开源库地址：　https://github.com/bk192077/struct_mapping.git

支持结构体，std::strng, std::vcetor, std::list, std::map, std::multimap等类型

注意：需要std c++17 及以上版本支持

测试程序：

#include "struct_mapping/struct_mapping.h"

#include <list>
#include <iostream>
#include <map>
#include <sstream>
#include <string>
#include <vector>

struct Point
{
	Point()
	{
		struct_mapping::reg(&Point::x, "x");
		struct_mapping::reg(&Point::y, "y");	
		struct_mapping::reg(&Point::z, "z");

	}

	double x = 0.1;
	double y = 0.2;
	double z = 0.3;
};

struct LL
{
	LL()
	{
		struct_mapping::reg(&LL::str, "str");
		struct_mapping::reg(&LL::mlt, "mlt");
	}
	std::string str = "abc";
	std::map<std::string ,int> mlt = {{"zero", 0}, {"one", 1}, {"two", 2}};
};

struct President
{
	President()
	{
		struct_mapping::reg(&President::name, "name");
		struct_mapping::reg(&President::mass, "mass");
		struct_mapping::reg(&President::vec, "vec");
		struct_mapping::reg(&President::lst, "lst");
		struct_mapping::reg(&President::l, "l");
	}
	std::string name="xiaoli-feidao";
	double mass=123.4;
	std::vector<int> vec={1,2,3,4,5};
	std::list<std::string> lst={"abc","def"};
	LL l;
};

struct USA
{
	USA()
	{
		struct_mapping::reg(&USA::president, "president");
	}

	President president;
};

int main()
{
	USA u;
	std::ostringstream out;
	struct_mapping::map_struct_to_json(u, out, " ");//something out stream directly
	std::cout << std::endl;

#if 0
	std::cout << out.str() << std::endl;
#endif
	
	u.president.name = "JACK-LEE";
  u.president.mass = 76.5;
	u.president.lst.push_back("Zara");
	u.president.l.str="Scientific Persons";
	u.president.l.mlt["aaa"] = -2;
	u.president.l.mlt["bbb"] = -1;
	struct_mapping::map_struct_to_json(u, out, " ");
	std::cout << out.str() << std::endl;

#if 0		
	LL AB;
	AB.str = "Scientific Persons";
	AB.mlt["aaa"] = -2;
	AB.mlt["bbb"] = -1;
	struct_mapping::map_struct_to_json(AB, out, "	");
	std::cout << std::endl << out.str() << std::endl;
#endif
}

构建指令：　g++ ./struct-lys.cpp -std=c++17 -o sl.out -I /home/lys/usr/local/include

运行结果

{
 "president": {
  "name": "xiaoli-feidao",
  "mass": 123.4,
  "vec": [
   1,
   2,
   3,
   4,
   5
  ],
  "lst": [
   "abc",
   "def"
  ],
  "l": {
   "str": "abc",
   "mlt": {
    "one": 1,
    "two": 2,
    "zero": 0
   }
  }
 }
}{
 "president": {
  "name": "JACK-LEE",
  "mass": 76.5,
  "vec": [
   1,
   2,
   3,
   4,
   5
  ],
  "lst": [
   "abc",
   "def",
   "Zara"
  ],
  "l": {
   "str": "Scientific Persons",
   "mlt": {
    "aaa": -2,
    "bbb": -1,
    "one": 1,
    "two": 2,
    "zero": 0
   }
  }
 }
}