68 lines
2.2 KiB
C++
68 lines
2.2 KiB
C++
/* @file Integer.hpp
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*
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* author: Roland Conybeare, Aug 2025
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*/
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#pragma once
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#include "Number.hpp"
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#include "ObjectConversion.hpp"
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#include "xo/indentlog/print/tag.hpp"
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namespace xo {
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namespace obj {
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class Integer : public Number {
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public:
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using IAlloc = xo::gc::IAlloc;
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using int_type = long long;
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public:
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Integer() = default;
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explicit Integer(int_type x);
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/** create instance holding integer value @p x **/
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static gp<Integer> make(IAlloc * mm, int_type x);
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/** downcast from @p x iff x is actually an Integer. Otherwise nullptr **/
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static gp<Integer> from(gp<IObject> x);
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int_type value() const { return value_; }
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void assign_value(int_type x) { value_ = x; }
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// inherited from Object..
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virtual TaggedPtr self_tp() const final override;
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virtual void display(std::ostream & os) const final override;
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virtual std::size_t _shallow_size() const final override;
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virtual Object * _shallow_copy(gc::IAlloc * gc) const final override;
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virtual std::size_t _forward_children(gc::IAlloc * gc) final override;
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private:
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int_type value_ = 0;
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};
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template <typename IntType>
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struct ObjectConversion_Integer {
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static gp<Object> to_object(gc::IAlloc * mm, IntType x) {
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return new (MMPtr(mm)) Integer(x);
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}
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static IntType from_object(gc::IAlloc *, gp<Object> x) {
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gp<Integer> x_int = Integer::from(x);
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if (x_int.get()) {
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return x_int->value();
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} else {
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throw std::runtime_error(tostr("ObjectConversion_Integer: x found where Integer expected", xtag("x", x)));
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}
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}
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};
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template <>
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struct ObjectConversion<int64_t> : public ObjectConversion_Integer<int64_t> {};
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template <>
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struct ObjectConversion<int32_t> : public ObjectConversion_Integer<int32_t> {};
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template <>
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struct ObjectConversion<int16_t> : public ObjectConversion_Integer<int16_t> {};
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} /*namespace obj*/
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} /*namespace xo*/
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/* end Integer.hpp */
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