'for each' is not a member of std. C++11 support already enabled

Question

The code from my professor's homework assignment is as follows. This is straight out of the box, I have not modified my professor's code. There is more to the program, but this is where the error happens. Problem line in bold.

std::cout << "\nAll remaining courses with enrollments:\n";
allCourses = WSUCourse::getAllCourses();
std::for_each(
  allCourses.begin(),
  allCourses.end(),
  WSUCoursePrinter());

I receive the following error.

g++    -c -g -std=c++11 -MMD -MP -MF "build/Debug/Cygwin_4.x-Windows/main.o.d" -o build/Debug/Cygwin_4.x-Windows/main.o main.cpp
main.cpp: In member function 'void WSUStudentPrinter::operator()(const WSUStudent*)':
main.cpp:26:20: error: 'to_string' is not a member of 'std'
       std::cout << std::to_string(studentPtr->getUniqueID()) <<
                    ^
main.cpp: In function 'void test()':
main.cpp:162:4: error: 'for_each' is not a member of 'std'
    std::for_each(
    ^
main.cpp:174:4: error: 'for_each' is not a member of 'std'
    std::for_each(
    ^
nbproject/Makefile-Debug.mk:84: recipe for target 'build/Debug/Cygwin_4.x-Windows/main.o' failed

To summarize it, it's exactly like the title. "'For each' is not a member of std" I have already enabled standard 11 support in all the IDE's I have compiled it in. On code blocks I put the argument in the compiler settings, in netbeans I changed it under project properties on the compiler, even the linux system on the school's network won't run it, with the same error, and I used the standard 11 inclusion line.

Ideas on how to fix this, anyone? It used to give me the same error for all locations.

Answer 1

After being confirmed from the comment:

You forgot to include #include<algorithm>. Include the required header to make the symbol foreach included in std namespace and thus visible for the rest of the program.

Answer 2

Your solution is purely C++98, a possible C++11 solution would look like that:

std::cout << "\nAll remaining courses with enrollments:\n";
for (auto & course : WSUCourse::getAllCourses())
{
    //whatever WSUCoursePrinter does.
    course.print() ;
}

I like this way a lot more and it doesn't need the algorithm header.