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50 lines
1.3 KiB
50 lines
1.3 KiB
4 weeks ago
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#pragma once
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template <typename T, size_t bits_to_store>
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struct marked_ptr {
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static constexpr size_t mask = (1 << bits_to_store) - 1;
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// static_assert(alignof(T) >= (1 << bits_to_store));
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marked_ptr(T* ptr = nullptr) : ptr(ptr) {}
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marked_ptr(T* ptr, size_t mark) : ptr((T*)((size_t)ptr | (mark & mask))) {}
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T* get_ptr() const { return (T*)((size_t)ptr & ~1); }
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size_t get_mark() const { return (size_t)ptr & mask; }
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void set_ptr(T* ptr) { this->ptr = (T*)((size_t)ptr | is_marked()); }
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void set_mark(size_t mark) { ptr = (T*)((size_t)ptr | (mark & mask)); }
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operator T*() const { return get_ptr(); }
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operator size_t() const { return get_mark(); }
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protected:
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T* ptr{nullptr};
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};
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template <typename T>
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struct marked_ptr<T, 1> {
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// static_assert(alignof(T) >= 1);
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marked_ptr(T* ptr = nullptr) : ptr(ptr) {}
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marked_ptr(T* ptr, bool mark) : ptr((T*)((size_t)ptr | mark)) {}
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T* get_ptr() const { return (T*)((size_t)ptr & ~1); }
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bool is_marked() const { return (size_t)ptr & 1; }
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void set_ptr(T* ptr) { this->ptr = (T*)((size_t)ptr | is_marked()); }
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void set_mark(bool mark) { ptr = (T*)((size_t)ptr | mark); }
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operator T*() const { return get_ptr(); }
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operator bool() const { return is_marked(); }
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protected:
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T* ptr{nullptr};
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};
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