Is there a simple way to convert C++ enum to string?

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我在风中等你 2020-11-22 10:37

Suppose we have some named enums:

enum MyEnum {
      FOO,
      BAR = 0x50
};

What I googled for is a script (any language) that scans all

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無奈伤痛 (楼主)

2020-11-22 11:06

Interesting to see the number of ways. here's one i used a long time ago:

in file myenummap.h:

#include 
#include 
enum test{ one, two, three, five=5, six, seven };
struct mymap : std::map
{
  mymap()
  {
    this->operator[]( one ) = "ONE";
    this->operator[]( two ) = "TWO";
    this->operator[]( three ) = "THREE";
    this->operator[]( five ) = "FIVE";
    this->operator[]( six ) = "SIX";
    this->operator[]( seven ) = "SEVEN";
  };
  ~mymap(){};
};

in main.cpp

#include "myenummap.h"

...
mymap nummap;
std::cout<< nummap[ one ] << std::endl;

Its not const, but its convenient.

Here's another way that uses C++11 features. This is const, doesn't inherit an STL container and is a little tidier:

#include 
#include 
#include 
#include 

//These stay together and must be modified together
enum test{ one, two, three, five=5, six, seven };
std::string enum_to_str(test const& e)
{
    typedef std::pair mapping;
    auto m = [](test const& e,std::string const& s){return mapping(static_cast(e),s);}; 
    std::vector const nummap = 
    { 
        m(one,"one"), 
        m(two,"two"), 
        m(three,"three"),
        m(five,"five"),
        m(six,"six"),
        m(seven,"seven"),
    };
    for(auto i  : nummap)
    {
        if(i.first==static_cast(e))
        {
            return i.second;
        }
    }
    return "";
}

int main()
{
//  std::cout<< enum_to_str( 46 ) << std::endl; //compilation will fail
    std::cout<< "Invalid enum to string : [" << enum_to_str( test(46) ) << "]"<