Esempi in C++ (Cpp) per iter::starmap

Esempio n. 1

    int operator()(int a) {
      return a;
    }
  };
}

TEST_CASE("starmap: works with function pointer and lambda", "[starmap]") {
  using Vec = const std::vector<int>;
  const std::vector<std::pair<double, int>> v1 = {{1l, 2}, {3l, 11}, {6l, 7}};
  Vec vc = {2l, 33l, 42l};

  std::vector<int> v;
  SECTION("with function") {
    SECTION("Normal call") {
      auto sm = starmap(f, v1);
      v.assign(std::begin(sm), std::end(sm));
    }
    SECTION("pipe") {
      auto sm = v1 | starmap(f);
      v.assign(std::begin(sm), std::end(sm));
    }
  }

  SECTION("with lambda") {
    auto sm = starmap([](long a, int b) { return a * b; }, v1);
    v.assign(std::begin(sm), std::end(sm));
  }
  REQUIRE(v == vc);
}