问如何将字符串转换为同名变量的值？

EN

// #include <csignal>
#define SIGINT     2  // interrupt
#define SIGILL     4  // illegal instruction - invalid function image
#define SIGFPE     8  // floating point exception
#define SIGSEGV   11  // segment violation
#define SIGTERM   15  // Software termination signal from kill
#define SIGBREAK  21  // Ctrl-Break sequence
#define SIGABRT   22  // abnormal termination triggered by abort call

constexpr
std::pair<int, std::string_view>  sig_mapping [] {
    {SIGINT,   "SIGINT"},
    {SIGILL,   "SIGILL"},
    {SIGFPE,   "SIGFPE"},
    {SIGSEGV,  "SIGSEGV"},
    {SIGTERM,  "SIGTERM"},
    {SIGBREAK, "SIGBREAK"},
    {SIGABRT,  "SIGABRT"},
};

template<int SIZE>
constexpr
int StringToValue( const char (&STR) [SIZE] )
{
    for( auto &&i : sig_mapping ) {
        if( i.second == STR )  return i.first;
    }
    return 0;
}

int main()
{
    constexpr auto
        sigunknown { StringToValue("UNKNOWN") },
        sigint     { StringToValue("SIGINT") },
        sigill     { StringToValue("SIGILL") },
        sigfpe     { StringToValue("SIGFPE") },
        sigsegv    { StringToValue("SIGSEGV") },
        sigterm    { StringToValue("SIGTERM") },
        sigbreak   { StringToValue("SIGBREAK") },
        sigabort   { StringToValue("SIGABRT") }
    ;
    return 0;
}