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[ADT] Implement EnumeratedArray with std::array (NFC) #158407

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merged 2 commits into from
Sep 13, 2025
Merged

[ADT] Implement EnumeratedArray with std::array (NFC) #158407

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[ADT] Implement EnumeratedArray with std::array (NFC)
kazutakahirata Sep 3, 2025
dce2543
Address comments.
kazutakahirata Sep 13, 2025
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50 changes: 20 additions & 30 deletions llvm/include/llvm/ADT/EnumeratedArray.h
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Original file line number Diff line number Diff line change
Expand Up @@ -15,21 +15,25 @@
#ifndef LLVM_ADT_ENUMERATEDARRAY_H
#define LLVM_ADT_ENUMERATEDARRAY_H

#include "llvm/ADT/STLExtras.h"
#include <array>
#include <cassert>
#include <iterator>

namespace llvm {

template <typename ValueType, typename Enumeration,
Enumeration LargestEnum = Enumeration::Last, typename IndexType = int,
IndexType Size = 1 + static_cast<IndexType>(LargestEnum)>
class EnumeratedArray {
public:
using iterator = ValueType *;
using const_iterator = const ValueType *;
static_assert(Size > 0);
using ArrayTy = std::array<ValueType, Size>;
ArrayTy Underlying;

using const_reverse_iterator = std::reverse_iterator<const_iterator>;
using reverse_iterator = std::reverse_iterator<iterator>;
public:
using iterator = typename ArrayTy::iterator;
using const_iterator = typename ArrayTy::const_iterator;
using reverse_iterator = typename ArrayTy::reverse_iterator;
using const_reverse_iterator = typename ArrayTy::const_reverse_iterator;

using value_type = ValueType;
using reference = ValueType &;
Expand All @@ -38,16 +42,10 @@ class EnumeratedArray {
using const_pointer = const ValueType *;

EnumeratedArray() = default;
EnumeratedArray(ValueType V) {
for (IndexType IX = 0; IX < Size; ++IX) {
Underlying[IX] = V;
}
}
EnumeratedArray(ValueType V) { Underlying.fill(V); }
EnumeratedArray(std::initializer_list<ValueType> Init) {
assert(Init.size() == Size && "Incorrect initializer size");
for (IndexType IX = 0; IX < Size; ++IX) {
Underlying[IX] = *(Init.begin() + IX);
}
llvm::copy(Init, Underlying.begin());
}

const ValueType &operator[](Enumeration Index) const {
Expand All @@ -62,23 +60,15 @@ class EnumeratedArray {
IndexType size() const { return Size; }
bool empty() const { return size() == 0; }

iterator begin() { return Underlying; }
const_iterator begin() const { return Underlying; }

iterator end() { return begin() + size(); }
const_iterator end() const { return begin() + size(); }

reverse_iterator rbegin() { return reverse_iterator(end()); }
const_reverse_iterator rbegin() const {
return const_reverse_iterator(end());
}
reverse_iterator rend() { return reverse_iterator(begin()); }
const_reverse_iterator rend() const {
return const_reverse_iterator(begin());
}
iterator begin() { return Underlying.begin(); }
const_iterator begin() const { return Underlying.begin(); }
iterator end() { return Underlying.end(); }
const_iterator end() const { return Underlying.end(); }

private:
ValueType Underlying[Size];
reverse_iterator rbegin() { return Underlying.rbegin(); }
const_reverse_iterator rbegin() const { return Underlying.rbegin(); }
reverse_iterator rend() { return Underlying.rend(); }
const_reverse_iterator rend() const { return Underlying.rend(); }
};

} // namespace llvm
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