nlohmann_json_reflect

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nlohmann_json_reflect

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a reflect extension for https://github.com/nlohmann/json

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# nlohmann_json_reflect
A reflect extension for https://github.com/nlohmann/json, written by c++17
Support any complex data structure which is defined by user.

## Introduce
It is an extension for nlohmann/json. 
 
 Why write this? Because nlohmann/json reflect is not very powerful. It can not support complex nested data structure. 
 For example: you can not use nlohmann/json reflect macro on the reflect structure nested by std container. Or you must implement the interface defined by nlohmann/json.
 
 Anyway, it is not convenient for reflecting json to data structure directly, also data structure to json.
 Use this extension, you can nest very complex data structure. Std container nest Std container, then nest reflect struct , then nest std container, and so on, layer after layer.

## Note
Structure fields do not need to be forced a one-to-one correspondence with JSON field.
 If you are not sure the field existed or not, std::optional is provided when reflecting.
 When reflect json to structure and field is not existed in json, std::optional in structure will be empty
 When reflect structure to json and std::optional in structure is empty, the field in json will be null

## Usage
intrusive reflect 
```c++
#include "json_reflect.hpp"

auto json1 = R"({
    "MixedArray": [
       "one", 
        50, 
        false, 
        12.005
    ], 
    "People": [
        null,
        {
            "name": "qwer", 
            "age": 1000, 
            "sex": true,
            "flow": 3.000
        }, 
        {
            "name": "qq849635649", 
            "age": 10, 
            "sex": null
        }, 
        {
            "name": null, 
            "age": 20, 
            "sex": true,
            "zzzz": "11"
        }
    ]
})";

struct e1 {
 std::optional<std::string> name;
 int age;
 bool sex;
 float flow;
 REFLECT_INTRUSIVE(e1, name, age, sex, flow);
};

struct e2 {
 std::string name;
 int age;
 std::optional<bool> sex;
 REFLECT_INTRUSIVE(e2, name, age, sex);
};

struct e3 {
 std::optional<std::string> name;
 int age;
 bool sex;
 std::string zzzz;
 REFLECT_INTRUSIVE(e3, name, age, sex, zzzz);
};

struct sjson1 {
 std::tuple<std::string, int, bool, float> MixedArray;
 std::tuple<std::optional<e2>, std::optional<e1>, e2, e3> People;
 REFLECT_INTRUSIVE(sjson1, MixedArray, People);
};

int main() {
 auto json1_data = jreflect::from_json<sjson1>(json1);
 auto json1_str = jreflect::to_json(json1_data);
 return 0;
}
```
 no intrusive reflect
```c++
auto json_str = R"(
{
 "pi": 3.141,
 "happy": true,
 "name": "Niels",
 
 "answer": {
 "everything": 42
 },
 "list": [7, 8, 9, 9 ],
 "object": {
 "currency": "USD",
 "value": 42.99
 },
 "map":{
 "key1": [{"currency": "USD","value" : 40.99},
 {"currency": "USD","value" : 41.99,"yes" : true},
 {"currency": "USD","value" : 42.99}],
 "key2": [{"currency": "USD","value" : 43.99},
 {"currency": "USD","value" : 44.99,"yes" : true},
 {"currency": "USD","value" : 45.99}]
 },
 "taowa":{
	"keyzz": {
		"wa":{
			"zz":"zz"
		}
	}
 }
})";

struct obj {
 std::optional<std::string> currency;
 float value;
};
REFLECT_NON_INTRUSIVE(obj, currency, value);

struct zzz {
    std::string zz;
};
REFLECT_NON_INTRUSIVE(zzz, zz);

struct obj1 {
    std::string currency;
    float value;
    bool yes;
};
REFLECT_NON_INTRUSIVE(obj1, currency, value, yes);

struct keymap {
 std::tuple<obj, obj1, obj> key1;
 std::tuple<obj, obj1, obj> key2;
};
REFLECT_NON_INTRUSIVE(keymap, key1, key2);

struct json_struct {
 std::optional<std::string> nothing;
 std::string name;
 bool happy;
 float pi;
 std::unordered_map <std::string, int> answer;
 std::vector<int> list;
 obj object;
 keymap map;
 std::unordered_map<std::string, std::map<std::string, zzz>> taowa;
};
REFLECT_NON_INTRUSIVE(json_struct, nothing, name, happy, pi, answer, list, object, map, taowa);

int main() {
 auto j_data = jreflect::from_json<json_struct>(json_str);
 auto j_str = jreflect::to_json(j_data);
 return 0;
}
```
## Any issue is welcome, have a joy

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