Using unordered_map - C++ STL

C++ examples for STL:unordered_map

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Description

Using unordered_map

Demo Code

#include <cinttypes>
#include <iostream>
#include <string>
#include <unordered_map>

using namespace std;

class MapObject//from  w w w.ja  v a 2 s  .co 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[])
{
    unordered_map<int32_t, MapObject> myMap;
    myMap.emplace(pair<int32_t, MapObject>(5, MapObject("Five")));
    myMap.emplace(pair<int32_t, MapObject>(3, MapObject("Three")));
    myMap.emplace(pair<int32_t, MapObject>(4, MapObject("Four")));
    myMap.emplace(pair<int32_t, MapObject>(1, MapObject("One")));
    myMap.emplace(pair<int32_t, MapObject>(2, MapObject("Two")));

    cout << showbase << hex;

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

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

    return 0;
}

Result


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