72 lines
1.7 KiB
C++
72 lines
1.7 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "intcnt.h"
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IntCount::IntCount() : numInts(0), iPair(nullptr) { }
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IntCount::~IntCount() { delete [] iPair;}
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int IntCount::getSize() {return numInts;}
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int IntCount::getCount(int pos) {return iPair[pos].cnt;}
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int IntCount::getIndex(int pos) {return iPair[pos].idx;}
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void IntCount::clear()
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{
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delete[] iPair;
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iPair = new IntPair[0];
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numInts = 0;
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}
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int IntCount::countAdd(int index, int increment)
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{
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if(numInts) {
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// Do a binary search to find the element
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int divPoint = 0;
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if(index>iPair[numInts-1].idx) {
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divPoint = numInts;
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} else if(index<iPair[0].idx) {
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divPoint = 0;
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} else {
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int low=0, high=numInts-1;
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int mid = (low+high)/2;
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while(1) {
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mid = (low+high)/2;
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if(index<iPair[mid].idx) {
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high = mid;
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} else if(index>iPair[mid].idx) {
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if(mid<numInts-1 && index<iPair[mid+1].idx) {
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divPoint = mid+1;
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break;
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} else {
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low = mid+1;
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}
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} else if(index==iPair[mid].idx) {
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return iPair[mid].cnt += increment;
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}
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}
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}
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int i;
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IntPair *tpair = new IntPair[numInts+1];
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for(i=0; i<divPoint; i++) {
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tpair[i] = iPair[i];
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}
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for(i=divPoint; i<numInts; i++) {
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tpair[i+1] = iPair[i];
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}
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++numInts;
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delete [] iPair;
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iPair = tpair;
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iPair[divPoint].idx = index;
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iPair[divPoint].cnt = increment;
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return increment;
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} else {
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iPair = new IntPair[1];
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numInts = 1;
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iPair[0].idx = index;
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return iPair[0].cnt = increment;
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}
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}
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