Creating a map to store user objects - C++ STL

C++ examples for STL:map

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Description

Creating a map to store user objects

Demo Code

#include <cinttypes>
#include <functional>
#include <iostream>
#include <map>
#include <string>

using namespace std;

class MapObject/*from  ww  w .  j  av  a  2  s  .c  o  m*/
{
private:
    string m_Name;

public:
    MapObject(const string& name)
        : m_Name{ name }
    {

    }

    const string& GetName() const
    {
        return m_Name;
    }
};

int main(int argv, char* argc[])
{
    map<int32_t, MapObject, greater<int32_t>> myMap
    {
        pair<int32_t, MapObject>(6, MapObject("Six")),
        pair<int32_t, MapObject>(3, MapObject("Three")),
        pair<int32_t, MapObject>(4, MapObject("Four")),
        pair<int32_t, MapObject>(1, MapObject("One")),
        pair<int32_t, MapObject>(2, MapObject("Two"))
    };

    for (auto&& number : myMap)
    {
        cout << number.second.GetName() << endl;
    }

    cout << endl;

    myMap.emplace(pair<int32_t, MapObject>(5, MapObject("Five")));

    for (auto&& number : myMap)
    {
        cout << number.second.GetName() << endl;
    }

    cout << endl;

    auto iter = myMap.find(3);
    if (iter != myMap.end())
    {
        cout << "Found: " << iter->second.GetName() << endl;
    }

    return 0;
}

Result


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