dl_algorithm.h

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#pragma once
 
#include <algorithm>
#include <cassert>
#include <stack>
#include <array>
#include <vector>
 
#include "base/dl_concept.h"
#include "base/dl_array.h"
 
namespace dl
{

template<typename T>
constexpr T clamp(const T& x, const T& a, const T& b)
{
    if (x < a)
        return a;
    if (b < a)
        return b;
    return x;
}

template<typename T>
constexpr T saturate(const T& x)
{
#if DL_PLATFORM == DL_PLATFORM_LINUX
    return dl::clamp<T>(x, 0, 1);
#else
    return std::clamp<T>(x, 0, 1);
#endif
}

template<typename T>
constexpr T is_saturate(const T& x)
{
    return x >= 0 && x <= 1;
}

template<typename T>
constexpr Array<T, 3> cross(const Array<T, 3>& a, const Array<T, 3>& b)
{
    return {
        a[1] * b[2] - a[2] * b[1],
        a[2] * b[0] - a[0] * b[2],
        a[0] * b[1] - a[1] * b[0] };
}
 
 
    
template<typename T>
[[deprecated]]
inline T cast_dynamic(void* p)
{
    return dynamic_cast<T>(p);
}
 

template<typename T, size_t N>
bool limit_bigger(Array<T, N>& a, const Array<T, N>& limit)
{
    bool ret = false;
    for (int i = 0; i != N; ++i)
    {
        if (a[i] < limit[i])
        {
            a[i] = limit[i];
            ret = true;
        }
    }
    return ret;
}
 
template <typename T>
inline const T& as_const(T& a)
{
#if DL_PLATFORM == DL_PLATFORM_WIN32
    return std::as_const(a);
#else
    return (const T&)a;
#endif
}
 
//-------------------------------------------------------other-----------------------------------------

template<typename T, typename V>
void erase_head_from_last(T& container, const V& a)
{
    auto iter = find(container.rbegin(), container.rend(), a);
 
    if (iter != container.rend())
        container.erase(container.begin(), iter.base());
}
    
    

template<PopFrontAble C, typename F>
void operate_front(C& container, F func)
{
    while (!container.empty())
    {
        auto iter = container.front();
        container.pop_front();
 
        func(iter);
    }
}
 
    
 

//namespace Find
//{
//  /**
//  * @brief find，返回下标
//  * @note 失败返回-1
//  */
//  template<typename T, typename V>
//  size_t Index(const T& container, const V& v)
//  {
//      size_t size = container.size();
//      for (size_t i = 0; i < size; ++i)
//      {
//          if (container[i] == v)
//          {
//              return i;
//          }
//      }
//      return -1;
//  }
//  /**
//  * @brief find，返回下标
//  * @note 失败返回y == size
//  */
//  template<typename T, typename V>
//  array<size_t, 2> Index(const vector<vector<T>>& container, const V& v)
//  {
//      array<size_t, 2> ret{};
//      for (; ret[1] < container.size(); ++ret[1])
//      {
//          auto& line = container[ret[1]];
//          for (ret[0] = 0; ret[0] < line.size(); ++ret[0])
//          {
//              if (line[ret[0]] == v)
//              {
//                  return ret;
//              }
//          }
//      }
//      return ret;
//  }
//}
 
    
 

template<typename T>
inline T* pointer(T&& x)
{
    return &x;
}

template<typename T>
inline const T& constant(T& v)
{
    return v;
}
 
 

//template<typename T, typename V>
//inline void replace(T& vec, V v, V v_new)
//{
//  for (auto& iter : vec)
//  {
//      if (iter == v)
//          iter = v_new;
//  }
//}

template<typename C>
auto find_equal(C& container)
{
    for (auto iter = container.begin(); iter != container.end(); ++iter)
    {
        auto iter1 = iter;
        ++iter1;
        for (; iter1 < container.end(); ++iter1)
        {
            if (*iter == *iter1)
                return iter1;
        }
    }
    return container.end();
}
 

template<typename T, typename V>
T insert_per_num(const T& container, V v, size_t per_num)
{
    if (container.size() <= per_num)
        return T(container);
 
    size_t num = (container.size() - 1) / per_num;//每3个插入计算得出：9 -> 2; 11 -> 3
    T ret;
    ret.resize(num + container.size());
 
    size_t i = 0;
    auto iter = container.begin();
    auto iter_ret = ret.begin();
    while (iter != container.end())
    {
        *iter_ret++ = *iter++;
        ++i;
        //满per_num额外加入一个v，且不为最后一个
        if (i % per_num == 0
            && i < container.size())
            *iter_ret++ = v;
    }
 
    return ret;
}
 

template<typename T, typename V>
T r_insert_per_num(const T& container, V v, size_t per_num)
{
    if (container.size() <= per_num)
        return T(container);
 
    size_t num = (container.size() - 1) / per_num;//每3个插入计算得出：9 -> 2; 11 -> 3
    T ret;
    ret.resize(num + container.size());
 
    size_t i = 0;
    auto iter = container.rbegin();
    auto iter_ret = ret.rbegin();
    while (iter != container.rend())
    {
        *iter_ret++ = *iter++;
        ++i;
        //满per_num额外加入一个v，且不为最后一个
        if (i % per_num == 0
            && i < container.size())
            *iter_ret++ = v;
    }
 
    return ret;
}

template<typename T, typename V>
void split(const T& container, V delimiter, std::vector<T>& ret)
{
    if (container.empty())
        return;
 
    //主迭代器位置
    auto iter_begin = container.begin();
 
    while (true)
    {
        //当前位置就是分隔符，则添加 空元素
        if (*iter_begin == delimiter)
        {
            ret.push_back(T());
            if (++iter_begin == container.end())
            {
                ret.push_back(T());//还要额外添加一个
                return;
            }
        }
        else
        {
            //分隔符位置
            auto iter_find = std::find(iter_begin, container.end(), delimiter);
 
            if (iter_find == container.end())
            {//分隔符 未找到（说明字符串读完了，最后没有分隔符的情况）
                ret.push_back(T(iter_begin, container.end()));
                return;
            }
            else
            {
                ret.push_back(T(iter_begin, iter_find));
                iter_begin = iter_find + 1;
                if (iter_begin == container.end())
                {
                    ret.push_back(T(iter_begin, container.end()));
                    return;
                }
            }
        }
    }
}

template<typename T, typename V>
void split_no_empty(const T& container, V delimiter, std::vector<T>& ret)
{
    if (container.empty())
        return;
 
    //主迭代器位置
    auto iter_begin = container.begin();
 
    while (true)
    {
        //当前位置就是分隔符，不添加 空元素，只往后移动
        if (*iter_begin == delimiter)
        {
            if (++iter_begin == container.end())
                return;
        }
        else
        {
            //分隔符位置
            auto iter_find = std::find(iter_begin, container.end(), delimiter);
 
            if (iter_find == container.end())
            {//分隔符 未找到（说明字符串读完了，最后没有分隔符的情况）
                ret.push_back(T(iter_begin, container.end()));
                return;
            }
            else
            {
                ret.push_back(T(iter_begin, iter_find));
                iter_begin = iter_find + 1;
                if (iter_begin == container.end())
                    return;
            }
        }
    }
}

template<typename T>
void split_sub(const T& container, const T& delimiter, std::vector<T>& ret)
{   
    if (container.empty())
        return;
    assert(!delimiter.empty());
 
    auto iter_pre = container.begin();
    auto iter_d = delimiter.begin();
 
    bool mode_d = false;//是否匹配分隔符中
    auto iter_cur = iter_pre;
 
    auto iter_cat = iter_pre;//开始匹配分隔符的位置
 
    while (true)
    {
        if (!mode_d)
        {//正常模式
            if (iter_cur == container.end())
            {
                ret.push_back(T(iter_pre, iter_cur));
                return;
            }
            if (*iter_cur == *iter_d)
            { // 匹配到分隔符首个，进入匹配模式
                mode_d = true;
                iter_cat = iter_cur;
                ++iter_cur;
                ++iter_d;
                continue;
            }
            else
            {
                ++iter_cur;
            }
        }
        else
        {//匹配模式
            if (iter_d == delimiter.end())
            {//完全匹配分隔符
                ret.push_back(T(iter_pre, iter_cat));
                mode_d = false;
                iter_d = delimiter.begin();
                iter_pre = iter_cur;
                continue;
            }
 
            if (iter_cur == container.end())
            {//字符结束，未完全匹配
                ret.push_back(T(iter_pre, iter_cur));
                return;
            }
 
            if (*iter_cur == *iter_d)
            {//当前匹配
                ++iter_cur;
                ++iter_d;
                continue;
            }
            else
            {//不匹配，进入普通模式
                mode_d = false;
                iter_d = delimiter.begin();
                continue;
            }
        }
    }
}

template<typename T, typename V>
void make_sequence(T& c, const std::initializer_list<std::initializer_list<V>>& vec)
{
    for (auto& iter : vec)
    {
        assert(iter.size() == 2);
        V f = *iter.begin();
        const V& b = *(iter.begin() + 1);
        assert(f < b);
        while (f < b)
        {
            c.push_back(f++);
        }
    }
}

template<typename C, typename F>
void for_couple(const C& container, F func, bool ring = false)
{
    if (container.empty())
    {
        return;
    }
 
    auto iter_pre = std::begin(container);
    auto iter_cur = std::next(iter_pre);
 
    for (; iter_cur != std::end(container);)
    {
        func(*iter_pre, *iter_cur);
        ++iter_pre;
        ++iter_cur;
    }
    if (ring)
        func(*iter_pre, *std::begin(container));
}

template<typename C, typename F>
void for_couple_r(const C& container, F func, bool ring = false)
{
    if (container.empty())
    {
        return;
    }
 
    auto iter_pre = std::rbegin(container);
    auto iter_cur = std::next(iter_pre);
 
    for (; iter_cur != std::rend(container);)
    {
        func(*iter_pre, *iter_cur);
        ++iter_pre;
        ++iter_cur;
    }
    if (ring)
        func(*iter_pre, *std::rbegin(container));
}

template<IsPointer T, typename FC, typename F>
void for_tree(T root, FC func_child, F func)
{
    std::stack<T> s;
    s.push(root);
 
    while (!s.empty())
    {
        T node_this = s.top();
        s.pop();
        func(node_this);
 
        //反向添加，这样左子树先遍历
        using C = decltype(func_child(node_this));
        C c = func_child(node_this);
        for (auto iter = c->rbegin(); iter != c->rend(); ++iter)
        {
            T& node = *iter;
            s.push(node);
        }
    }
}

template<typename F>
class finally
{
public:
    finally(F&& func) : _func(func) {}
    ~finally() { _func(); }
private:
    F _func;
};

/*template<typename T, size_t N>
[[deprecated]]
constexpr size_t arr_size(const T(&)[N])
{
    return N;
}*/
 

template<typename T, size_t N>
constexpr T& arr_last(const T(&arr)[N])
{
    return arr[N - 1];
}

template<IsSigned T>
constexpr T sign(const T& v)
{
    if (v > 0)
        return 1;
    else if (v < 0)
        return -1;
    else
        return 0;
}
 
    
template<size_t N>
consteval uint64_t str_uid(const char(&str)[N])
{
    //64 / 6 = 10 再加1结束符
    static_assert(N > 0 && N <= 11, "字符串长度过长！");
    uint64_t ret = 0;
    for (size_t i = 0; i < N - 1; ++i)
    {
        char ch = str[i];
 
        if (ch >= 48 && ch <= 57)
            ch += 6;//0-9
        else if (ch >= 65 && ch <= 90)
            ch -= 65;//A-Z
        else if (ch >= 97 && ch <= 122)
            ch -= 71;//a-z
        else if (ch == 95)
            ch = 62;
        else if (ch == 46)
            ch = 63;
        else
            assert(0 && "只能是字母、数字、下划线、点！");
 
        ret |= ((uint64_t)ch << (i * 6));
    }
    return ret;
}
}