入れ子クラスとローカルクラス　解答ページ | Programming Place Plus　C++編【言語解説】　第２４章

const Student::Score SCORES[] = {
    Student::Score(90, 60, 71),
    Student::Score(84, 70, 65),
    Student::Score(92, 67, 73),
};

#include <cassert>
#include <iostream>
#include <string>
#include <vector>

#define SIZE_OF_ARRAY(array) (sizeof(array)/sizeof(array[0]))

class Student {
public:
    class Score {
    public:
        Score(int japanese, int math, int english);

    public:
        int GetAverage() const;

    private:
        enum Subject {
            SUBJECT_JAPANESE,
            SUBJECT_MATH,
            SUBJECT_ENGLISH,

            SUBJECT_NUM,  // 総数を表すダミー
        };

    private:
        int  mScores[SUBJECT_NUM];
    };

    typedef std::vector<Score>  Scores_t;

    static const int SCORE_DATA_NUM = 3;

public:
    Student(const std::string& name, const Scores_t& scores) :
        mName(name),
        mScores(scores)
    {
        assert(mScores.size() == SCORE_DATA_NUM);
    }

public:
    inline const std::string& GetName() const
    {
        return mName;
    }

    inline const Score& GetScore(int term) const
    {
        assert(0 <= term && term < SCORE_DATA_NUM);
        return mScores[term];
    }

private:
    const std::string  mName;
    const Scores_t     mScores;
};

Student::Score::Score(int japanese, int math, int english)
{
    mScores[SUBJECT_JAPANESE] = japanese;
    mScores[SUBJECT_MATH] = math;
    mScores[SUBJECT_ENGLISH] = english;
}

int Student::Score::GetAverage() const
{
    int sum = 0;
    for (int i = 0; i < SIZE_OF_ARRAY(mScores); ++i) {
        sum += mScores[i];
    }
    return sum / SIZE_OF_ARRAY(mScores);
}


int main()
{
    const Student::Score SCORES[Student::SCORE_DATA_NUM] = {
        Student::Score(90, 60, 71),
        Student::Score(84, 70, 65),
        Student::Score(92, 67, 73),
    };

    Student student("Tanaka Miki", Student::Scores_t(SCORES, SCORES + Student::SCORE_DATA_NUM));

    std::cout << "Name: " << student.GetName() << "\n"
        << "  1st term Average: " << student.GetScore(0).GetAverage() << "\n"
        << "  2nd term Average: " << student.GetScore(1).GetAverage() << "\n"
        << "  3rd term Average: " << student.GetScore(2).GetAverage() << std::endl;
}

#include <iostream>

int main()
{
    class Printer {
    public:
        static void Puts(const char* str, const char* begin = "", const char* end = "")
        {
            std::cout << begin << str << end << std::endl;
        }
    };

    Printer::Puts("Test Message1");
    Printer::Puts("Test Message2", "[[", "]]");
    Printer::Puts("Test Message3", "[[", "]]");
}