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include <set>;
include <map>;
include <vector>;
include <string>;
// We can place the options classes into namespaces which mapped to C++
// namespaces.
//
namespace features
{
class options
{
// We can have several aliases for the same option. The first one is used
// to derive the accessor name.
//
std::string --out-dir | -o;
// We can use both assignment and constructor notations to provide the
// default option value.
//
std::string --first-name = "John";
std::string --last-name ("Mr John Doe", 8, 3);
// We can use containers to to collect option value. If we have a command
// line like this: -v 1 -v 2 -v 1 -s 1 -s 2 -s 1 then the vector returned
// by the vector() accessor will contain three elements: 1, 2, and 1 while
// the set returned by the set() accessor will contain two elements: 1 and
// 2.
//
std::vector<int> --vector | -v;
std::set<int> --set | -s;
// We can also use maps and multimaps. In this case the option value is
// expected to have two parts: the key and the value, separated by '='.
// For example: -m a=1 -m =true -m c= -m d (same as -m d=).
//
std::map<std::string, bool> --map | -m;
std::multimap<std::string, int> --multimap;
};
}
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