Enum class only available with -std=c++11

Question

So I was trying to learn Enum classes. I copied this piece of code from my book:

#include <iostream>
using namespace std;
int main()
{
  enum class Color
  {
    RED,
    BLUE
  };

  Color color = Color::RED;

  if (color == Color::RED) 
    cout << "The color is red!\n";
  else if (color == Color::BLUE)
    cout << "The color is blue!\n";

  return 0;
}

I expect the code to print out "The Color is red!" However, my compiler gives this error:

warning: scoped enums only available with -std=c++11 or -std=gnu+11

and

error:'Color' is not a class or namespace

I'm currently using Dev-C++5.11. Any idea how to fix this?

Dev-C++ is a free IDE for Windows that uses either MinGW or TDM-GCC as underlying compiler. — CuriousAlpaca
– CuriousAlpaca, Commented Apr 3, 2016 at 3:52
How about adding -std=c++11 or -std=gnu+11 to the compiler arguments? — RamblingMad
– RamblingMad, Commented Apr 3, 2016 at 3:56

Mateen Ulhaq · Accepted Answer · 2016-04-03 03:59:48Z

1

Follow the instructions here to enable C++11 support.

Navigate to Tools -> Compiler Options
Settings tab
Code Generation tab
Change Language standard -std to C++11

answered Apr 3, 2016 at 3:59

Mateen Ulhaq

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1 Comment

Mateen Ulhaq Over a year ago

Also, consider trying out a modern IDE such as Visual Studio. ;)

ABu · Accepted Answer · 2016-04-03 05:14:28Z

Enum classes are a type of enums added to C++ in 2011. For this reason, you have to say to the compiler that you want to use that version of C++ (-std=c++11). Prior versions of C++, like C++03, hadn't that feature.

Dev-C++ uses internally gcc as compiler (g++ and gcc are synonyms), and probably the internal gcc version used by your Dev-C++ version is gcc 4.8.4 or even older, and at that times, the "default" C++ version was C++03 (03 means 2003). So, you have to inform gcc that your source code is written in C++11 with -std=c++11.

Modern versions of gcc or any other compiler assume by default that you are compiling C++11 code (or even, C++14 code), so, you can add that option to your old compiler or update your IDE to a version using C++11 as default.

AkaSh · Accepted Answer · 2016-04-03 04:03:38Z

In C++ 5.1enumerators in the same scope must all be distinct from each other and from other variable names.For example :

enum Color1 {
Bronze,
Silver,
Gold
};

enum Color2
{
Silver, //conflicts with Color1’s Silver
Gold,   //conflicts with Color1’s Gold 
};

C++ 11 solves the scoping problem with a new category called scoped enums.Keyword class appears between the keyword enum and the enum name.You are using C++ 5.1.Hence edit your code as follows:

#include <iostream>
using namespace std;
int main()
{
  enum Color
  {
    RED,
    BLUE
  };

  Color color =RED;

  if (color == RED) 
      cout << "The color is red!\n";
  else if (color == BLUE)
      cout << "The color is blue!\n";
  return 0;
}

https://ideone.com/v42Ihs

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