mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-07-17 20:29:31 +00:00
7c78afefe9
other clients. The problem is that the nullVal member was left to the default constructor to initialize, which for int's does nothing (ie, leaves it unspecified). To get a zero value, we must use T(). It's C++ wonderful? :) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11867 91177308-0d34-0410-b5e6-96231b3b80d8
64 lines
1.9 KiB
C++
64 lines
1.9 KiB
C++
//===- 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 SUPPORT_DENSEMAP_H
|
|
#define SUPPORT_DENSEMAP_H
|
|
|
|
#include <vector>
|
|
|
|
namespace llvm {
|
|
|
|
template <typename T, typename ToIndexT>
|
|
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_);
|
|
}
|
|
};
|
|
|
|
} // End llvm namespace
|
|
|
|
#endif
|