D2Learn Forums

dustchens

@SPeak 感谢大佬，已经解决了。不过我还是很疑惑，vector练习里也有自赋值的检测，为什么可以正常进入练习，也只是提示double free，为什么循环链表这里会出现死循环

dustchens

@SPeak 大概定位到了问题，在我当前的代码下，slist.2.cpp里的 // d2ds::SLinkedList<int> intList2(intList1); 这些拷贝语句都会使得无法进入该练习
https://github.com/dustchens/my-d2ds/tree/main/dslings/exercises/linked-list
这是我出错的仓库链接

dustchens

@SPeak 乱码确实没有了。
是运行下一个检查没有成功，是否需要改slist.2.cpp里的内容？还是我把 .gitignore删掉上传全部内容？没有用过xmake，是不是我自己的代码出现了问题导致的这后面的运行不起来。。我在修改slist.2.cpp里的内容，看看注释掉一部分后哪里有问题，定位到导致出错的语句，然后贴上自己SLinkedList.hpp里的代码，这样可以吗？

dustchens

@SPeak

删除main之前在 .xlings里执行命令的完整输出

xmake xlings -D --project=. J:\cpp_project\d2ds d2x checker

✅ Successfully ran dslings\tests\dslings.0.cpp

🎉   The code is compiling!   🎉

---------C-Output---------
🌏Progress: [===>----------------------------------------------] 3/49

[Target: 0-dslings-B-1] - normal

✅ Successfully ran dslings\tests\dslings.1.cpp

🎉   The code is compiling!   🎉

---------C-Output---------
[D2DS LOGI]: - ✅ | mVal.get() == 2 (2 == 2)
🌏Progress: [====>---------------------------------------------] 4/49

[Target: 0-dslings-B-2] - normal

✅ Successfully ran dslings\tests\dslings.2.cpp      

🎉   The code is compiling!   🎉

---------C-Output---------
[D2DS LOGI]: - ✅ | mVal.get() == 2 (2 == 2)
[D2DS LOGI]: - ✅ | mVal.get() == 2 (2 == 2)
🌏Progress: [=====>--------------------------------------------] 5/49

[Target: 1-array-A-0] - normal

✅ Successfully ran dslings\useage\array\array.u0.cpp

🎉   The code is compiling!   🎉

🌏Progress: [======>-------------------------------------------] 6/49

[Target: 1-array-B-0] - normal

✅ Successfully ran dslings\tests\array\array.0.cpp

🎉   The code is compiling!   🎉
🌏Progress: [=======>------------------------------------------] 7/49

[Target: 1-array-B-1] - normal

✅ Successfully ran dslings\tests\array\array.1.cpp

🎉   The code is compiling!   🎉
🌏Progress: [========>-----------------------------------------] 8/49

[Target: 1-array-B-2] - normal

✅ Successfully ran dslings\tests\array\array.2.cpp

🎉   The code is compiling!   🎉

---------C-Output---------
[D2DS LOGI]: - ✅ | BigFiveTest::destructor()
[D2DS LOGI]: - ✅ | BigFiveTest::copy_assignment()
[D2DS LOGI]: - ✅ | BigFiveTest::move_assignment()
🌏Progress: [=========>----------------------------------------] 9/49

[Target: 1-array-B-3] - normal

✅ Successfully ran dslings\tests\array\array.3.cpp

🎉   The code is compiling!   🎉

---------C-Output---------
[D2DS LOGI]: - ✅ | intArr[0] == 5 (5 == 5)
🌏Progress: [==========>---------------------------------------] 10/49

[Target: 1-array-B-4] - normal

✅ Successfully ran dslings\tests\array\array.4.cpp

🎉   The code is compiling!   🎉

---------C-Output---------
[D2DS LOGI]: - ✅ | i == intArr[i] (0 == 0)
[D2DS LOGI]: - ✅ | i == intArr[i] (1 == 1)
[D2DS LOGI]: - ✅ | i == intArr[i] (2 == 2)
[D2DS LOGI]: - ✅ | i == intArr[i] (3 == 3)
🌏Progress: [===========>--------------------------------------] 11/49

[Target: 1-array-B-5] - normal

✅ Successfully ran dslings\tests\array\array.5.cpp

🎉   The code is compiling!   🎉

---------C-Output---------
[D2DS LOGI]: - ✅ | intArr.begin() != intArr.end() 
[D2DS LOGI]: - ✅ | data == val (0 == 0)
[D2DS LOGI]: - ✅ | data == val (1 == 1)
[D2DS LOGI]: - ✅ | data == val (2 == 2)
🌏Progress: [============>-------------------------------------] 12/49

[Target: 1-array-B-6] - normal

✅ Successfully ran dslings\tests\array\array.6.cpp

🎉   The code is compiling!   🎉

---------C-Output---------
[D2DS LOGI]: - ✅ | intArr[0] == intArr[-4] (100 == 100)
[D2DS LOGI]: - ✅ | intArr[1] == intArr[-3] (50 == 50)
🌏Progress: [=============>------------------------------------] 13/49

[Target: 2-vector-B-0-0] - normal

✅ Successfully ran dslings\tests\vector\vector.0.0.cpp

🎉   The code is compiling!   🎉

🌏Progress: [==============>-----------------------------------] 14/49

[Target: 2-vector-B-0-1] - normal

✅ Successfully ran dslings\tests\vector\vector.0.1.cpp

🎉   The code is compiling!   🎉

---------C-Output---------
[D2DS LOGI]: allocate: dslings\tests\vector\vector.0.1.cpp:24 - StackMemAllocator: try to allocate 4 bytes
🌏Progress: [===============>----------------------------------] 15/49

[Target: 2-vector-B-0-all] - normal

✅ Successfully ran dslings\tests\vector\vector.0.cpp

🎉   The code is compiling!   🎉

---------C-Output---------
[D2DS LOGI]: allocate: dslings\tests\vector\vector.0.cpp:19 - StackMemAllocator: try to allocate 10 bytes
[D2DS LOGI]: allocate: dslings/common/common.hpp:64 - DefaultAllocator: try to allocate 24 bytes
[D2DS LOGI]: - ✅ | d2ds::DefaultAllocator::allocate_counter() == 1 (1 == 1)
🌏Progress: [================>---------------------------------] 16/49

[Target: 2-vector-B-1-0] - normal

✅ Successfully ran dslings\tests\vector\vector.1.0.cpp

🎉   The code is compiling!   🎉

---------C-Output---------
[D2DS LOGI]: allocate: dslings/common/common.hpp:64 - DefaultAllocator: try to allocate 4 bytes
[D2DS LOGI]: deallocate: dslings/common/common.hpp:73 - DefaultAllocator: free addr 000001a86f578f80, bytes 4
🌏Progress: [=================>--------------------------------] 17/49

[Target: 2-vector-B-1-1] - normal

✅ Successfully ran dslings\tests\vector\vector.1.1.cpp

🎉   The code is compiling!   🎉

---------C-Output---------
[D2DS LOGI]: allocate: dslings/common/common.hpp:64 - DefaultAllocator: try to allocate 20 bytes
[D2DS LOGI]: allocate: dslings/common/common.hpp:64 - DefaultAllocator: try to allocate 20 bytes
[D2DS LOGI]: allocate: dslings/common/common.hpp:64 - DefaultAllocator: try to allocate 20 bytes
[D2DS LOGI]: - ✅ | BigFiveTest::copy_constructor()
[D2DS LOGI]: deallocate: dslings/common/common.hpp:73 - DefaultAllocator: free addr 000001cc22a81790, bytes 20
[D2DS LOGI]: allocate: dslings/common/common.hpp:64 - DefaultAllocator: try to allocate 20 bytes
[D2DS LOGI]: deallocate: dslings/common/common.hpp:73 - DefaultAllocator: free addr 000001cc22a817f0, bytes 20
[D2DS LOGI]: deallocate: dslings/common/common.hpp:73 - DefaultAllocator: free addr 000001cc22a819b0, bytes 20
[D2DS LOGI]: deallocate: dslings/common/common.hpp:73 - DefaultAllocator: free addr 000001cc22a81770, bytes 20
🌏Progress: [==================>-------------------------------] 18/49

[Target: 2-vector-B-1-2] - normal

✅ Successfully ran dslings\tests\vector\vector.1.2.cpp

🎉   The code is compiling!   🎉

---------C-Output---------
[D2DS LOGI]: allocate: dslings/common/common.hpp:64 - DefaultAllocator: try to allocate 20 bytes
[D2DS LOGI]: allocate: dslings/common/common.hpp:64 - DefaultAllocator: try to allocate 40 bytes
[D2DS LOGI]: deallocate: dslings/common/common.hpp:73 - DefaultAllocator: free addr 000001a914b20e50, bytes 20
[D2DS LOGI]: - ✅ | d2ds::DefaultAllocator::allocate_counter() == 2 (2 == 2)
[D2DS LOGI]: deallocate: dslings/common/common.hpp:73 - DefaultAllocator: free addr 000001a914b21070, bytes 40
[D2DS LOGI]: - ✅ | d2ds::DefaultAllocator::deallocate_counter() == 2 (2 == 2)
[D2DS LOGI]: - ✅ | BigFiveTest::self_assignment()
🌏Progress: [===================>------------------------------] 19/49

[Target: 2-vector-B-1-all] - normal

✅ Successfully ran dslings\tests\vector\vector.1.cpp

🎉   The code is compiling!   🎉

---------C-Output---------
[D2DS LOGI]: allocate: dslings/common/common.hpp:64 - DefaultAllocator: try to allocate 4 bytes
[D2DS LOGI]: deallocate: dslings/common/common.hpp:73 - DefaultAllocator: free addr 00000179b2ff8fa0, bytes 4
[D2DS LOGI]: - ✅ | BigFiveTest::destructor()
[D2DS LOGI]: allocate: dslings/common/common.hpp:64 - DefaultAllocator: try to allocate 20 bytes
[D2DS LOGI]: allocate: dslings/common/common.hpp:64 - DefaultAllocator: try to allocate 20 bytes
[D2DS LOGI]: allocate: dslings/common/common.hpp:64 - DefaultAllocator: try to allocate 20 bytes
[D2DS LOGI]: - ✅ | BigFiveTest::copy_constructor()
[D2DS LOGI]: deallocate: dslings/common/common.hpp:73 - DefaultAllocator: free addr 00000179b2fe1040, bytes 20
[D2DS LOGI]: allocate: dslings/common/common.hpp:64 - DefaultAllocator: try to allocate 20 bytes
[D2DS LOGI]: deallocate: dslings/common/common.hpp:73 - DefaultAllocator: free addr 00000179b2fe11c0, bytes 20
[D2DS LOGI]: deallocate: dslings/common/common.hpp:73 - DefaultAllocator: free addr 00000179b2fe13c0, bytes 20
[D2DS LOGI]: deallocate: dslings/common/common.hpp:73 - DefaultAllocator: free addr 00000179b2fe13a0, bytes 20
[D2DS LOGI]: allocate: dslings/common/common.hpp:64 - DefaultAllocator: try to allocate 20 bytes
[D2DS LOGI]: allocate: dslings/common/common.hpp:64 - DefaultAllocator: try to allocate 40 bytes
[D2DS LOGI]: deallocate: dslings/common/common.hpp:73 - DefaultAllocator: free addr 00000179b2fe1060, bytes 20
[D2DS LOGI]: - ✅ | d2ds::DefaultAllocator::allocate_counter() == 2 (2 == 2)
[D2DS LOGI]: deallocate: dslings/common/common.hpp:73 - DefaultAllocator: free addr 00000179b2fe0f30, bytes 40
[D2DS LOGI]: - ✅ | 2 == d2ds::DefaultAllocator::deallocate_counter() (2 == 2)
[D2DS LOGI]: - ✅ | BigFiveTest::self_assignment()
🌏Progress: [====================>-----------------------------] 20/49

[Target: 2-vector-B-2] - normal

✅ Successfully ran dslings\tests\vector\vector.2.cpp

🎉   The code is compiling!   🎉

---------C-Output---------
[D2DS LOGI]: - ✅ | intArr1.empty()
[D2DS LOGI]: - ✅ | intArr2.size() == 10 (10 == 10)
🌏Progress: [=====================>----------------------------] 21/49

[Target: 2-vector-B-3-0] - normal

✅ Successfully ran dslings\tests\vector\vector.3.0.cpp

🎉   The code is compiling!   🎉

---------C-Output---------
[D2DS LOGI]: - ✅ | intArr1.capacity() == intArr2.capacity() (0 == 0)
[D2DS LOGI]: - ✅ | intArr1.size() == intArr2.capacity() (0 == 0)
[D2DS LOGI]: - ✅ | intArr.capacity() == 10 (10 == 10)
[D2DS LOGI]: - ✅ | intArr.capacity() == 4 (4 == 4)
[D2DS LOGI]: - ✅ | intArr1.capacity() == intArr2.capacity() (4 == 4)
[D2DS LOGI]: - ✅ | intArr3.capacity() == intArr2.capacity() (4 == 4)
[D2DS LOGI]: - ✅ | intArr1.capacity() == 0 (0 == 0)
[D2DS LOGI]: - ✅ | intArr2.capacity() == 10 (10 == 10)
🌏Progress: [======================>---------------------------] 22/49

[Target: 2-vector-B-3-all] - normal

✅ Successfully ran dslings\tests\vector\vector.3.cpp

🎉   The code is compiling!   🎉

---------C-Output---------
[D2DS LOGI]: - ✅ | intArr[0] == 1 (1 == 1)
[D2DS LOGI]: - ✅ | intArr.capacity() == 2 (2 == 2)
[D2DS LOGI]: - ✅ | intArr[1] == 2 (2 == 2)
[D2DS LOGI]: - ✅ | intArr[2] == 3 (3 == 3)
[D2DS LOGI]: - ✅ | intArr.size() == 3 (3 == 3)
[D2DS LOGI]: - ✅ | intArr.capacity() == 4 (4 == 4)
[D2DS LOGI]: - ✅ | intArr[1] == 2 (2 == 2)
[D2DS LOGI]: - ✅ | intArr[0] == 1 (1 == 1)
[D2DS LOGI]: - ✅ | intArr.capacity() == 8 (8 == 8)
[D2DS LOGI]: - ✅ | intArr[intArr.size() - 1] == 2 (2 == 2)
🌏Progress: [=======================>--------------------------] 23/49

[Target: 2-vector-B-4] - normal

✅ Successfully ran dslings\tests\vector\vector.4.cpp

🎉   The code is compiling!   🎉

🌏Progress: [========================>-------------------------] 24/49

[Target: 2-vector-B-5] - normal

✅ Successfully ran dslings\tests\vector\vector.5.cpp

🎉   The code is compiling!   🎉

---------C-Output---------
🌏Progress: [=========================>------------------------] 25/49

[Target: 3-embedded-slist-B-0] - normal

✅ Successfully ran dslings\tests\embedded-list\embedded-slist.0.cpp

🎉   The code is compiling!   🎉

🌏Progress: [==========================>-----------------------] 26/49

[Target: 3-embedded-slist-B-1] - normal

✅ Successfully ran dslings\tests\embedded-list\embedded-slist.1.cpp   

🎉   The code is compiling!   🎉

🌏Progress: [===========================>----------------------] 27/49

[Target: 3-embedded-slist-B-2] - normal

✅ Successfully ran dslings\tests\embedded-list\embedded-slist.2.cpp

🎉   The code is compiling!   🎉

🌏Progress: [============================>---------------------] 28/49

[Target: 3-embedded-slist-B-3] - normal

✅ Successfully ran dslings\tests\embedded-list\embedded-slist.3.cpp   

🎉   The code is compiling!   🎉

🌏Progress: [=============================>--------------------] 29/49

[Target: 3-embedded-slist-B-4] - normal

✅ Successfully ran dslings\tests\embedded-list\embedded-slist.4.cpp

🎉   The code is compiling!   🎉

🌏Progress: [==============================>-------------------] 30/49

[Target: 4-slinked-list-B-0] - normal

✅ Successfully ran dslings\tests\slinked-list\slist.0.cpp

🎉   The code is compiling!   🎉

🌏Progress: [===============================>------------------] 31/49

[Target: 4-slinked-list-B-1] - normal

✅ Successfully ran dslings\tests\slinked-list\slist.1.cpp

🎉   The code is compiling!   🎉

---------C-Output---------
[D2DS LOGI]: allocate: dslings/common/common.hpp:64 - DefaultAllocator: try to allocate 16 bytes
[D2DS LOGI]: allocate: dslings/common/common.hpp:64 - DefaultAllocator: try to allocate 16 bytes
[D2DS LOGI]: allocate: dslings/common/common.hpp:64 - DefaultAllocator: try to allocate 16 bytes
[D2DS LOGI]: - ✅ | d2ds::DefaultAllocator::allocate_counter() == 3 (3 == 3)
[D2DS LOGI]: deallocate: dslings/common/common.hpp:73 - DefaultAllocator: free addr 000001d6a91d1270, bytes 16
[D2DS LOGI]: deallocate: dslings/common/common.hpp:73 - DefaultAllocator: free addr 000001d6a91d11b0, bytes 16
[D2DS LOGI]: deallocate: dslings/common/common.hpp:73 - DefaultAllocator: free addr 000001d6a91d14f0, bytes 16
[D2DS LOGI]: - ✅ | d2ds::DefaultAllocator::allocate_counter() == d2ds::DefaultAllocator::deallocate_counter() (3 == 3)


AI-Tips-Config: https://d2learn.org/docs/xlings

---------E-Files---------
dslings\tests\slinked-list\slist.1.cpp
-------------------------

Homepage: https://github.com/d2learn/xlings
error: wait events in poller failed!

删除main里的内容之后再次执行的输出

xmake xlings -D --project=. J:\cpp_project\d2ds d2x checker

✅ Successfully ran dslings\tests\dslings.0.cpp

🎉   The code is compiling!   🎉

---------C-Output---------
🌏Progress: [===>----------------------------------------------] 3/49

[Target: 0-dslings-B-1] - normal

✅ Successfully ran dslings\tests\dslings.1.cpp

🎉   The code is compiling!   🎉

---------C-Output---------


🌏Progress: [==============================>-------------------] 30/49

[Target: 4-slinked-list-B-1] - normal

✅ Successfully ran dslings\tests\slinked-list\slist.1.cpp

🎉   The code is compiling!   🎉

🌏Progress: [===============================>------------------] 31/49

[Target: 4-slinked-list-B-1] - normal

✅ Successfully ran dslings\tests\slinked-list\slist.1.cpp

🎉   The code is compiling!   🎉

---------C-Output---------


AI-Tips-Config: https://d2learn.org/docs/xlings

---------E-Files---------
dslings\tests\slinked-list\slist.1.cpp
-------------------------

Homepage: https://github.com/d2learn/xlings
error: wait events in poller failed!

删掉config.xlings里 checker 的 vscode，在终端中运行的输出依旧一致


🌏Progress: [===============================>------------------] 31/49

[Target: 4-slinked-list-B-1] - normal

✅ Successfully ran dslings\tests\slinked-list\slist.1.cpp

🎉   The code is compiling!   🎉

---------C-Output---------


AI-Tips-Config: https://d2learn.org/docs/xlings

---------E-Files---------
dslings\tests\slinked-list\slist.1.cpp
-------------------------

Homepage: https://github.com/d2learn/xlings
error: wait events in poller failed!

观察了一下xmake build，结束slist.1.cpp 要运行下一个的时候，cpu占用率迅速提升了，本来只有5-6这样，然后提升到了18，然后等待一段时间，大概十几秒二十秒，结束的时候内存占用从60mb突然提升到200多然后结束

dustchens

@SPeak 貌似还是在这个地方失败了

重新下载了文件后依旧只能执行到slist.1.cpp这一个，后续的无法检测，在我这边貌似是固定复现

dustchens

退出前xmake build在高速运行

dustchens

xlings版本为0.0.4

dustchens

8d4188dd-70e0-4be6-ab0b-09b96d5833fc-a6ced52b-48ba-447c-9c74-40edf94c6e16.png

slist.1.cpp练习完成后进入下一个检测，xmake会报错，然后退出检测，后续继续自动检测也同样报错
报错信息如下
Homepage: https://github.com/d2learn/xlings
error: wait events in poller failed!
error: execv(xmake xlings --project=. J:\cpp_project\d2ds d2x checker) failed(-1)

dustchens

@SPeak
按照这个思路，只保留一个列表初始化，用了一个辅助函数检测了每个元素是否是数组，如果是数组就检测长度是否是2，然后首元素是否是string，如果初始化列表里全部元素都符合就判定为object。这个代码运行成功了，感谢大佬

  Json(std::initializer_list<Json> init) {
    if (is_object_list(init)) {
      JsonObject dict;
      for (const auto &el : init) {
        auto pair = std::get_if<JsonArray>(&el.m_value);
        // 必须是长度为2的数组
        assert(pair && pair->size() == 2);
        auto key = std::get_if<std::string>(&(*pair)[0].m_value);
        // 第一个元素必须是字符串
        assert(key);
        dict.emplace(*key, (*pair)[1]);
      }
      m_value = std::move(dict);
    } else {
      m_value = JsonArray(init);
    }
  }

  bool is_object_list(std::initializer_list<Json> init) {
    return std::all_of(init.begin(), init.end(), [](const Json &el) {
      auto pair = std::get_if<JsonArray>(&el.m_value);
      if (!pair || pair->size() != 2)
        return false;
      return std::holds_alternative<std::string>((*pair)[0].m_value);
    });
  }

dustchens

可能给每个类型都加一个构造函数也是有问题的设计，也许需要一个模板替代

dustchens

用c++17 variant实现的json库，想实现用 {} 大括号快速构建一个嵌套的json对象，但是加入了initializerlist后出现了灾难性的构造问题，无法构造数组、对象类型，更无法构建复杂的嵌套类型。如果去掉其中一个列表初始化，只保留构建数组的初始化列表，也不能实现匹配的问题，除非在构造时手动标明类型，但这和列表初始化的初衷完全背离了

main

#include "include/json/json.h"
#include <iostream>

using myjson::Json;
using std::cin, std::cout, std::endl;
int main(int, char **) {
  // 数组也无法用initializer_list构造，除非将部分单参数构造变为隐式，但这本质就是错误的，可能导致一系列问题
  Json json_1 { 3.141, 2, 17};
  // Json json2
  // {
  //     {"pi", 3.141},
  //     {"happy", true},
  //     {"name", "Niels"},
  //     {"nothing", nullptr},
  //     {
  //         "answer", {
  //             {"everything", 42}
  //         }
  //     },
  //     {"list", {1, 0, 2}}
  // };
  cout<<json_1.is_array()<<endl;
  cout<<json_2.is_object()<<endl;
  return 0;
}

json.h

#pragma once

#include <cstddef>
#include <initializer_list>
#include <stdexcept>
#include <string>
#include <unordered_map>
#include <utility>
#include <variant>
#include <vector>

namespace myjson {
class Json;

template <typename... Ts> struct overload : Ts... {
  using Ts::operator()...;
};
template <typename... Ts> overload(Ts...) -> overload<Ts...>;

using JsonArray = std::vector<Json>;
using JsonObject = std::unordered_map<std::string, Json>;

class Json {
public:
  using ValueType = std::variant<std::nullptr_t, bool, int, double, std::string,
                                 JsonArray, JsonObject>;
public:
  Json() : m_value(nullptr) {}
  Json(const Json &) = default;
  Json(Json &&) = default;
  ~Json() = default;
  // 从基本类型构造
  Json(std::nullptr_t) : m_value(nullptr) {}
  explicit Json(bool value) : m_value(value) {}
  // 防止 bool 构造为 int
  template<typename Int, typename = std::enable_if_t<std::is_integral_v<Int>
  && !std::is_same_v<Int, bool>>> 
  explicit Json(int value) noexcept : m_value(static_cast<int>(value)) {} 
  explicit Json(double value) : m_value(value) {}
  explicit Json(const std::string& value) : m_value(value) {}

  //const char* 是否需要构造存疑
  // explicit Json(const char* value) : m_value(std::string(value)) {}
  explicit Json(JsonArray value) : m_value(std::move(value)) {}
  explicit Json(JsonObject value) : m_value(std::move(value)) {}

  
    Json(std::initializer_list<Json> init){
      JsonArray array;
      for (const auto& element : init) {
          array.emplace_back(element);
      }
      m_value = std::move(array);
  }
  // object initializer_list构造
  // Json(std::initializer_list<std::pair<const std::string, Json>> init) {
  //     JsonObject dict;
  //     for (const auto& p : init) {
  //         dict.insert(p);
  //     }
  //     m_value = std::move(dict);
  // }

  Json &operator=(const Json &other) = default;
  Json &operator=(Json &&other) = default;

public:
  [[nodiscard]] constexpr bool is_boolean() const noexcept {
    return std::holds_alternative<bool>(m_value);
  }
  [[nodiscard]] constexpr bool is_integer() const noexcept {
    return std::holds_alternative<int>(m_value);
  }
  [[nodiscard]] constexpr bool is_null() const noexcept {
    return std::holds_alternative<nullptr_t>(m_value);
  }
  [[nodiscard]] constexpr bool is_double() const noexcept {
    return std::holds_alternative<double>(m_value);
  }
  [[nodiscard]] constexpr bool is_string() const noexcept {
    return std::holds_alternative<std::string>(m_value);
  }
  [[nodiscard]] constexpr bool is_array() const noexcept {
    return std::holds_alternative<JsonArray>(m_value);
  }
  [[nodiscard]] constexpr bool is_object() const noexcept {
    return std::holds_alternative<JsonObject>(m_value);
  }

  template <typename T> const T &get() const {
    if (!std::holds_alternative<T>(m_value))
      throw std::runtime_error("type mismatch");
    return std::get<T>(m_value);
  }

  template <typename T> T &get() {
    if (!std::holds_alternative<T>(m_value))
      throw std::runtime_error("type mismatch");
    return std::get<T>(m_value);
  }
JsonArray as_array() {
  if (!is_array())
    throw std::runtime_error("Not an array");
  return get<JsonArray>();
}

JsonObject as_dict() {
  if (!is_object())
    throw std::runtime_error("Not an dict");
  return get<JsonObject>();
}

private:
  ValueType m_value;
};

} // namespace myjson

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