C++ 组含子项自定义排序通用设计

本文作者原创，首发在本博客；CSDN 上的同名文章已标注为转载并回链到本页：https://blog.csdn.net/qq_30220519/article/details/139184128

#include

class Base;
using BaseSp = std::shared_ptr;
class Base
{
public:
    explicit Base(int id) : ID(id) {}
    int ID;
};

class Sorter
{
public:
    virtual bool sort(const BaseSp &l, const BaseSp &r) { return true; }
};
using SorterSp = std::shared_ptr;

class BaseNameSorter : public Sorter
{
public:
    bool sort(const BaseSp &l, const BaseSp &r) override { return l->ID < r->ID; }
};
using BaseNameSorterSp = std::shared_ptr;

class BaseDateSorter : public Sorter
{
public:
    bool sort(const BaseSp &l, const BaseSp &r) override { return l->ID < r->ID; }
};
using BaseDateSorterSp = std::shared_ptr;

class ShareSorter
{
public:
    SorterSp sorter;
};
using ShareSorterSp = std::shared_ptr;
using ShareSorterWp = std::weak_ptr;

class SortBase
{
public:
    explicit SortBase(BaseSp data, ShareSorterSp sorter) : base(data), m_sortDelegate(sorter) {}
    bool operator<(const SortBase &other) const
    {
        bool isExpired = m_sortDelegate.expired();
        auto delegate  = m_sortDelegate.lock();
        if (isExpired || !delegate || !delegate->sorter) {
            assert(false);
            return true;
        }
        return delegate->sorter->sort(base, other.base);
    }
    BaseSp        base;
    ShareSorterWp m_sortDelegate;
};

class Group
{
public:
    std::set m_set;
    ShareSorterSp      m_sorter;
};

int main()
{
    Group styleGroups;        //数组组

    ShareSorterSp shareSorter = std::make_shared();
    shareSorter->sorter       = std::make_shared();
    styleGroups.m_sorter      = shareSorter;  //初始化组与子共享排序器

    BaseSp base1 = std::make_shared(0);
    BaseSp base2 = std::make_shared(1);
    styleGroups.m_set.emplace(base1, styleGroups.m_sorter); //添加待排序数据
    styleGroups.m_set.emplace(base2, styleGroups.m_sorter); //触发共享排序器

    shareSorter->sorter = std::make_shared();
    BaseSp base3        = std::make_shared(2);    //换排序方式
    styleGroups.m_set.emplace(base3, styleGroups.m_sorter);
    return 0;
}

赏

谢谢你请我吃糖果

支付宝