77 lines
2.6 KiB
C++
77 lines
2.6 KiB
C++
//===- llvm/ADT/EnumeratedArray.h - Enumerated Array-------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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///
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/// \file
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/// This file defines an array type that can be indexed using scoped enum
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/// values.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ADT_ENUMERATEDARRAY_H
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#define LLVM_ADT_ENUMERATEDARRAY_H
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#include "llvm/ADT/STLExtras.h"
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#include <array>
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#include <cassert>
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namespace llvm {
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template <typename ValueType, typename Enumeration,
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Enumeration LargestEnum = Enumeration::Last, typename IndexType = int,
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IndexType Size = 1 + static_cast<IndexType>(LargestEnum)>
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class EnumeratedArray {
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static_assert(Size > 0);
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using ArrayTy = std::array<ValueType, Size>;
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ArrayTy Underlying;
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public:
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using iterator = typename ArrayTy::iterator;
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using const_iterator = typename ArrayTy::const_iterator;
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using reverse_iterator = typename ArrayTy::reverse_iterator;
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using const_reverse_iterator = typename ArrayTy::const_reverse_iterator;
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using value_type = ValueType;
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using reference = ValueType &;
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using const_reference = const ValueType &;
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using pointer = ValueType *;
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using const_pointer = const ValueType *;
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EnumeratedArray() = default;
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EnumeratedArray(ValueType V) { Underlying.fill(V); }
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EnumeratedArray(std::initializer_list<ValueType> Init) {
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assert(Init.size() == Size && "Incorrect initializer size");
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llvm::copy(Init, Underlying.begin());
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}
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const ValueType &operator[](Enumeration Index) const {
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auto IX = static_cast<IndexType>(Index);
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assert(IX >= 0 && IX < Size && "Index is out of bounds.");
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return Underlying[IX];
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}
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ValueType &operator[](Enumeration Index) {
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return const_cast<ValueType &>(
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static_cast<const EnumeratedArray &>(*this)[Index]);
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}
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IndexType size() const { return Size; }
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bool empty() const { return size() == 0; }
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iterator begin() { return Underlying.begin(); }
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const_iterator begin() const { return Underlying.begin(); }
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iterator end() { return Underlying.end(); }
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const_iterator end() const { return Underlying.end(); }
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reverse_iterator rbegin() { return Underlying.rbegin(); }
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const_reverse_iterator rbegin() const { return Underlying.rbegin(); }
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reverse_iterator rend() { return Underlying.rend(); }
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const_reverse_iterator rend() const { return Underlying.rend(); }
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};
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} // namespace llvm
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#endif // LLVM_ADT_ENUMERATEDARRAY_H
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