parse.cpp

#include <iostream>
#include <pre/json/from_json.hpp>


struct tool {

  std::string url;
  std::string sha1;
  std::string root;
};

BOOST_FUSION_ADAPT_STRUCT(tool, url, sha1, root);


int main(int argc, char** argv) {

  std::string jsontoparse = R"(
{
  "polly": {
    "all": {
      "universal": {
        "url": "https://github.com/nxxm/polly/archive/21f329fa47f776440ba47f3e90219bad18ff820b.zip",
        "sha1": "15f806c905f71176ab7ff72996f433a9b3e261d9",
        "root": "polly-21f329fa47f776440ba47f3e90219bad18ff820b"
      }
    }
  },
  "hunter": {
    "all": {
      "universal": {
        "url": "https://github.com/nxxm/hunter/archive/4d2df6b5f29c204b4b03cf4da85db7f491af57c4.zip",
        "sha1": "759eb1f422c257cba613f871fa64af461d35ae34",
        "root": "hunter-4d2df6b5f29c204b4b03cf4da85db7f491af57c4/"
      }
    }
  }
}


  )";

  using platforms = std::map<std::string, std::map<std::string, tool>>;
  using all_tools = std::map<std::string, platforms>;

  auto yougetthem  = pre::json::from_json<all_tools>(jsontoparse);

  for (auto& platform : yougetthem) {
    std::cout << platform.first << " -- ";
    for ( auto tool_for_platform : platform.second) {
      std::cout <<  "platform : " << tool_for_platform.first << " : " << tool_for_platform.second["universal"].url << std::endl; 
    }
  }

  return 0;
}