79 lines
1.5 KiB
C++
79 lines
1.5 KiB
C++
#ifndef ARRAY_SLICE_H
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#define ARRAY_SLICE_H
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#include "fixed_array.h"
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#include <core/error_macros.h>
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#include <vector>
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// View into an array, referencing a pointer and a size.
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template <typename T>
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class ArraySlice {
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public:
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inline ArraySlice() :
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_ptr(nullptr),
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_size(0) {
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}
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// TODO Get rid of unsafe constructor, use specialized ones
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inline ArraySlice(T *p_ptr, size_t p_begin, size_t p_end) {
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CRASH_COND(p_end <= p_begin);
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_ptr = p_ptr + p_begin;
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_size = p_end - p_begin;
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}
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inline ArraySlice(std::vector<T> &vec, size_t p_begin, size_t p_end) {
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CRASH_COND(p_end <= p_begin);
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CRASH_COND(p_begin >= vec.size());
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CRASH_COND(p_end > vec.size()); // `>` because p_end is typically `p_begin + size`
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_ptr = &vec[p_begin];
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_size = p_end - p_begin;
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}
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template <unsigned int N>
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inline ArraySlice(FixedArray<T, N> &a) {
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_ptr = a.data();
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_size = a.size();
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}
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template <typename U>
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ArraySlice<U> reinterpret_cast_to() const {
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const size_t size_in_bytes = _size * sizeof(T);
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#ifdef DEBUG_ENABLED
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CRASH_COND(size_in_bytes % sizeof(U) != 0);
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#endif
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return ArraySlice<U>((U *)_ptr, 0, size_in_bytes / sizeof(U));
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}
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inline T &operator[](size_t i) {
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#ifdef DEBUG_ENABLED
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CRASH_COND(i >= _size);
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#endif
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return _ptr[i];
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}
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inline const T &operator[](size_t i) const {
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#ifdef DEBUG_ENABLED
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CRASH_COND(i >= _size);
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#endif
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return _ptr[i];
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}
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inline size_t size() const {
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return _size;
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}
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inline T *data() {
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return _ptr;
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}
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inline const T *data() const {
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return _ptr;
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}
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private:
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T *_ptr;
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size_t _size;
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};
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#endif // ARRAY_SLICE_H
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