mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-25 20:23:11 +01:00
cc2c05cb75
Fix some problems with the hidden copy constructors for ImmutableMap/ImmutableSet found by Clang++. llvm-svn: 86186
85 lines
2.7 KiB
C++
85 lines
2.7 KiB
C++
//===- llvm/ADT/PriorityQueue.h - Priority queues ---------------*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file defines the PriorityQueue class.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_ADT_PRIORITY_QUEUE_H
|
|
#define LLVM_ADT_PRIORITY_QUEUE_H
|
|
|
|
#include <algorithm>
|
|
#include <queue>
|
|
|
|
namespace llvm {
|
|
|
|
/// PriorityQueue - This class behaves like std::priority_queue and
|
|
/// provides a few additional convenience functions.
|
|
///
|
|
template<class T,
|
|
class Sequence = std::vector<T>,
|
|
class Compare = std::less<typename Sequence::value_type> >
|
|
class PriorityQueue : public std::priority_queue<T, Sequence, Compare> {
|
|
public:
|
|
explicit PriorityQueue(const Compare &compare = Compare(),
|
|
const Sequence &sequence = Sequence())
|
|
: std::priority_queue<T, Sequence, Compare>(compare, sequence)
|
|
{}
|
|
|
|
template<class Iterator>
|
|
PriorityQueue(Iterator begin, Iterator end,
|
|
const Compare &compare = Compare(),
|
|
const Sequence &sequence = Sequence())
|
|
: std::priority_queue<T, Sequence, Compare>(begin, end, compare, sequence)
|
|
{}
|
|
|
|
/// erase_one - Erase one element from the queue, regardless of its
|
|
/// position. This operation performs a linear search to find an element
|
|
/// equal to t, but then uses all logarithmic-time algorithms to do
|
|
/// the erase operation.
|
|
///
|
|
void erase_one(const T &t) {
|
|
// Linear-search to find the element.
|
|
typename Sequence::size_type i =
|
|
std::find(this->c.begin(), this->c.end(), t) - this->c.begin();
|
|
|
|
// Logarithmic-time heap bubble-up.
|
|
while (i != 0) {
|
|
typename Sequence::size_type parent = (i - 1) / 2;
|
|
this->c[i] = this->c[parent];
|
|
i = parent;
|
|
}
|
|
|
|
// The element we want to remove is now at the root, so we can use
|
|
// priority_queue's plain pop to remove it.
|
|
this->pop();
|
|
}
|
|
|
|
/// reheapify - If an element in the queue has changed in a way that
|
|
/// affects its standing in the comparison function, the queue's
|
|
/// internal state becomes invalid. Calling reheapify() resets the
|
|
/// queue's state, making it valid again. This operation has time
|
|
/// complexity proportional to the number of elements in the queue,
|
|
/// so don't plan to use it a lot.
|
|
///
|
|
void reheapify() {
|
|
std::make_heap(this->c.begin(), this->c.end(), this->comp);
|
|
}
|
|
|
|
/// clear - Erase all elements from the queue.
|
|
///
|
|
void clear() {
|
|
this->c.clear();
|
|
}
|
|
};
|
|
|
|
} // End llvm namespace
|
|
|
|
#endif
|