qlist 对结构体排序

结构体排序：

写法一

QList<test> s;
test aa;
test bb;
test cc;
aa.num = "14";
bb.num = "2";
cc.num = "3";
s.append(aa);
s.append(bb);
s.append(cc);


qSort(s.begin(), s.end(),[](const test &infoA,const test &infoB){return infoA.num.toDouble() < infoB.num.toDouble();});


for(int i = 0; i < s.count() ; i++)
{
qDebug() << s.at(i).num;
}

写法二

#include "widget.h"
#include <QApplication>
#include <QtDebug>


//排列判断
int compare(const test &infoA,const test &infoB)
{
return infoA.num.toDouble() < infoB.num.toDouble();
}


int main(int argc, char *argv[])
{
QApplication a(argc, argv);


QList<test> s;
test aa;
test bb;
test cc;
aa.num = "14";
bb.num = "2";
cc.num = "3";
s.append(aa);
s.append(bb);
s.append(cc);


qSort(s.begin(), s.end(),compare);


for(int i = 0; i < s.count() ; i++)
{
qDebug() << s.at(i).num;
}


return a.exec();
}

Qt中可以使用qSort可以对容器排序，助手中有很多示例，大多数关于int、QString的排序，今天这里主要讲解qSort如何对结构体进行排序的。

Qt对整形排序：

QList list;
list << 33 << 12 << 68 << 6 << 12;
qSort(list.begin(), list.end());
// list: [ 6, 12, 12, 33, 68 ]
Qt对字符串排序：

bool caseInsensitiveLessThan(const QString &s1, const QString &s2)
{
return s1.toLower() < s2.toLower();
}

int doSomething()
{
QStringList list;
list << "AlPha" << "beTA" << "gamma" << "DELTA";
qSort(list.begin(), list.end(), caseInsensitiveLessThan);
// list: [ "AlPha", "beTA", "DELTA", "gamma" ]
}
Qt对结构体排序：

struct BarAmount
{
int barLevel; //钢筋级别
QString diameter; //钢筋直径
double planAmount; //计划量
double purchaseAmount; //采购量
double amount; //总量
};
结构体如上所示， 对QList barDataList可通过以下方式进行排序！

void OverdraftControl::sortBarData(QList *barDataList)
{
qSort(barDataList->begin(), barDataList->end(), compareBarData);
}
bool compareBarData(const BarAmount &barAmount1, const BarAmount &barAmount2)
{
if (barAmount1.barLevel < barAmount2.barLevel)
{
return true;
}
else if (barAmount1.barLevel > barAmount2.barLevel)
{
return false;
}
else
{
QString strDiameter1 = barAmount1.diameter;
QString strDiameter2 = barAmount2.diameter;
int nCompare = compareDiameterDescription(strDiameter1,strDiameter2);
if (nCompare == -1)
{
return true;
}
else if (nCompare == 1)
{
return false;
}
else
{
return true;
}
}
}
直接调用sortBarData(&barDataList)就可以完成对QList barDataList的排序了！