Classifier

A Classifier collects statistical information over a set of test cases, namely the number of trivial test cases and the distribution of categories. A category is a set of tags (represented as strings).

Classifier

Note: although it is a general concept, [[check]] accepts only the standard classifier due to issues with template deduction.

concept Classifier {
  template <typename... Args>
  void check(const std::tuple<Args...>& args);

  size_t trivial() const;
  distribution distro() const;
};

classifier

template <typename... Args>
class classifier {
  public:
    classifier& trivial(bool predicate(const Args&...));
    classifier& classify(bool predicate(const Args&...), const std::string& label);
    template <typename T>
    classifier& collect(T tagger(const Args&...));

    template <typename... Args>
    void check(const std::tuple<Args...>& args);

    size_t trivial() const;
    distribution distro() const;
};

• classifier& trivial(bool predicate(const Args&...));

  Sets the predicate that returns true for trivial test cases. Returns *this for chaining. This function can be called multiple times, but only the last predicate will be kept.

• classifier& classify(bool predicate(const Args&...), const std::string& tag);

  Adds a classifier for a single tag. If the predicate returns true, the tag is included in the test case's category.

• template <typename T> classifier& collect(T tagger(const Args&...));

  Adds a classifier. The tagger should generate a value based on the test case. If the value is not a string, it will be converted to one using the output stream operator.