mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-10-30 15:32:52 +01:00
76 lines
2.2 KiB
C++
76 lines
2.2 KiB
C++
//===- llvm/ADT/DenseMap.h - A dense map implmentation ----------*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file was developed by the LLVM research group and is distributed under
|
|
// the University of Illinois Open Source License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file implements a dense map. A dense map template takes two
|
|
// types. The first is the mapped type and the second is a functor
|
|
// that maps its argument to a size_t. On instantiation a "null" value
|
|
// can be provided to be used as a "does not exist" indicator in the
|
|
// map. A member function grow() is provided that given the value of
|
|
// the maximally indexed key (the argument of the functor) makes sure
|
|
// the map has enough space for it.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_ADT_DENSEMAP_H
|
|
#define LLVM_ADT_DENSEMAP_H
|
|
|
|
#include <functional>
|
|
#include <vector>
|
|
#include <cassert>
|
|
|
|
namespace llvm {
|
|
|
|
struct IdentityFunctor : std::unary_function<unsigned, unsigned> {
|
|
unsigned operator()(unsigned Index) const {
|
|
return Index;
|
|
}
|
|
};
|
|
|
|
template <typename T, typename ToIndexT = IdentityFunctor>
|
|
class DenseMap {
|
|
typedef typename ToIndexT::argument_type IndexT;
|
|
typedef std::vector<T> StorageT;
|
|
StorageT storage_;
|
|
T nullVal_;
|
|
ToIndexT toIndex_;
|
|
|
|
public:
|
|
DenseMap() : nullVal_(T()) { }
|
|
|
|
explicit DenseMap(const T& val) : nullVal_(val) { }
|
|
|
|
typename StorageT::reference operator[](IndexT n) {
|
|
assert(toIndex_(n) < storage_.size() && "index out of bounds!");
|
|
return storage_[toIndex_(n)];
|
|
}
|
|
|
|
typename StorageT::const_reference operator[](IndexT n) const {
|
|
assert(toIndex_(n) < storage_.size() && "index out of bounds!");
|
|
return storage_[toIndex_(n)];
|
|
}
|
|
|
|
void clear() {
|
|
storage_.clear();
|
|
}
|
|
|
|
void grow(IndexT n) {
|
|
unsigned NewSize = toIndex_(n) + 1;
|
|
if (NewSize > storage_.size())
|
|
storage_.resize(NewSize, nullVal_);
|
|
}
|
|
|
|
typename StorageT::size_type size() const {
|
|
return storage_.size();
|
|
}
|
|
};
|
|
|
|
} // End llvm namespace
|
|
|
|
#endif
|