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80 lines
1.8 KiB
80 lines
1.8 KiB
#pragma once
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#include <cstdint>
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#include <cmath>
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namespace hv
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{
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/// A typed span of continuous memory with a bound.
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template<typename T>
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struct span
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{
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inline span(T* ptr, std::size_t len)
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: ptr(ptr),len(len){}
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inline operator T*() {return ptr;}
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inline operator const T* const() {return ptr;}
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inline T& operator*() {return *ptr;}
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inline const T& operator*() const {return *ptr;}
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inline T& operator[](std::size_t index)
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{
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#ifdef DEBUG
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if (index>=len) std::terminate(); // "tried to index out of bounds of array";
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#endif
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return ptr[index];
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}
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inline const T& operator[](std::size_t index) const
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{
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#ifdef DEBUG
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if (index>=len) std::terminate(); // "tried to index out of bounds of array";
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#endif
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return ptr[index];
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}
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inline span<T> slice(std::size_t off, std::size_t len)
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{
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len = std::min(this->len, len);
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if(len+off>=len || len < off) std::terminate(); // "tried to index out of bounds of array";
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return span<T>(ptr+off, len-off);
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}
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inline span<T> slice(std::size_t off)
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{
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if(len+off>=len || len < off) std::terminate(); // "tried to index out of bounds of array";
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return span<T>(ptr+off, len-off);
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}
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template<typename U>
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inline span<U> reinterpret()
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{
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return span<U>((U*)ptr, size_bytes() / sizeof(U));
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}
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inline T* operator ->()
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{
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return ptr;
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}
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inline const T* operator ->() const
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{
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return ptr;
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}
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inline T* raw() {
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return ptr;
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}
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inline const T* raw() const {
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return ptr;
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}
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inline std::size_t size() const {
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return len;
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}
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inline std::size_t size_bytes() const {
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return len * sizeof(T);
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}
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private:
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T* const ptr;
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std::size_t len;
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};
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}
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