@Maarten-Verhage said in C++11 std::initializer_list for container:
QStringRef
Sounds risky to use as your key.
Warning: A QStringRef is only valid as long as the referenced string exists. If the original string is deleted, the string reference points to an invalid memory location.
Would you find a map better for this application? Map sorts your key and everything... I use the std:: containers mostly because range loops are so nice and concise.
#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include <QDebug>
int main(int argc, char *argv[])
{
qputenv("QT_IM_MODULE", QByteArray("qtvirtualkeyboard"));
QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
QGuiApplication app(argc, argv);
const std::map<std::string, int> StateIndexMap {
{ "Arizona" , 6 },
{ "Montana" , 2 },
{ "Nevada" , 5 },
{ "Texas" , 1 },
{ "North Carolina" , 3 },
{ "New Mexico" , 4 },
};
const QMap<QString, int> StateIndexQMap {
{ "Arizona" , 6 },
{ "Montana" , 2 },
{ "Nevada" , 5 },
{ "Texas" , 1 },
{ "North Carolina" , 3 },
{ "New Mexico" , 4 },
};
const std::map<int, std::string> IndexStateMap {
{ 6, "Arizona" },
{ 2, "Montana" },
{ 5, "Nevada" },
{ 1, "Texas" },
{ 3, "North Carolina"},
{ 4, "New Mexico" },
};
qDebug()<<"std::map<std::string, int> StateIndexMap";
for(const auto& StateIter : StateIndexMap){
qDebug()<<"StateIter.first: "<<StateIter.first.c_str()<<", StateIter.second: "<<StateIter.second;
printf("%s, %d", StateIter.first.c_str(), StateIter.second );
}
qDebug()<<"\r\nQMap<QString, int> StateIndexQMap";
QMap<QString, int>::const_iterator iterState = StateIndexQMap.constBegin();
while (iterState != StateIndexQMap.constEnd()) {
qDebug()<<" key(): "<<iterState.key().toLatin1().data()<<", value(): "<< iterState.value();
printf("%s, %d", iterState.key().toLatin1().data(), iterState.value() );
++iterState;
}
qDebug()<<"\r\nstd::map<int, std::string> IndexStateMap";
for(const auto& Iter : IndexStateMap){
qDebug()<<"Iter.first: "<<Iter.first<<", Iter.second: "<<Iter.second.c_str();
printf("%d, %s", Iter.first, Iter.second.c_str() );
}
QQmlApplicationEngine engine;
engine.load(QUrl(QLatin1String("qrc:/main.qml")));
return app.exec();
}
Console output:
std::map<std::string, int> StateIndexMap
StateIter.first: Arizona , StateIter.second: 6
StateIter.first: Montana , StateIter.second: 2
StateIter.first: Nevada , StateIter.second: 5
StateIter.first: New Mexico , StateIter.second: 4
StateIter.first: North Carolina , StateIter.second: 3
StateIter.first: Texas , StateIter.second: 1
QMap<QString, int> StateIndexQMap
key(): Arizona , value(): 6
key(): Montana , value(): 2
key(): Nevada , value(): 5
key(): New Mexico , value(): 4
key(): North Carolina , value(): 3
key(): Texas , value(): 1
std::map<int, std::string> IndexStateMap
Iter.first: 1 , Iter.second: Texas
Iter.first: 2 , Iter.second: Montana
Iter.first: 3 , Iter.second: North Carolina
Iter.first: 4 , Iter.second: New Mexico
Iter.first: 5 , Iter.second: Nevada
Iter.first: 6 , Iter.second: Arizona
