// $CXX -std=c++14 -O2 -fno-exceptions -fno-rtti -Wall -Werror -pedantic-errors hello_world.cpp
// cl /std:c++14 /Ox /W3 hello_world.cpp (***)

#include <boost/di.hpp>
#include <cassert>
#include <iostream>

namespace di = boost::di;

struct iworld {
  virtual ~iworld() noexcept = default;
};
struct world : iworld {
  world() { std::cout << " world!" << std::endl; }
};

struct hello {
  explicit hello(int i) {
    assert(42 == i);
    std::cout << "hello";
  }
};

// aggregate initialization `example{hello, world}`
struct example {
  hello h;
  iworld& w;
};

int main() {
  const auto injector = di::make_injector(
    di::bind<iworld>().to<world>()
  , di::bind<>().to(42)
  );

  injector.create<example>();
}