Sample code to demonstrate emplace_back operation of vector

emplace_back.cpp

// Sample code to demonstrate emplace_back operation of vector

#include <iostream>
#include <vector>

struct Creature
{
    Creature() : is_mammal_(false), age_(0), population_(0)
    {
        std::cout << "Default constructor called\n";
    }

    Creature(bool is_mammal, int age, int population)
        : is_mammal_(is_mammal), age_(age), population_(population)
    {
        std::cout << "3-arg constructor called\n";
    }

    bool is_mammal_;
    int age_;
    int population_;
};

typedef std::vector<Creature> CreatureVec;

int main()
{
    CreatureVec cv;
    cv.emplace_back(true, 10, 9999);
    cv.emplace_back();

    return 0;
}