code example, C++ (gcc)

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#include <iostream>
#include <memory>
#include <vector>
#include <algorithm>

struct Enemy
{
    static unsigned id;
    unsigned m_id;
    bool hit;
    
    Enemy() : hit(false),m_id(id++)
    {}
    
    void kill()
    {
        std::cout<< "Killing Enemy >> "<<m_id <<std::endl;
    }
    
    ~Enemy()
    {
        std::cout<< "Deleting Enemy >>"<<m_id <<std::endl;
    }
};
unsigned Enemy::id = 0;

int main()
{
    std::vector<std::unique_ptr<Enemy> > enemies;
    
    for (unsigned i=0; i<10; ++i)
        enemies.emplace_back(std::unique_ptr<Enemy>(new Enemy()));
    
    enemies[6]->hit = true;
    
    std::cout<< "Before : "<<enemies.size() <<std::endl;
    for (const auto &i : enemies)
        std::cout<< i->m_id <<" ";
    std::cout<<std::endl;
    
    if (!enemies.empty())
    {
        /*//classic iterator for-loop
        for (auto itr = std::begin(enemies); itr!=std::end(enemies); ++itr)
        {
            if ((*itr)->hit)
            {
                (*itr)->kill();
                enemies.erase(itr);
            }
        }
        */
        
        //remove_if + lambda
        enemies.erase(std::remove_if(enemies.begin(),enemies.end(),[](const auto &itr){return itr->hit;}),std::end(enemies));        
        
        
        /*// while-loop
        auto itr = std::begin(enemies);
        while (itr != std::end(enemies))
        {
            if ((*itr)->hit)
            {
                (*itr)->kill();
                enemies.erase(itr);
            }
            ++itr;
        }
        */
    }
    
        
    std::cout<< "After : "<<enemies.size() <<std::endl;
    for (const auto &i : enemies)
        std::cout<< i->m_id <<" ";
    std::cout<<std::endl;
    
    std::cout<<std::endl<< "--- Deleting all remaining objects ---" <<std::endl;
}

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Compilation time: 0.92 sec, absolute running time: 0.14 sec, cpu time: 0 sec, memory peak: 3 Mb, absolute service time: 1,06 sec