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77 lines
2.5 KiB
77 lines
2.5 KiB
#pragma once
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/// A type that spans a sized region of memory
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template<typename T>
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struct Span {
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virtual const void* area() const =0;
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virtual void* area() = 0;
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virtual size_t size() const = 0;
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inline T* ptr() { return (T*)area(); }
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inline const T* ptr() const { return (const T*)area(); }
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inline size_t size_bytes() const { return size() * sizeof(T); }
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inline unsigned char* as_bytes() { return (unsigned char*)area(); }
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inline const unsigned char* as_bytes() const { return (const unsigned char*)area(); }
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inline T& operator[](size_t index) {
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if(index >= size()) throw "Size too large";
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return ptr()[index];
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}
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inline const T& operator[](size_t index) const {
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if(index >= size()) throw "Size too large";
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return ptr()[index];
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}
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template<typename U>
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inline U* area_as() requires(sizeof(T) % sizeof(U) == 0) { return (U*)area(); }
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template<typename U>
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inline const U* area_as() const requires(sizeof(T) % sizeof(U) == 0) { return (U*)area(); }
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template<typename U>
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size_t size_as() const requires(sizeof(T) % sizeof(U) == 0) { return size_bytes() / sizeof(U); }
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struct Slice;
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inline bool bounds_ok(size_t start, size_t len)
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{
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return (start + len) < size();
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}
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inline bool bounds_ok(size_t start)
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{
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return start < size();
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}
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inline Slice slice(size_t start, size_t len) { if(bounds_ok(start,len)) return Slice(ptr()+start, len); else throw "Out of bounds slice"; }
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inline Slice slice(size_t start) { return slice(start, size()-start); }
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inline Slice slice() { return slice(0, size()); }
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template<typename U>
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inline Span<U>::Slice reinterpret() { return typename Span<U>::Slice((U*)area(), size_bytes() / sizeof(U)); }
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template<typename U>
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inline Span<const U>::Slice reinterpret() const { return typename Span<const U>::Slice((const U*)area(), size_bytes() / sizeof(U)); }
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};
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/// A slice of memory with a backing pointer and size.
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template<typename T>
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struct Span<T>::Slice : public Span<T> {
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inline Slice(T* ptr, size_t sz) : _area((void*)ptr), _size(sz){}
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inline Slice(const Span<T>& slice) : _area(const_cast<void*>(slice.area())), _size(slice.size()){}
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inline Slice(const Slice& copy) = default;
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inline Slice(Slice&& copy) : _area(copy._area), _size(copy._size){ *const_cast<size_t*>(©._size) = 0; }
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Slice() = delete;
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inline const void* area() const override { return _area; }
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inline void* area() override { return _area; }
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inline size_t size() const override { return _size; }
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private:
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void* const _area;
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const size_t _size;
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};
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template<typename T>
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using Slice = Span<T>::Slice;
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