A quick way of transforming an Enum to string inC++

enum-to-str.hpp

// Type your code here, or load an example.
#include <stdio.h>

#include <string>
struct Str
{
    const char* base;
    size_t len;

    operator std::string() const
    {
        return std::string(base, base+len);
    } 
};
template<typename T, const T V>
constexpr Str enum_to_str_impl() 
{
    const char* v=  __PRETTY_FUNCTION__;

    while(*v != ';' && *v != ','&& *v != 0)
    {
        v++;
    }
    while(*v != '=' && *v != 0)
    {
        v++;
    }
    v++; // escape '='
    v++; // escape ' ' 

    Str s = (Str){
        .base = v,
        .len = 0 
    };
    int l = 0;
    while(*v != 0 && *v != ']')
    {
        v++;
        l++;
    }

    s.len = l;
    return s;
};




#define mdef$(t, v) enum_to_str_impl<t, static_cast<t>(v)>()

#define mdefc$(t, v) enum_to_str_impl<t, static_cast<t>(v)>(),



#define mloop1_5(x, t, v) x(t,v + 0) x(t,v+1) x(t,v+2) x(t,v+3) x(t,v+4) 
#define mloop2_5(x, t, v) mloop1_5(x,t,(v)*5 + 0) mloop1_5(x,t,(v+1)*5) mloop1_5(x,t,(v+2)*5) mloop1_5(x,t,(v+3)*5) mloop1_5(x,t,(v+4)*5) 
#define mloop3_5(x, t, v) mloop2_5(x,t,(v)*5 + 0) mloop2_5(x,t,(v+1)*5) mloop2_5(x,t,(v+2)*5) mloop2_5(x,t,(v+3)*5) mloop2_5(x,t,(v+4)*5) 
#define mloop4_5(x, t, v) mloop3_5(x,t,(v)*5 + 0) mloop3_5(x,t,(v+1)*5) mloop3_5(x,t,(v+2)*5) mloop3_5(x,t,(v+3)*5) mloop3_5(x,t,(v+4)*5) 
#define mloop5_5(x, t, v) mloop4_5(x,t,(v)*5 + 0) mloop4_5(x,t,(v+1)*5) mloop4_5(x,t,(v+2)*5) mloop4_5(x,t,(v+3)*5) mloop4_5(x,t,(v+4)*5) 
 template<typename T> \
    constexpr Str enum_to_str(T value) {
            return (Str){ \
                "",  
                0 
            }; 
    };

#define enum2str_def125$(t) \
    template<> \
    constexpr Str enum_to_str<t>(t value) {\
        constexpr Str v[] = {mloop4_5(mdefc$, t, 0)};\
        if(value > sizeof(v) / sizeof(v[0])) \
        {\
            return (Str){ \
                "",  \
                0 \
            }; \
        } \
        return v[static_cast<int>(value)]; \
    };
#define enum2str_def625$(t) \
    template<> \
    constexpr Str enum_to_str<t>(t value) {\
        constexpr Str v[] = {mloop4_5(mdefc$, t, 0)};\
        if(value > sizeof(v) / sizeof(v[0])) \
        {\
            return (Str){ \
                "",  \
                0 \
            }; \
        } \
        return v[static_cast<int>(value)]; \
    };
#define enum2str_def3125$(t) \
    template<> \
    constexpr Str enum_to_str<t>(t value) {\
        constexpr Str v[] = {mloop5_5(mdefc$, t, 0)};\
        if(value > sizeof(v) / sizeof(v[0])) \
        {\
            return (Str){ \
                "",  \
                0 \
            }; \
        } \
        return v[static_cast<int>(value)]; \
    };

#define enum2str_def$(t) enum2str_def625$(t)  

enum Colors : int
{
    NONE,
    RED,
    BLUE
};
enum2str_def$(Colors);

/*

void print_str(Str v){
for(int i = 0; i < v.len; i++)
    {
        
        printf("%c", v.base[i]);
    }
    
}
int main() 
{
    Str v = mdef$(Colors, 1);

    for(int i = 0; i < 69; i++)
    {
        printf("%i = ", i);
        print_str(enum_to_str<Colors>(static_cast<Colors>(i)));
        printf("\n");
    }
    
    
    printf("\n");
    return 0;
}
*/