Dealing with msgpack easily on C++

msgpack_bin.cpp

// NOTE: linear-cpp/include/any.h, binary.h, optional.h are header only.

// $ git clone --recursive https://github.com/linear-rpc/linear-cpp
// $ clang++ msgpack_bin.cpp -I linear-cpp/deps/msgpack/include -I linear-cpp/include -std=c++11
// $ ./a.out fname        # create a msgpack binary file
// $ cat fname | ./a.out  # dump it

#include <fstream>
#include <iostream>

#include "linear/any.h"

void w(const std::string& fname) {
  char b[] = {0x00, 0x01, 0x02};
  std::map<std::string, linear::type::any> m =
    {
      {"key1", 1},
      {"key2", 3.14},
      {"key3", "str in map"},
      {"key4", std::vector<linear::type::any>({ -1, -3.14, "str in vec" })},
      {"key5", linear::type::binary(b, sizeof(b))}
    };
  std::ofstream ofs(fname);
  std::stringstream buffer;
  msgpack::pack(buffer, m);
  buffer.seekg(0);
  ofs << buffer.str();
}

void r() {
    std::istreambuf_iterator<char> begin(std::cin), end;
    std::string s(begin, end);
    msgpack::object_handle oh = msgpack::unpack(s.data(), s.size());
    std::cout << "can't show msgpack::type::BIN: "
              << oh.get() << std::endl;
    std::cout << "make it readble:               "
              << linear::type::any(oh.get()).stringify() << std::endl;
}

int main(int argc, char* argv[]) {
  if (argc > 1) {
    w(argv[1]);
  } else {
    r();
  }
  return 0;
}