observation.h

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#ifndef META_OBSERVATION_H_
#define META_OBSERVATION_H_

#include <string>
#include <vector>

#include "meta.h"
#include "util/identifiers.h"
#include "util/optional.h"

namespace meta
{
namespace sequence
{

MAKE_IDENTIFIER(symbol_t, std::string)
MAKE_IDENTIFIER(tag_t, std::string)
MAKE_IDENTIFIER(feature_id, uint64_t)

class observation
{
  public:
    using feature_vector = std::vector<std::pair<feature_id, double>>;

    observation(symbol_t sym, tag_t t);

    observation(symbol_t sym);

    const symbol_t& symbol() const;

    const tag_t& tag() const;

    const label_id& label() const;

    void symbol(symbol_t sym);

    void tag(tag_t t);

    void label(label_id lbl);

    bool tagged() const;

    const feature_vector& features() const;

    void features(feature_vector feats);

    class exception : public std::runtime_error
    {
      public:
        using std::runtime_error::runtime_error;
    };

  private:
    symbol_t symbol_;
    util::optional<tag_t> tag_;
    util::optional<label_id> label_;
    feature_vector features_;
};
}
}
#endif