73 lines
1.5 KiB
C++
73 lines
1.5 KiB
C++
namespace factor
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{
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template <typename T> cell tag(T *value)
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{
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return RETAG(value,tag_for(T::type_number));
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}
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inline static cell tag_dynamic(object *value)
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{
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return RETAG(value,tag_for(value->h.hi_tag()));
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}
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template <typename T>
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struct tagged
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{
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cell value_;
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cell value() const { return value_; }
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T *untagged() const { return (T *)(UNTAG(value_)); }
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cell type() const {
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cell tag = TAG(value_);
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if(tag == OBJECT_TYPE)
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return untagged()->h.hi_tag();
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else
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return tag;
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}
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bool type_p(cell type_) const { return type() == type_; }
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T *untag_check() const {
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if(T::type_number != TYPE_COUNT && !type_p(T::type_number))
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type_error(T::type_number,value_);
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return untagged();
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}
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explicit tagged(cell tagged) : value_(tagged) {
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#ifdef FACTOR_DEBUG
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untag_check();
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#endif
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}
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explicit tagged(T *untagged) : value_(factor::tag(untagged)) {
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#ifdef FACTOR_DEBUG
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untag_check();
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#endif
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}
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T *operator->() const { return untagged(); }
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cell *operator&() const { return &value_; }
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const tagged<T>& operator=(const T *x) { value_ = tag(x); return *this; }
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const tagged<T>& operator=(const cell &x) { value_ = x; return *this; }
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bool operator==(const tagged<T> &x) { return value_ == x.value_; }
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bool operator!=(const tagged<T> &x) { return value_ != x.value_; }
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template<typename X> tagged<X> as() { return tagged<X>(value_); }
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};
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template <typename T> T *untag_check(cell value)
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{
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return tagged<T>(value).untag_check();
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}
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template <typename T> T *untag(cell value)
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{
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return tagged<T>(value).untagged();
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}
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}
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