foreach not recognized in C++

Question

In my the cs106b book we use the expression \"foreach\" to go through a list of words in a Map. I implemented the code and banged my head against the wall facing mysterious erro

Answer 1

Qt is support foreach, using like this:

QDir dir("Dir");
dir=QFileDialog::getExistingDirectory(0,"Select Folder: ");
QFileInfoList list = dir.entryInfoList(QDir::Dirs| QDir::Files | QDir::NoDotAndDotDot);

std::vector<std::string> names;
foreach(QFileInfo finfo, list){
    std::string str=dir.path().toStdString().c_str();
    str=str+"/";
    names.push_back(str+finfo.fileName().toStdString().c_str());
}

but, when you using #define QT_NO_KEYWORDS on header file, foreach disabled.

Answer 2

Because the function name is for_each P.S. I thought it was a c++ question, as the tag suggested, but the syntax all wrong for C++.

Answer 3

The code in your example looks like a mix of C# and C++ syntax. The foreach construct itself is C# syntax, C++/CLI (supported by VC++) has a for each construct as does C++0x (supported by GCC 4.6), but neither followw that syntax.

Answer 4

I suggest for_each.

Answer 5

foreach doesn't exist in C++.

In the latest version of C++ which is only just released in some of the latest compilers, you can use "Range-based for-loop" .. find it on this page: http://en.wikipedia.org/wiki/C%2B%2B0x

I doubt though that your compiler supports that. So, maybe stick with a for loop for now.

Answer 6

Try iterating through the size of the map.

for(int i=0;i<MAP.size();++i)
    // something with MAP.at(i);

Replace MAP with your map object.

Good luck!

Regards,
Dennis M.