怎样在C++中处理大数据集？

#include <memory>

class LargeData {
public:
    LargeData() { /* 初始化大数据 */ }
    ~LargeData() { /* 清理大数据 */ }
};

int main() {
    std::unique_ptr<LargeData> data = std::make_unique<LargeData>();
    // 使用data
    return 0;
}

#include <vector>
#include <algorithm>

void merge(std::vector<int>& arr, int left, int mid, int right) {
    std::vector<int> temp(right - left + 1);
    int i = left, j = mid + 1, k = 0;

    while (i <= mid && j <= right) {
        if (arr[i] <= arr[j]) {
            temp[k++] = arr[i++];
        } else {
            temp[k++] = arr[j++];
        }
    }

    while (i <= mid) {
        temp[k++] = arr[i++];
    }

    while (j <= right) {
        temp[k++] = arr[j++];
    }

    for (int p = 0; p < k; p++) {
        arr[left + p] = temp[p];
    }
}

void mergeSort(std::vector<int>& arr, int left, int right) {
    if (left < right) {
        int mid = left + (right - left) / 2;
        mergeSort(arr, left, mid);
        mergeSort(arr, mid + 1, right);
        merge(arr, left, mid, right);
    }
}

int main() {
    std::vector<int> data = { /* 你的大数据集 */ };
    mergeSort(data, 0, data.size() - 1);
    return 0;
}

#include <vector>
#include <thread>
#include <algorithm>

void processChunk(std::vector<int>& chunk) {
    std::sort(chunk.begin(), chunk.end());
}

int main() {
    std::vector<int> data = { /* 你的大数据集 */ };
    std::vector<std::thread> threads;
    std::vector<std::vector<int>> chunks;

    // 将数据分成多个chunk
    for (size_t i = 0; i < data.size(); i += chunkSize) {
        size_t end = std::min(i + chunkSize, data.size());
        chunks.push_back(std::vector<int>(data.begin() + i, data.begin() + end));
    }

    // 创建线程并处理每个chunk
    for (auto& chunk : chunks) {
        threads.emplace_back(processChunk, std::ref(chunk));
    }

    // 等待所有线程完成
    for (auto& thread : threads) {
        thread.join();
    }

    // 合并所有chunk
    data.clear();
    for (const auto& chunk : chunks) {
        data.insert(data.end(), chunk.begin(), chunk.end());
    }

    // 最后对整个数据集进行一次排序
    std::sort(data.begin(), data.end());

    return 0;
}

#include <fstream>
#include <vector>

int main() {
    std::vector<int> data = { /* 你的大数据集 */ };

    // 写入数据到文件
    std::ofstream outFile("data.bin", std::ios::binary);
    if (outFile.is_open()) {
        outFile.write(reinterpret_cast<const char*>(data.data()), data.size() * sizeof(int));
        outFile.close();
    }

    // 从文件读取数据
    std::ifstream inFile("data.bin", std::ios::binary);
    if (inFile.is_open()) {
        inFile.seekg(0, std::ios::end);
        std::streampos fileSize = inFile.tellg();
        inFile.seekg(0, std::ios::beg);

        std::vector<int> loadedData(fileSize / sizeof(int));
        inFile.read(reinterpret_cast<char*>(loadedData.data()), fileSize);
        inFile.close();
    }

    return 0;
}