不确定如何在头文件中实现可访问的枚举？

Question

In a header file I have something basically like this

#ifndef blah
#define blah

enum DataType
{
    TextData,
    IntData

};


#endif

And in another file I have

#include "previousheaderdefinedabove"

int main(int argc, char *argv[])
{
    std::cout << DataType::TextData;


    return 1;
}

However, when I try to compile I get

main.cpp:13:18: error: expected a class or namespace
    std::cout << DataType::TextData;

Not sure what I'm doing wrong, any help is much appreciated! I've seen enums being used as classes but is there a reason why the namespcae isn't enough?

Answer 1

The enum is neither a namespace nor a class; its values are in the same scope as the definition. In the above example, the enum values are in the global namespace.

That means, in main, you should have

std::cout << TextData;

instead of

std::cout << DataType::TextData;