mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-10-30 15:32:52 +01:00
bf023c019d
llvm-svn: 25657
91 lines
2.6 KiB
C++
91 lines
2.6 KiB
C++
|
|
//===-- llvm/ADT/UniqueVector.h ---------------------------------*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file was developed by James M. Laskey and is distributed under
|
|
// the University of Illinois Open Source License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_ADT_UNIQUEVECTOR_H
|
|
#define LLVM_ADT_UNIQUEVECTOR_H
|
|
|
|
#include <map>
|
|
#include <vector>
|
|
|
|
namespace llvm {
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
/// UniqueVector - This class produces a sequential ID number (base 1) for each
|
|
/// unique entry that is added. T is the type of entries in the vector. This
|
|
/// class should have an implementation of operator== and of operator<.
|
|
/// Entries can be fetched using operator[] with the entry ID.
|
|
template<class T> class UniqueVector {
|
|
private:
|
|
// Map - Used to handle the correspondence of entry to ID.
|
|
std::map<T, unsigned> Map;
|
|
|
|
// Vector - ID ordered vector of entries. Entries can be indexed by ID - 1.
|
|
//
|
|
std::vector<const T *> Vector;
|
|
|
|
public:
|
|
/// insert - Append entry to the vector if it doesn't already exist. Returns
|
|
/// the entry's index + 1 to be used as a unique ID.
|
|
unsigned insert(const T &Entry) {
|
|
// Check if the entry is already in the map.
|
|
typename std::map<T, unsigned>::iterator MI = Map.lower_bound(Entry);
|
|
|
|
// See if entry exists, if so return prior ID.
|
|
if (MI != Map.end() && MI->first == Entry) return MI->second;
|
|
|
|
// Compute ID for entry.
|
|
unsigned ID = Vector.size() + 1;
|
|
|
|
// Insert in map.
|
|
MI = Map.insert(MI, std::make_pair(Entry, ID));
|
|
|
|
// Insert in vector.
|
|
Vector.push_back(&MI->first);
|
|
|
|
return ID;
|
|
}
|
|
|
|
/// idFor - return the ID for an existing entry. Returns 0 if the entry is
|
|
/// not found.
|
|
unsigned idFor(const T &Entry) const {
|
|
// Search for entry in the map.
|
|
typename std::map<T, unsigned>::iterator MI = Map.find(Entry);
|
|
|
|
// See if entry exists, if so return ID.
|
|
if (MI != Map.end()) return MI->second;
|
|
|
|
// No luck.
|
|
return 0;
|
|
}
|
|
|
|
/// operator[] - Returns a reference to the entry with the specified ID.
|
|
///
|
|
const T &operator[](unsigned ID) const { return *Vector[ID - 1]; }
|
|
|
|
/// size - Returns the number of entries in the vector.
|
|
///
|
|
size_t size() const { return Vector.size(); }
|
|
|
|
/// empty - Returns true if the vector is empty.
|
|
///
|
|
bool empty() const { return Vector.empty(); }
|
|
|
|
/// reset - Clears all the entries.
|
|
///
|
|
void reset() {
|
|
Map.clear();
|
|
Vector.resize(0, 0);
|
|
}
|
|
};
|
|
|
|
} // End of namespace llvm
|
|
|
|
#endif // LLVM_ADT_UNIQUEVECTOR_H
|