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#include <string>
#include <iostream>
using std::cerr;
using std::endl;
class Command
{
public:
enum Value
{
HELP = 0,
VERSION,
DEFAULT
};
Command (Value v = Command::DEFAULT)
: v_ (v)
{
}
operator Value () const
{
return v_;
}
friend std::ostream&
operator<< (std::ostream& os, Command c);
friend std::istream&
operator>> (std::istream& is, Command& c);
private:
Value v_;
static char* labels_[];
};
char* Command::labels_[] = {"help", "version", "default"};
std::ostream&
operator<< (std::ostream& os, Command c)
{
return os << Command::labels_[c.v_];
}
std::istream&
operator>> (std::istream& is, Command& c)
{
std::string s;
is >> s;
if (is)
{
if (s == Command::labels_[Command::HELP]) c.v_ = Command::HELP;
else if (s == Command::labels_[Command::VERSION]) c.v_ = Command::VERSION;
else is.setstate (std::ios::failbit);
}
return is;
}
int
main ()
{
Command c = Command::HELP;
c = Command::DEFAULT;
Command c1 (Command::HELP);
c = c1;
cerr << c << endl;
switch (c)
{
case Command::HELP:
{
cerr << "iiihuuu!!!" << endl;
}
}
std::cin >> c1;
if (std::cin) cerr << c1 << endl;
else cerr << "*failed" << endl;
}
//$Id$
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