp"
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#include "xo/reflect/Reflect.hpp"
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#include "xo/reflect/TypeDescr.hpp"
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#include <type_traits>
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namespace xo {
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namespace scm {
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/** @class ConstantInterface
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* @brief syntax for a literal constant.
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**/
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class ConstantInterface : public Expression {
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public:
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using TaggedPtr = xo::reflect::TaggedPtr;
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using TypeDescr = xo::reflect::TypeDescr;
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public:
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/** @p extype sets expression-type; could be constant|primitive **/
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ConstantInterface(exprtype extype, TypeDescr valuetype) : Expression{extype, valuetype} {}
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/** downcast from Expression **/
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static bp<ConstantInterface> from(bp<Expression> x) {
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return bp<ConstantInterface>::from(x);
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}
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/** type description for representation of literal value **/
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virtual TypeDescr value_td() const = 0;
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/** reflection-tagged pointer to literal value of this constant **/
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virtual TaggedPtr value_tp() const = 0;
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// ----- Expression -----
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virtual std::set<std::string> get_free_variables() const override {
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return std::set<std::string>();
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}
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virtual void attach_envs(bp<SymbolTable> /*p*/) override {}
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}; /*ConstantInterface*/
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} /*namespace scm*/
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} /*namespace xo*/
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/** end ConstantInterface.hpp **/
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