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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
85 lines
2.5 KiB
C++
85 lines
2.5 KiB
C++
//===- llvm/ADT/IndexedMap.h - An index map implementation ------*- 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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// This file implements an indexed map. The index map template takes two
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// types. The first is the mapped type and the second is a functor
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// that maps its argument to a size_t. On instantiation a "null" value
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// can be provided to be used as a "does not exist" indicator in the
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// map. A member function grow() is provided that given the value of
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// the maximally indexed key (the argument of the functor) makes sure
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// the map has enough space for it.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ADT_INDEXEDMAP_H
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#define LLVM_ADT_INDEXEDMAP_H
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/ADT/STLExtras.h"
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#include <cassert>
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namespace llvm {
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template <typename T, typename ToIndexT = identity<unsigned>>
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class IndexedMap {
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using IndexT = typename ToIndexT::argument_type;
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// Prefer SmallVector with zero inline storage over std::vector. IndexedMaps
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// can grow very large and SmallVector grows more efficiently as long as T
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// is trivially copyable.
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using StorageT = SmallVector<T, 0>;
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StorageT storage_;
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T nullVal_;
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ToIndexT toIndex_;
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public:
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IndexedMap() : nullVal_(T()) {}
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explicit IndexedMap(const T& val) : nullVal_(val) {}
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typename StorageT::reference operator[](IndexT n) {
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assert(toIndex_(n) < storage_.size() && "index out of bounds!");
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return storage_[toIndex_(n)];
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}
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typename StorageT::const_reference operator[](IndexT n) const {
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assert(toIndex_(n) < storage_.size() && "index out of bounds!");
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return storage_[toIndex_(n)];
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}
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void reserve(typename StorageT::size_type s) {
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storage_.reserve(s);
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}
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void resize(typename StorageT::size_type s) {
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storage_.resize(s, nullVal_);
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}
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void clear() {
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storage_.clear();
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}
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void grow(IndexT n) {
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unsigned NewSize = toIndex_(n) + 1;
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if (NewSize > storage_.size())
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resize(NewSize);
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}
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bool inBounds(IndexT n) const {
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return toIndex_(n) < storage_.size();
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}
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typename StorageT::size_type size() const {
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return storage_.size();
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}
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};
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} // end namespace llvm
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#endif // LLVM_ADT_INDEXEDMAP_H
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