Converting from a std::string to bool

I am surprised that no one mentioned this one:

bool b;
istringstream("1") >> b;

bool b;
istringstream("true") >> std::boolalpha >> b;

bool to_bool(std::string const& s) {
     return s != "0";
}

It'll probably be overkill for you, but I'd use boost::lexical_cast

boost::lexical_cast<bool>("1") // returns true
boost::lexical_cast<bool>("0") // returns false

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