cpp-libp2p/test/deps/di_test.cpp

/**
 * Copyright Soramitsu Co., Ltd. All Rights Reserved.
 * SPDX-License-Identifier: Apache-2.0
 */

#include <gtest/gtest.h>
#include <boost/di.hpp>

class ctor {
 public:
  explicit ctor(int i) : i(i) {}
  int i;
};

struct aggregate {
  double d;
};

class example {
 public:
  virtual ~example() = default;

  example(aggregate a, const ctor &c) {
    EXPECT_EQ(87.0, a.d);
    EXPECT_EQ(42, c.i);
  };

  virtual void func() {}
};

struct Derived : public example {
  ~Derived() override = default;

  void func() override {}
};

template <typename... T>
auto useBind() {
  return boost::di::bind<example *[]>.template to<T...>();
}

/**
 * @brief If test compiles, then DI works.
 */
TEST(Boost, DI) {
  using namespace boost;

  // clang-format off
  const auto injector = di::make_injector(
    di::bind<int>.to(42)[boost::di::override],
    di::bind<double>.to(87.0),
    useBind<Derived>()
  );
  // clang-format on

  auto a = injector.create<example>();
  auto b = injector.create<std::shared_ptr<example>>();
  auto c = injector.create<std::unique_ptr<example>>();

  (void)a;
  (void)b;
  (void)c;
}