Спринт 6. Измеряем и ускоряем.

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log_duration.h
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#pragma once

#include <chrono>
#include <iostream>

#define PROFILE_CONCAT_INTERNAL(X, Y) X##Y
#define PROFILE_CONCAT(X, Y) PROFILE_CONCAT_INTERNAL(X, Y)
#define UNIQUE_VAR_NAME_PROFILE PROFILE_CONCAT(profileGuard, __LINE__)
#define LOG_DURATION(x) LogDuration UNIQUE_VAR_NAME_PROFILE(x)

class LogDuration {
public:
    using Clock = std::chrono::steady_clock;

    LogDuration(const std::string& id) : id_(id) {
    }

    ~LogDuration() {
        using namespace std::chrono;
        using namespace std::literals;

        const auto end_time = Clock::now();
        const auto dur = end_time - start_time_;
        std::cerr << id_ << ": "s << duration_cast<milliseconds>(dur).count() << " ms"s << std::endl;
    }
private:
    const std::string id_;
    const Clock::time_point start_time_ = Clock::now();
};
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main.cpp
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#include "log_duration.h"

#include <algorithm>
#include <chrono>
#include <cstdlib>
#include <iostream>
#include <vector>

using namespace std;

vector<int> ReverseVector(const vector<int>& source_vector) {
    vector<int> res;

    for (int i : source_vector) {
        res.insert(res.begin(), i);
    }

    return res;
}

vector<int> ReverseVector2(const vector<int>& source_vector) {
    vector<int> res;

    for (auto iterator = source_vector.rbegin(); iterator != source_vector.rend(); ++iterator) {
        res.push_back(*iterator);
    }

    return res;
}

vector<int> ReverseVector3(const vector<int>& source_vector) {
    return {source_vector.rbegin(), source_vector.rend()};
}

vector<int> ReverseVector4(const vector<int>& source_vector) {
    vector<int> res;
    res.reserve(source_vector.size());
    res = {source_vector.rbegin(), source_vector.rend()};
    return res;
}

void Operate() {
    vector<int> rand_vector;
    int n;

    cin >> n;
    rand_vector.reserve(n);

    for (int i = 0; i < n; ++i) {
        rand_vector.push_back(rand());
    }

    if(rand_vector.size()<=100000){

        {
            LOG_DURATION("Naive"s);
            ReverseVector(rand_vector);
        }

        {
            LOG_DURATION("Good"s);
            ReverseVector2(rand_vector);
        }

    }else{

        {
            LOG_DURATION("Good"s);
            ReverseVector2(rand_vector);
        }

        {
            LOG_DURATION("Best"s);
            ReverseVector3(rand_vector);
        }

        {
            LOG_DURATION("Your"s);
            ReverseVector4(rand_vector);
        }

    }

}

int main() {
    Operate();
    return 0;
}