Is there a better way to insert an enum into a set without macros?

Question

I created an enum for a class and in the constructor I inserted all the enum values into a set. I am wondering if there is a better way anyone can recommend. I feel like there should be, but have been unable to think of one or find one online. I wrote the code in C++ and am using the Boost libraries.

Here is the enum:

class CreateAndUseIniFile {
 std::set<CreateAndUseIniFile::iniFileValues> m_modules;
 enum iniFileValues {
 FIXED_VOLTAGE1,
 FIXED_VOLTAGE2,
 FIXED_VOLTAGE3,
 FIXED_VOLTAGE4
 }
}

and this is the constructor where I add the values

CreateAndUseIniFile::CreateAndUseIniFile() {
 m_modules.insert(CreateAndUseIniFile::FIXED_VOLTAGE1);
 m_modules.insert(CreateAndUseIniFile::FIXED_VOLTAGE2);
 m_modules.insert(CreateAndUseIniFile::FIXED_VOLTAGE3);
 m_modules.insert(CreateAndUseIniFile::FIXED_VOLTAGE4);
} 

• Michael Urman: Like the fellow asking codereview.stackexchange.com/q/35208/32004 it sounds like you might be looking for n3815 to become real.

Answer 1

You can iterate over the enum and insert each one individually.

for ( int i = FIXED_VOLTAGE1; i != FIXED_VOLTAGE4; i++ )
{
 m_modules.insert(CreateAndUseIniFile::static_cast<iniFileValues>(i));
}

Note: This will work with your specific case... don't do this if you have enums with set values that contain gaps between enum values.

• Aaron: Thanks, for some reason I thought I couldn't iterate though an enum
• BenVlodgi: @Aaron No problem. enums are basically just fancy ints. They should only be iterated through during controlled situations like yours.

Answer 2

As an alternative, you can use Boost Assignment Library. Then you will get something like this:

#include <boost/assign/list_of.hpp>
#include <set>
class CreateAndUseIniFile {
public:
 enum iniFileValues {
 FIXED_VOLTAGE1,
 FIXED_VOLTAGE2,
 FIXED_VOLTAGE3,
 FIXED_VOLTAGE4
 };
 CreateAndUseIniFile() {
 m_modules =
 boost::assign::list_of
 (FIXED_VOLTAGE1)
 (FIXED_VOLTAGE2)
 (FIXED_VOLTAGE2)
 (FIXED_VOLTAGE3)
 (FIXED_VOLTAGE4);
 }
 std::set<CreateAndUseIniFile::iniFileValues> m_modules;
};