foreach not recognized in C++

c++11 foreach
error: ‘for_each’ is not a member of ‘std’
for each loop c++
c for_each
for_each identifier not found
std for_each insert
c++ functional for_each
std::for_each return value

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 errors. Here's the code:

   void DisplayWordCounts(Map<int> & wordsCount) {
     foreach (string word in wordsCount) {
        cout << left << setw(15) << word << right << setw(5)
        << wordsCount[word] << endl;
     }
}

on the line starting with "foreach" I get the following errors: lesson4-macbeth/life.cpp:58: error: expected primary-expression before 'word' lesson4-macbeth/life.cpp:58: error: 'foreach' was not declared in this scope lesson4-macbeth/life.cpp:58: error: expected `;' before '{' token

I guess foreach is not recognized. In that case, how can I go through a list of items from the Map class?

foreach is not a standard C++ feature. This was something Eric Roberts and I developed for the Stanford introductory programming sequence and predates the more modern C++11 range-based for loop. Now that C++11 compiler support is more widespread, we've stopped using foreach and just opted to go with the standard C++ enhanced for loop.

I would generally not advice using foreach going forward as it's nonstandard. However, if you're compiling older code that uses it, you'll need to include one of the header files from the Stanford C++ Libraries that defines it.

Foreach loop, I've got trouble while trying to use <c:forEach> JSTL Tag in my JSP. And all I have got is ${myValue} displayed on the screen but not the values I want ! At any point within the foreach statement block, you can break out of the loop by using the break statement, or step to the next iteration in the loop by using the continue statement. You can also exit a foreach loop by the goto, return, or throw statements. If the foreach statement is applied to null, a NullReferenceException is thrown.

I suggest for_each.

JSTL forEach with arrayList - Forums, $sourceFile = "C:\temp\file.bat" foreach ($username in $usernames) "Copy to $​destination Failed" } } else { Write-Host "$destination Does Not  foreach is not a standard C++ feature. This was something Eric Roberts and I developed for the Stanford introductory programming sequence and predates the more modern C++11 range-based for loop. This was something Eric Roberts and I developed for the Stanford introductory programming sequence and predates the more modern C++11 range-based for loop.

What book are you using?

foreach is not a C++ keyword, and I think the closest extension that introduces it, with that specific syntax, into the language is in Visual C++, as described in this link: http://blogs.msdn.com/b/arich/archive/2004/09/08/227139.aspx

There is for_each in <algorithm>, but its signature is very different from what you're using (which is a very Java for-each syntax).

Also I notice that you're using Map which is different from std::map?

Powershell foreach statement not working, employee list has List of Employee. Inner forEach loop is not printing the employee first name, employee last name and city in each iteration. ? Among PowerShell errors, term not recognized is commonly dismissed as a spelling error, but there can be so many other causes beyond just a misspelled cmdlet. Path errors, incorrect function scopes, and missing modules can all sometimes cause this error to occur.

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++.

c:forEach not iterating over object fields (JSP forum at Coderanch), while if it's anywhere else, it'll be recognized as the ForEach-Object cmdlet/​command. You can not specify a type for the variable in a foreach loop. PS C​:\> foreach ($Integer in 1..50) { if ( -not ($Integer % 10) ) { "$Integer is like totally  If that module is missing, corrupt or has been moved, it can throw up the ‘the term is not recognized as the name of a cmdlet’ error. You can use ‘get-module’ in PowerShell to see if the module is present and correct. It will show you what modules are loaded and you can add or repair depending on your needs. Using PowerShell in Windows

foreach is not a construct in C++!

PowerShell foreach loops and ForEach-Object, JSTL core tags: c:forEach - syntax, description and code examples. We use <c:​forEach> to iterate over a collection of objects and display their values. The objects can be POJOs or plain ${not status.last ? '< hr />' : '< br />'}. Copy-Item : Could not find a part of the path 'c:\users\ Public\AppData\Roaming\Micros oft\Windows\Start Menu\Programs\Startup' So i realized that all the space between c:\users\ and Public was just white space.

JSTL Core Tag c:forEach Example, The PowerShell 'ForEach' loop is more complex, and has more arguments than the 'for' I chose the root of the C: drive simply because I want this example script to work I have not found it possible to pipe input into loops. The answer is that Point is a value type, and the default value for a Point is (0,0), not null. Failure to recognize this is a very easy (and common) mistake to make in C#. Many (but not all) value types have an IsEmpty property which you can check to see if it is equal to its default value: Console.WriteLine(point1.IsEmpty); // True

PowerShell Basics: ForEach Loop & -object cmdlet, The gross contractual amountsreceivable c. The amounts recognized asofthe acquisition dateforeach major class of assetsacquired and liabilities assumed 10​  Beginning with C# 8.0, you can use the await foreach statement to consume an asynchronous stream of data. For more information, see the foreach statement article and the Asynchronous streams section of the What's new in C# 8.0 article. The type of expression await t is TResult if the type of expression t is Task<TResult> or ValueTask<TResult>.

Wiley Not-for-Profit GAAP 2013: Interpretation and Application of , foreach(range()) whilst efficiant in other languages, such as python, it is not The function "range" is very useful to get an array of characters as range('C','R') does. print_r(myRange( "5", "9" )); //numbers are detected even if hidden in strtings

Comments
  • Please tell us the name of this book so we can avoid it better.
  • are you trying to compile c# code in c++?
  • @Everyone- This is a special macro that's provided in Stanford's introductory programming courses CS106B and CS106X. We also provide a custom Map class that's easier to use than the STL map; hence the capitalization.
  • @templatetypedef - thanks for clarification. In that case this question seems way too localized since it's so curriculum specific.
  • You have to question the wisdom of synthesising a construct that does not exist in a language without making it very clear to the student that they are not learning C++, but some construct invented for teaching programming in a more abstract sense. Also since the construct appears to be copied directly from C#, what is wrong with using C# for this course?
  • @Oli Charlesworth- There wasn't anything wrong per se with anything in C++. The main advantage was simplicity - it's much easier to focus on more advanced ideas like recursion, linked lists, graphs, and asymptotic analysis if you don't have to introduce complex iterator syntax to look at everything in a map/set/etc. The curriculum will probably soon be updated to go over STL containers at the end of the course, meaning that foreach will likely be "training wheels" to simplify the material.
  • Why would you have done such an evil thing!? If you want to teach such a construct, why not use a language that supports it directly. It reminds me of the CS graduates I used to come across who, faced with having to use C in the real world, would #define { and } as BEGIN and END to make thier code a bit more Pascal-like!
  • @Clifford- The point of these courses is to get students up to speed on language-agnostic concepts like recursion, data structures, inheritance, etc. rather than to produce hardcore C++ programmers. There are other courses that focus on the specifics of C++ and other programming languages. From experience this setup actually works quite well, since students usually take it upon themselves to learn the nuances of their favorite languages. I'd prefer not to get into an argument about this since I don't think anyone's going to change their mind, but you do have a very good point.
  • C++ was an interesting choice for teaching data structures whilst trying to ignore language-specific details!
  • @templatetypedef: I realise that, but this student does not apper to have had that made clear to him, and thinks that he is learning C++. I used to be a regular on a forum where similar problems occurred perennially with US students who learned C++ on the AP Computer Science programme; some of them appeared to have made it to the workplace before finding out the courseware class libraries they'd learned were unavailable outside acedemia.
  • Well it is. But you can't use it like that.
  • Using an iterator would be a closer match to the foreach construct, though the syntax is somewhat cumbersome perhaps.
  • Maps aren't indexed like that. Use an iterator.