cpp_map - 8BitsCoding/RobotMentor GitHub Wiki

#include <map>

int main() {
    std::map<std::string, int> simpleScoreMap;

    simpleScoreMap.insert(std::pair<std::string, int>("Mocha", 100));
    simpleScoreMap.insert(std::pair<std::string, int>("CoCo", 50));

    simpleScoreMap["Mocha"] = 0;

    std::cout << "Current size: " << simpleScoreMap.size() << std::endl;
}

// 함수의 원형은 다음과 같다.
std::pair<iterator, bool> insert(const value_type& value)

// <iterator, true> 반환
simpleScoreMap.insert(std::pair<std::string, int>("Mocha", 100));

// <iterator, false> 반환
simpleScoreMap.insert(std::pair<std::string, int>("Mocha", 50));

std::map<std::string, int> simpleScoreMap;

simpleScoreMap["CoCo"] = 10;        // 새 요소 삽입
simpleScoreMap["CoCo"] = 50;        // "CoCo" 변경

value = simpleScoreMap["CoCo"];
// 다음과 같이 불러온다면 CoCo란 값이 있으면 불러와 지지만 없으면 기본값이 삽입되어 리턴된다.

simpleScoreMap.insert(std::pair<std::string, int>("Mocha", 100));
simpleScoreMap.insert(std::pair<std::string, int>("CoCo", 50));

for(std::map<std::string, int>::iterator it = simpleSocreMap.begin(); it != simpleSocreMap.end(); ++it)
{
    std::cout << "(" << it->first << "," << it->second << ")" << std::endl;
}

#include <map>

int main() {
    std::map<std::string, int> simpleScoreMap;
    simpleScoreMap.insert(std::pair<std::string, int>("Mocha", 100));

    std::map<std::string, int>::iterator it = simpleScoreMap.find("Mocha");
    if(it!=simpleScoreMap.end())
    {
        it->second = 80;
    }
    return 0;
}

std::map<std::string, int> scoreMap;
std::map<std::string, int> anotherScoreMap;

scoreMap.swap(anotherScoreMap);

anotherScoreMap.clear();

std::map<std::string, int>::iterator foundIt = SimpleScoreMap.find("CoCo");
SimpleScoreMap.erase(foundIt);

SimpleScoreMap.erase("CoCo");

class StudentInfo
{
public:
    // 생성자
private:
    std::string mName;
    std::string mStuentID;
}

int main() {
    std::map<StudentInfo, int> Scores;

    Scores.insert(std::pair<StudentInfo, int>(StudentInfo("Poppoy", "a556"), 30));
}

bool StudentInfo::opertor<(const StudentInfo& other) const
{
    if(mName == other.mName)
    {
        // 이름이 같은경우는 학번으로 정렬
        return mStudentID < other.mStudentID;
    }

    // 디폴트는 이름으로 정렬
    return mName < other.mName;
}

struct StudentInfoComaparer
{
    bool operator()(const StudentInfo& left, const StudentInfo& right) const
    {
        return (left.getName() < right.getName());
    }
};

std::map<StudentInfo, int, StudentInfoComparer> Scores;