Hu Chunming / sip_server

  /*=============================================================================
      Copyright (c) 2017 Paul Fultz II
      lazy.cpp
      Distributed under the Boost Software License, Version 1.0. (See accompanying
      file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
  ==============================================================================*/
  #include <boost/hof/lazy.hpp>
  #include <memory>
  #include "test.hpp"
  
  template<int N>
  struct test_placeholder
  {};
  
  namespace std {
      template<int N>
      struct is_placeholder<test_placeholder<N>>
      : std::integral_constant<int, N>
      {};
  }
  
  BOOST_HOF_TEST_CASE()
  {
      int i = 5;
  
      static_assert(std::is_reference<decltype(boost::hof::detail::ref_transformer()(std::ref(i))(0,0,0))>::value, "Reference wrapper failed");
      static_assert(std::is_reference<decltype(boost::hof::detail::pick_transformer(std::ref(i))(0,0,0))>::value, "Reference wrapper failed");
      static_assert(std::is_reference<decltype(boost::hof::detail::lazy_transform(std::ref(i), boost::hof::pack_basic(0,0,0)))>::value, "Reference wrapper failed");
  
      BOOST_HOF_TEST_CHECK(&boost::hof::detail::ref_transformer()(std::ref(i))(0,0,0) == &i);
      BOOST_HOF_TEST_CHECK(&boost::hof::detail::pick_transformer(std::ref(i))(0,0,0) == &i);
      BOOST_HOF_TEST_CHECK(&boost::hof::detail::lazy_transform(std::ref(i), boost::hof::pack_basic(0,0,0)) == &i);
  }
  
  BOOST_HOF_TEST_CASE()
  {
      int i = 5;
  
      BOOST_HOF_TEST_CHECK(boost::hof::detail::id_transformer()(i)(0,0,0) == i);
      BOOST_HOF_TEST_CHECK(boost::hof::detail::pick_transformer(i)(0,0,0) == i);
      BOOST_HOF_TEST_CHECK(boost::hof::detail::lazy_transform(i, boost::hof::pack_basic(0,0,0)) == i);
  }
  
  BOOST_HOF_TEST_CASE()
  {
      auto id =[](int i){ return i;};
      auto fi = std::bind(id, 5);
  
      BOOST_HOF_TEST_CHECK(boost::hof::detail::bind_transformer()(fi)(0,0,0) == id(5));
      BOOST_HOF_TEST_CHECK(boost::hof::detail::pick_transformer(fi)(0,0,0) == id(5));
      BOOST_HOF_TEST_CHECK(boost::hof::detail::lazy_transform(fi, boost::hof::pack_basic(0,0,0)) == id(5));
  }
  
  struct f_0 {
  constexpr long operator()() const
  {
      return 17041L;
  }
  };
  
  struct f_1 {
  constexpr long operator()(long a) const
  {
      return a;
  }
  };
  
  struct f_2 {
  constexpr long operator()(long a, long b) const
  {
      return a + 10 * b;
  }
  };
  
  static long global_result;
  
  struct fv_0 {
  void operator()() const
  {
      global_result = 17041L;
  }
  };
  
  struct fv_1 {
  void operator()(long a) const
  {
      global_result = a;
  }
  };
  
  struct fv_2 {
  void operator()(long a, long b) const
  {
      global_result = a + 10 * b;
  }
  };
  
  struct Y
  {
      short operator()(short & r) const { return ++r; }
      int operator()(int a, int b) const { return a + 10 * b; }
      long operator() (long a, long b, long c) const { return a + 10 * b + 100 * c; }
      void operator() (long a, long b, long c, long d) const { global_result = a + 10 * b + 100 * c + 1000 * d; }
  };
  
  BOOST_HOF_TEST_CASE()
  {
      short i(6);
  
      int const k = 3;
  
      BOOST_HOF_TEST_CHECK( boost::hof::lazy(Y())( std::ref(i))() == 7 );
      BOOST_HOF_TEST_CHECK( boost::hof::lazy(Y())( std::ref(i))() == 8 );
      BOOST_HOF_TEST_CHECK( boost::hof::lazy(Y())( i,std::placeholders::_1)(k) == 38 );
      BOOST_HOF_TEST_CHECK( boost::hof::lazy(Y())( i,std::placeholders::_1, 9)(k) == 938 );
  
      global_result = 0;
      boost::hof::lazy(Y())( i,std::placeholders::_1, 9, 4)(k);
      BOOST_HOF_TEST_CHECK( global_result == 4938 );
  
  }
  
  BOOST_HOF_TEST_CASE()
  {
      int const x = 1;
      int const y = 2;
  
      BOOST_HOF_TEST_CHECK( boost::hof::lazy(f_1())( boost::hof::lazy(f_1())(std::placeholders::_1))(x) == 1L );
      BOOST_HOF_TEST_CHECK( boost::hof::lazy(f_1())( boost::hof::lazy(f_2())(std::placeholders::_1, std::placeholders::_2))(x, y) == 21L );
      BOOST_HOF_TEST_CHECK( boost::hof::lazy(f_2())( boost::hof::lazy(f_1())(std::placeholders::_1), boost::hof::lazy(f_1())(std::placeholders::_1))(x) == 11L );
      BOOST_HOF_TEST_CHECK( boost::hof::lazy(f_2())( boost::hof::lazy(f_1())(std::placeholders::_1), boost::hof::lazy(f_1())( std::placeholders::_2))(x, y) == 21L );
      BOOST_HOF_TEST_CHECK( boost::hof::lazy(f_1())( boost::hof::lazy(f_0())())() == 17041L );
  
      BOOST_HOF_STATIC_TEST_CHECK( boost::hof::lazy(f_1())( boost::hof::lazy(f_1())(test_placeholder<1>()))(x) == 1L );
      BOOST_HOF_STATIC_TEST_CHECK( boost::hof::lazy(f_1())( boost::hof::lazy(f_2())(test_placeholder<1>(), test_placeholder<2>()))(x, y) == 21L );
      BOOST_HOF_STATIC_TEST_CHECK( boost::hof::lazy(f_2())( boost::hof::lazy(f_1())(test_placeholder<1>()), boost::hof::lazy(f_1())(test_placeholder<1>()))(x) == 11L );
      BOOST_HOF_STATIC_TEST_CHECK( boost::hof::lazy(f_2())( boost::hof::lazy(f_1())(test_placeholder<1>()), boost::hof::lazy(f_1())( test_placeholder<2>()))(x, y) == 21L );
      BOOST_HOF_STATIC_TEST_CHECK( boost::hof::lazy(f_1())( boost::hof::lazy(f_0())())() == 17041L );
  
      BOOST_HOF_TEST_CHECK( (boost::hof::lazy(fv_1())( boost::hof::lazy(f_1())(std::placeholders::_1))(x), (global_result == 1L)) );
      BOOST_HOF_TEST_CHECK( (boost::hof::lazy(fv_1())( boost::hof::lazy(f_2())(std::placeholders::_1, std::placeholders::_2))(x, y), (global_result == 21L)) );
      BOOST_HOF_TEST_CHECK( (boost::hof::lazy(fv_2())( boost::hof::lazy(f_1())(std::placeholders::_1), boost::hof::lazy(f_1())(std::placeholders::_1))(x), (global_result == 11L)) );
      BOOST_HOF_TEST_CHECK( (boost::hof::lazy(fv_2())( boost::hof::lazy(f_1())(std::placeholders::_1), boost::hof::lazy(f_1())( std::placeholders::_2))(x, y), (global_result == 21L)) );
      BOOST_HOF_TEST_CHECK( (boost::hof::lazy(fv_1())( boost::hof::lazy(f_0())())(), (global_result == 17041L)) );
  }
  
  
  struct X
  {
      mutable unsigned int hash;
  
      X(): hash(0) {}
  
      int f0() { f1(17); return 0; }
      int g0() const { g1(17); return 0; }
  
      int f1(int a1) { hash = (hash * 17041 + a1) % 32768; return 0; }
      int g1(int a1) const { hash = (hash * 17041 + a1 * 2) % 32768; return 0; }
  
      int f2(int a1, int a2) { f1(a1); f1(a2); return 0; }
      int g2(int a1, int a2) const { g1(a1); g1(a2); return 0; }
  
      int f3(int a1, int a2, int a3) { f2(a1, a2); f1(a3); return 0; }
      int g3(int a1, int a2, int a3) const { g2(a1, a2); g1(a3); return 0; }
  
      int f4(int a1, int a2, int a3, int a4) { f3(a1, a2, a3); f1(a4); return 0; }
      int g4(int a1, int a2, int a3, int a4) const { g3(a1, a2, a3); g1(a4); return 0; }
  
      int f5(int a1, int a2, int a3, int a4, int a5) { f4(a1, a2, a3, a4); f1(a5); return 0; }
      int g5(int a1, int a2, int a3, int a4, int a5) const { g4(a1, a2, a3, a4); g1(a5); return 0; }
  
      int f6(int a1, int a2, int a3, int a4, int a5, int a6) { f5(a1, a2, a3, a4, a5); f1(a6); return 0; }
      int g6(int a1, int a2, int a3, int a4, int a5, int a6) const { g5(a1, a2, a3, a4, a5); g1(a6); return 0; }
  
      int f7(int a1, int a2, int a3, int a4, int a5, int a6, int a7) { f6(a1, a2, a3, a4, a5, a6); f1(a7); return 0; }
      int g7(int a1, int a2, int a3, int a4, int a5, int a6, int a7) const { g6(a1, a2, a3, a4, a5, a6); g1(a7); return 0; }
  
      int f8(int a1, int a2, int a3, int a4, int a5, int a6, int a7, int a8) { f7(a1, a2, a3, a4, a5, a6, a7); f1(a8); return 0; }
      int g8(int a1, int a2, int a3, int a4, int a5, int a6, int a7, int a8) const { g7(a1, a2, a3, a4, a5, a6, a7); g1(a8); return 0; }
  };
  
  struct V
  {
      mutable unsigned int hash;
  
      V(): hash(0) {}
  
      void f0() { f1(17); }
      void g0() const { g1(17); }
  
      void f1(int a1) { hash = (hash * 17041 + a1) % 32768; }
      void g1(int a1) const { hash = (hash * 17041 + a1 * 2) % 32768; }
  
      void f2(int a1, int a2) { f1(a1); f1(a2); }
      void g2(int a1, int a2) const { g1(a1); g1(a2); }
  
      void f3(int a1, int a2, int a3) { f2(a1, a2); f1(a3); }
      void g3(int a1, int a2, int a3) const { g2(a1, a2); g1(a3); }
  
      void f4(int a1, int a2, int a3, int a4) { f3(a1, a2, a3); f1(a4); }
      void g4(int a1, int a2, int a3, int a4) const { g3(a1, a2, a3); g1(a4); }
  
      void f5(int a1, int a2, int a3, int a4, int a5) { f4(a1, a2, a3, a4); f1(a5); }
      void g5(int a1, int a2, int a3, int a4, int a5) const { g4(a1, a2, a3, a4); g1(a5); }
  
      void f6(int a1, int a2, int a3, int a4, int a5, int a6) { f5(a1, a2, a3, a4, a5); f1(a6); }
      void g6(int a1, int a2, int a3, int a4, int a5, int a6) const { g5(a1, a2, a3, a4, a5); g1(a6); }
  
      void f7(int a1, int a2, int a3, int a4, int a5, int a6, int a7) { f6(a1, a2, a3, a4, a5, a6); f1(a7); }
      void g7(int a1, int a2, int a3, int a4, int a5, int a6, int a7) const { g6(a1, a2, a3, a4, a5, a6); g1(a7); }
  
      void f8(int a1, int a2, int a3, int a4, int a5, int a6, int a7, int a8) { f7(a1, a2, a3, a4, a5, a6, a7); f1(a8); }
      void g8(int a1, int a2, int a3, int a4, int a5, int a6, int a7, int a8) const { g7(a1, a2, a3, a4, a5, a6, a7); g1(a8); }
  };
  
  BOOST_HOF_TEST_CASE()
  {
  
      X x;
  
      // 0
  
      boost::hof::lazy(&X::f0)(&x)();
      boost::hof::lazy(&X::f0)(std::ref(x))();
  
      boost::hof::lazy(&X::g0)(&x)();
      boost::hof::lazy(&X::g0)(x)();
      boost::hof::lazy(&X::g0)(std::ref(x))();
  
      // 1
  
      boost::hof::lazy(&X::f1)(&x, 1)();
      boost::hof::lazy(&X::f1)(std::ref(x), 1)();
  
      boost::hof::lazy(&X::g1)(&x, 1)();
      boost::hof::lazy(&X::g1)(x, 1)();
      boost::hof::lazy(&X::g1)(std::ref(x), 1)();
  
      // 2
  
      boost::hof::lazy(&X::f2)(&x, 1, 2)();
      boost::hof::lazy(&X::f2)(std::ref(x), 1, 2)();
  
      boost::hof::lazy(&X::g2)(&x, 1, 2)();
      boost::hof::lazy(&X::g2)(x, 1, 2)();
      boost::hof::lazy(&X::g2)(std::ref(x), 1, 2)();
  
      // 3
  
      boost::hof::lazy(&X::f3)(&x, 1, 2, 3)();
      boost::hof::lazy(&X::f3)(std::ref(x), 1, 2, 3)();
  
      boost::hof::lazy(&X::g3)(&x, 1, 2, 3)();
      boost::hof::lazy(&X::g3)(x, 1, 2, 3)();
      boost::hof::lazy(&X::g3)(std::ref(x), 1, 2, 3)();
  
      // 4
  
      boost::hof::lazy(&X::f4)(&x, 1, 2, 3, 4)();
      boost::hof::lazy(&X::f4)(std::ref(x), 1, 2, 3, 4)();
  
      boost::hof::lazy(&X::g4)(&x, 1, 2, 3, 4)();
      boost::hof::lazy(&X::g4)(x, 1, 2, 3, 4)();
      boost::hof::lazy(&X::g4)(std::ref(x), 1, 2, 3, 4)();
  
      // 5
  
      boost::hof::lazy(&X::f5)(&x, 1, 2, 3, 4, 5)();
      boost::hof::lazy(&X::f5)(std::ref(x), 1, 2, 3, 4, 5)();
  
      boost::hof::lazy(&X::g5)(&x, 1, 2, 3, 4, 5)();
      boost::hof::lazy(&X::g5)(x, 1, 2, 3, 4, 5)();
      boost::hof::lazy(&X::g5)(std::ref(x), 1, 2, 3, 4, 5)();
  
      // 6
  
      boost::hof::lazy(&X::f6)(&x, 1, 2, 3, 4, 5, 6)();
      boost::hof::lazy(&X::f6)(std::ref(x), 1, 2, 3, 4, 5, 6)();
  
      boost::hof::lazy(&X::g6)(&x, 1, 2, 3, 4, 5, 6)();
      boost::hof::lazy(&X::g6)(x, 1, 2, 3, 4, 5, 6)();
      boost::hof::lazy(&X::g6)(std::ref(x), 1, 2, 3, 4, 5, 6)();
  
      // 7
  
      boost::hof::lazy(&X::f7)(&x, 1, 2, 3, 4, 5, 6, 7)();
      boost::hof::lazy(&X::f7)(std::ref(x), 1, 2, 3, 4, 5, 6, 7)();
  
      boost::hof::lazy(&X::g7)(&x, 1, 2, 3, 4, 5, 6, 7)();
      boost::hof::lazy(&X::g7)(x, 1, 2, 3, 4, 5, 6, 7)();
      boost::hof::lazy(&X::g7)(std::ref(x), 1, 2, 3, 4, 5, 6, 7)();
  
      // 8
  
      boost::hof::lazy(&X::f8)(&x, 1, 2, 3, 4, 5, 6, 7, 8)();
      boost::hof::lazy(&X::f8)(std::ref(x), 1, 2, 3, 4, 5, 6, 7, 8)();
  
      boost::hof::lazy(&X::g8)(&x, 1, 2, 3, 4, 5, 6, 7, 8)();
      boost::hof::lazy(&X::g8)(x, 1, 2, 3, 4, 5, 6, 7, 8)();
      boost::hof::lazy(&X::g8)(std::ref(x), 1, 2, 3, 4, 5, 6, 7, 8)();
  
      BOOST_HOF_TEST_CHECK( x.hash == 23558 );
  }
  
  BOOST_HOF_TEST_CASE()
  {
      V v;
  
      // 0
  
      boost::hof::lazy(&V::f0)(&v)();
      boost::hof::lazy(&V::f0)(std::ref(v))();
  
      boost::hof::lazy(&V::g0)(&v)();
      boost::hof::lazy(&V::g0)(v)();
      boost::hof::lazy(&V::g0)(std::ref(v))();
  
      // 1
  
      boost::hof::lazy(&V::f1)(&v, 1)();
      boost::hof::lazy(&V::f1)(std::ref(v), 1)();
  
      boost::hof::lazy(&V::g1)(&v, 1)();
      boost::hof::lazy(&V::g1)(v, 1)();
      boost::hof::lazy(&V::g1)(std::ref(v), 1)();
  
      // 2
  
      boost::hof::lazy(&V::f2)(&v, 1, 2)();
      boost::hof::lazy(&V::f2)(std::ref(v), 1, 2)();
  
      boost::hof::lazy(&V::g2)(&v, 1, 2)();
      boost::hof::lazy(&V::g2)(v, 1, 2)();
      boost::hof::lazy(&V::g2)(std::ref(v), 1, 2)();
  
      // 3
  
      boost::hof::lazy(&V::f3)(&v, 1, 2, 3)();
      boost::hof::lazy(&V::f3)(std::ref(v), 1, 2, 3)();
  
      boost::hof::lazy(&V::g3)(&v, 1, 2, 3)();
      boost::hof::lazy(&V::g3)(v, 1, 2, 3)();
      boost::hof::lazy(&V::g3)(std::ref(v), 1, 2, 3)();
  
      // 4
  
      boost::hof::lazy(&V::f4)(&v, 1, 2, 3, 4)();
      boost::hof::lazy(&V::f4)(std::ref(v), 1, 2, 3, 4)();
  
      boost::hof::lazy(&V::g4)(&v, 1, 2, 3, 4)();
      boost::hof::lazy(&V::g4)(v, 1, 2, 3, 4)();
      boost::hof::lazy(&V::g4)(std::ref(v), 1, 2, 3, 4)();
  
      // 5
  
      boost::hof::lazy(&V::f5)(&v, 1, 2, 3, 4, 5)();
      boost::hof::lazy(&V::f5)(std::ref(v), 1, 2, 3, 4, 5)();
  
      boost::hof::lazy(&V::g5)(&v, 1, 2, 3, 4, 5)();
      boost::hof::lazy(&V::g5)(v, 1, 2, 3, 4, 5)();
      boost::hof::lazy(&V::g5)(std::ref(v), 1, 2, 3, 4, 5)();
  
      // 6
  
      boost::hof::lazy(&V::f6)(&v, 1, 2, 3, 4, 5, 6)();
      boost::hof::lazy(&V::f6)(std::ref(v), 1, 2, 3, 4, 5, 6)();
  
      boost::hof::lazy(&V::g6)(&v, 1, 2, 3, 4, 5, 6)();
      boost::hof::lazy(&V::g6)(v, 1, 2, 3, 4, 5, 6)();
      boost::hof::lazy(&V::g6)(std::ref(v), 1, 2, 3, 4, 5, 6)();
  
      // 7
  
      boost::hof::lazy(&V::f7)(&v, 1, 2, 3, 4, 5, 6, 7)();
      boost::hof::lazy(&V::f7)(std::ref(v), 1, 2, 3, 4, 5, 6, 7)();
  
      boost::hof::lazy(&V::g7)(&v, 1, 2, 3, 4, 5, 6, 7)();
      boost::hof::lazy(&V::g7)(v, 1, 2, 3, 4, 5, 6, 7)();
      boost::hof::lazy(&V::g7)(std::ref(v), 1, 2, 3, 4, 5, 6, 7)();
  
      // 8
  
      boost::hof::lazy(&V::f8)(&v, 1, 2, 3, 4, 5, 6, 7, 8)();
      boost::hof::lazy(&V::f8)(std::ref(v), 1, 2, 3, 4, 5, 6, 7, 8)();
  
      boost::hof::lazy(&V::g8)(&v, 1, 2, 3, 4, 5, 6, 7, 8)();
      boost::hof::lazy(&V::g8)(v, 1, 2, 3, 4, 5, 6, 7, 8)();
      boost::hof::lazy(&V::g8)(std::ref(v), 1, 2, 3, 4, 5, 6, 7, 8)();
  
      BOOST_HOF_TEST_CHECK( v.hash == 23558 );
  }
  
  struct id
  {
      int operator()(int i) const
      {
          return i;
      }
  };
  
  BOOST_HOF_TEST_CASE()
  {
      BOOST_HOF_TEST_CHECK(boost::hof::lazy(id())(3)() == 3);
  }
  
  struct deref
  {
      int operator()(const std::unique_ptr<int>& i) const
      {
          return *i;
      }
  };
  
  BOOST_HOF_TEST_CASE()
  {
      BOOST_HOF_TEST_CHECK(boost::hof::lazy(deref())(std::unique_ptr<int>(new int(3)))() == 3);
  }
  
  void fv1( std::unique_ptr<int> p1 )
  {
      BOOST_HOF_TEST_CHECK( *p1 == 1 );
  }
  
  void fv2( std::unique_ptr<int> p1, std::unique_ptr<int> p2 )
  {
      BOOST_HOF_TEST_CHECK( *p1 == 1 );
      BOOST_HOF_TEST_CHECK( *p2 == 2 );
  }
  
  void fv3( std::unique_ptr<int> p1, std::unique_ptr<int> p2, std::unique_ptr<int> p3 )
  {
      BOOST_HOF_TEST_CHECK( *p1 == 1 );
      BOOST_HOF_TEST_CHECK( *p2 == 2 );
      BOOST_HOF_TEST_CHECK( *p3 == 3 );
  }
  
  void fv4( std::unique_ptr<int> p1, std::unique_ptr<int> p2, std::unique_ptr<int> p3, std::unique_ptr<int> p4 )
  {
      BOOST_HOF_TEST_CHECK( *p1 == 1 );
      BOOST_HOF_TEST_CHECK( *p2 == 2 );
      BOOST_HOF_TEST_CHECK( *p3 == 3 );
      BOOST_HOF_TEST_CHECK( *p4 == 4 );
  }
  
  void fv5( std::unique_ptr<int> p1, std::unique_ptr<int> p2, std::unique_ptr<int> p3, std::unique_ptr<int> p4, std::unique_ptr<int> p5 )
  {
      BOOST_HOF_TEST_CHECK( *p1 == 1 );
      BOOST_HOF_TEST_CHECK( *p2 == 2 );
      BOOST_HOF_TEST_CHECK( *p3 == 3 );
      BOOST_HOF_TEST_CHECK( *p4 == 4 );
      BOOST_HOF_TEST_CHECK( *p5 == 5 );
  }
  
  void fv6( std::unique_ptr<int> p1, std::unique_ptr<int> p2, std::unique_ptr<int> p3, std::unique_ptr<int> p4, std::unique_ptr<int> p5, std::unique_ptr<int> p6 )
  {
      BOOST_HOF_TEST_CHECK( *p1 == 1 );
      BOOST_HOF_TEST_CHECK( *p2 == 2 );
      BOOST_HOF_TEST_CHECK( *p3 == 3 );
      BOOST_HOF_TEST_CHECK( *p4 == 4 );
      BOOST_HOF_TEST_CHECK( *p5 == 5 );
      BOOST_HOF_TEST_CHECK( *p6 == 6 );
  }
  
  void fv7( std::unique_ptr<int> p1, std::unique_ptr<int> p2, std::unique_ptr<int> p3, std::unique_ptr<int> p4, std::unique_ptr<int> p5, std::unique_ptr<int> p6, std::unique_ptr<int> p7 )
  {
      BOOST_HOF_TEST_CHECK( *p1 == 1 );
      BOOST_HOF_TEST_CHECK( *p2 == 2 );
      BOOST_HOF_TEST_CHECK( *p3 == 3 );
      BOOST_HOF_TEST_CHECK( *p4 == 4 );
      BOOST_HOF_TEST_CHECK( *p5 == 5 );
      BOOST_HOF_TEST_CHECK( *p6 == 6 );
      BOOST_HOF_TEST_CHECK( *p7 == 7 );
  }
  
  void fv8( std::unique_ptr<int> p1, std::unique_ptr<int> p2, std::unique_ptr<int> p3, std::unique_ptr<int> p4, std::unique_ptr<int> p5, std::unique_ptr<int> p6, std::unique_ptr<int> p7, std::unique_ptr<int> p8 )
  {
      BOOST_HOF_TEST_CHECK( *p1 == 1 );
      BOOST_HOF_TEST_CHECK( *p2 == 2 );
      BOOST_HOF_TEST_CHECK( *p3 == 3 );
      BOOST_HOF_TEST_CHECK( *p4 == 4 );
      BOOST_HOF_TEST_CHECK( *p5 == 5 );
      BOOST_HOF_TEST_CHECK( *p6 == 6 );
      BOOST_HOF_TEST_CHECK( *p7 == 7 );
      BOOST_HOF_TEST_CHECK( *p8 == 8 );
  }
  
  void fv9( std::unique_ptr<int> p1, std::unique_ptr<int> p2, std::unique_ptr<int> p3, std::unique_ptr<int> p4, std::unique_ptr<int> p5, std::unique_ptr<int> p6, std::unique_ptr<int> p7, std::unique_ptr<int> p8, std::unique_ptr<int> p9 )
  {
      BOOST_HOF_TEST_CHECK( *p1 == 1 );
      BOOST_HOF_TEST_CHECK( *p2 == 2 );
      BOOST_HOF_TEST_CHECK( *p3 == 3 );
      BOOST_HOF_TEST_CHECK( *p4 == 4 );
      BOOST_HOF_TEST_CHECK( *p5 == 5 );
      BOOST_HOF_TEST_CHECK( *p6 == 6 );
      BOOST_HOF_TEST_CHECK( *p7 == 7 );
      BOOST_HOF_TEST_CHECK( *p8 == 8 );
      BOOST_HOF_TEST_CHECK( *p9 == 9 );
  }
  
  BOOST_HOF_TEST_CASE()
  {
      std::unique_ptr<int> p1( new int(1) );
  
      boost::hof::lazy( fv1 )( std::placeholders::_1 )( std::move( p1 ) );
  }
  BOOST_HOF_TEST_CASE()
  {
      std::unique_ptr<int> p1( new int(1) );
      std::unique_ptr<int> p2( new int(2) );
  
      boost::hof::lazy( fv2 )( std::placeholders::_1, std::placeholders::_2 )( std::move( p1 ), std::move( p2 ) );
  }
  BOOST_HOF_TEST_CASE()
  {
      std::unique_ptr<int> p1( new int(1) );
      std::unique_ptr<int> p2( new int(2) );
      std::unique_ptr<int> p3( new int(3) );
  
      boost::hof::lazy( fv3 )( std::placeholders::_1, std::placeholders::_2, std::placeholders::_3 )( std::move( p1 ), std::move( p2 ), std::move( p3 ) );
  }
  BOOST_HOF_TEST_CASE()
  {
      std::unique_ptr<int> p1( new int(1) );
      std::unique_ptr<int> p2( new int(2) );
      std::unique_ptr<int> p3( new int(3) );
      std::unique_ptr<int> p4( new int(4) );
  
      boost::hof::lazy( fv4 )( std::placeholders::_1, std::placeholders::_2, std::placeholders::_3, std::placeholders::_4 )( std::move( p1 ), std::move( p2 ), std::move( p3 ), std::move( p4 ) );
  }
  BOOST_HOF_TEST_CASE()
  {
      std::unique_ptr<int> p1( new int(1) );
      std::unique_ptr<int> p2( new int(2) );
      std::unique_ptr<int> p3( new int(3) );
      std::unique_ptr<int> p4( new int(4) );
      std::unique_ptr<int> p5( new int(5) );
  
      boost::hof::lazy( fv5 )( std::placeholders::_1, std::placeholders::_2, std::placeholders::_3, std::placeholders::_4, std::placeholders::_5 )( std::move( p1 ), std::move( p2 ), std::move( p3 ), std::move( p4 ), std::move( p5 ) );
  }
  BOOST_HOF_TEST_CASE()
  {
      std::unique_ptr<int> p1( new int(1) );
      std::unique_ptr<int> p2( new int(2) );
      std::unique_ptr<int> p3( new int(3) );
      std::unique_ptr<int> p4( new int(4) );
      std::unique_ptr<int> p5( new int(5) );
      std::unique_ptr<int> p6( new int(6) );
  
      boost::hof::lazy( fv6 )( std::placeholders::_1, std::placeholders::_2, std::placeholders::_3, std::placeholders::_4, std::placeholders::_5, std::placeholders::_6 )( std::move( p1 ), std::move( p2 ), std::move( p3 ), std::move( p4 ), std::move( p5 ), std::move( p6 ) );
  }
  BOOST_HOF_TEST_CASE()
  {
      std::unique_ptr<int> p1( new int(1) );
      std::unique_ptr<int> p2( new int(2) );
      std::unique_ptr<int> p3( new int(3) );
      std::unique_ptr<int> p4( new int(4) );
      std::unique_ptr<int> p5( new int(5) );
      std::unique_ptr<int> p6( new int(6) );
      std::unique_ptr<int> p7( new int(7) );
  
      boost::hof::lazy( fv7 )( std::placeholders::_1, std::placeholders::_2, std::placeholders::_3, std::placeholders::_4, std::placeholders::_5, std::placeholders::_6, std::placeholders::_7 )( std::move( p1 ), std::move( p2 ), std::move( p3 ), std::move( p4 ), std::move( p5 ), std::move( p6 ), std::move( p7 ) );
  }
  BOOST_HOF_TEST_CASE()
  {
      std::unique_ptr<int> p1( new int(1) );
      std::unique_ptr<int> p2( new int(2) );
      std::unique_ptr<int> p3( new int(3) );
      std::unique_ptr<int> p4( new int(4) );
      std::unique_ptr<int> p5( new int(5) );
      std::unique_ptr<int> p6( new int(6) );
      std::unique_ptr<int> p7( new int(7) );
      std::unique_ptr<int> p8( new int(8) );
  
      boost::hof::lazy( fv8 )( std::placeholders::_1, std::placeholders::_2, std::placeholders::_3, std::placeholders::_4, std::placeholders::_5, std::placeholders::_6, std::placeholders::_7, std::placeholders::_8 )( std::move( p1 ), std::move( p2 ), std::move( p3 ), std::move( p4 ), std::move( p5 ), std::move( p6 ), std::move( p7 ), std::move( p8 ) );
  }
  BOOST_HOF_TEST_CASE()
  {
      std::unique_ptr<int> p1( new int(1) );
      std::unique_ptr<int> p2( new int(2) );
      std::unique_ptr<int> p3( new int(3) );
      std::unique_ptr<int> p4( new int(4) );
      std::unique_ptr<int> p5( new int(5) );
      std::unique_ptr<int> p6( new int(6) );
      std::unique_ptr<int> p7( new int(7) );
      std::unique_ptr<int> p8( new int(8) );
      std::unique_ptr<int> p9( new int(9) );
  
      boost::hof::lazy( fv9 )( std::placeholders::_1, std::placeholders::_2, std::placeholders::_3, std::placeholders::_4, std::placeholders::_5, std::placeholders::_6, std::placeholders::_7, std::placeholders::_8, std::placeholders::_9 )( std::move( p1 ), std::move( p2 ), std::move( p3 ), std::move( p4 ), std::move( p5 ), std::move( p6 ), std::move( p7 ), std::move( p8 ), std::move( p9 ) );
  }
  
  
  struct X_ref
  {
      int f( int x )
      {
          return x;
      }
  
      int g( int x ) const
      {
          return -x;
      }
  };
  
  BOOST_HOF_TEST_CASE()
  {
      X_ref x;
  
      BOOST_HOF_TEST_CHECK( boost::hof::lazy( &X_ref::f )( std::ref( x ), std::placeholders::_1 )( 1 ) == 1 );
      BOOST_HOF_TEST_CHECK( boost::hof::lazy( &X_ref::g )( std::cref( x ), std::placeholders::_1 )( 2 ) == -2 );
  }
  
  BOOST_HOF_TEST_CASE()
  {
      auto lazy_f_1 = boost::hof::lazy(f_1())(std::placeholders::_1);
      static_assert(boost::hof::is_invocable<decltype(lazy_f_1), long>::value, "Invocable");
      static_assert(boost::hof::is_invocable<decltype(lazy_f_1), long, long>::value, "Invocable");
      
      auto lazy_f_2 = boost::hof::lazy(f_2())(std::placeholders::_1, std::placeholders::_2);
      static_assert(boost::hof::is_invocable<decltype(lazy_f_2), long, long>::value, "Invocable");
      static_assert(!boost::hof::is_invocable<decltype(lazy_f_2), long>::value, "Not SFINAE-friendly");
  }
  
  struct dummy_unary_fn
  {
      template <typename S>
      int operator()(S const &) const { return 0; }
  };
  
  struct bad_unary_fn
  {
      template <typename S>
      constexpr int operator()(S const &) const
      {
          static_assert(!std::is_same<S, S>::value, "Failure");
          return 0;
      }
  };
  
  BOOST_HOF_TEST_CASE()
  {
      auto b = boost::hof::lazy(dummy_unary_fn())(bad_unary_fn());
      b(0);
  }
  
  
  struct by_value_fn
  {
      template<typename T, typename U>
      void operator()(T &&, U &&) const
      {
          static_assert(std::is_same<U, int>::value, "");
      }
  };
  
  BOOST_HOF_TEST_CASE()
  {
      boost::hof::lazy(by_value_fn{})(std::placeholders::_1, 42)("hello");
  }
  
  #if BOOST_HOF_HAS_NOEXCEPT_DEDUCTION
  struct copy_throws 
  {
      copy_throws() {}
      copy_throws(copy_throws const&) {}
      copy_throws(copy_throws&&) noexcept {}
  };
  
  struct no_throw_fo 
  {
      void operator()() const noexcept {}
      void operator()(int) const noexcept {}
      void operator()(copy_throws) const noexcept {}
  };
  
  struct throws_fo 
  {
      void operator()() const {}
  };
  
  struct member_obj 
  {
      int x;
  };
  
  BOOST_HOF_TEST_CASE()
  {
      no_throw_fo obj;
      copy_throws arg;
      static_assert(noexcept(boost::hof::lazy(no_throw_fo{})()()), "noexcept lazy");
      static_assert(noexcept(boost::hof::lazy(obj)()()), "noexcept lazy");
      static_assert(!noexcept(boost::hof::lazy(obj)(arg)()), "noexcept lazy");
      static_assert(noexcept(boost::hof::lazy(obj)(1)()), "noexcept lazy");
      static_assert(noexcept(boost::hof::lazy(obj)(std::placeholders::_1)), "noexcept lazy");
      // static_assert(noexcept(boost::hof::lazy(obj)(std::placeholders::_1)()), "noexcept lazy");
      static_assert(noexcept(boost::hof::lazy(obj)(std::placeholders::_1)(1)), "noexcept lazy");
      static_assert(!noexcept(boost::hof::lazy(obj)(std::placeholders::_1)(arg)), "noexcept lazy");
  
      static_assert(noexcept(boost::hof::lazy(obj)(std::move(arg))), "noexcept lazy");
      static_assert(!noexcept(boost::hof::lazy(obj)(std::move(arg))()), "noexcept lazy");
  }
  BOOST_HOF_TEST_CASE()
  {
      throws_fo obj;
      static_assert(!noexcept(boost::hof::lazy(obj)()()), "noexcept lazy");
  }
  BOOST_HOF_TEST_CASE()
  {
      member_obj obj{42};
      static_assert(noexcept(boost::hof::lazy(&member_obj::x)(obj)()), "noexcept lazy");
      static_assert(noexcept(boost::hof::lazy(&member_obj::x)(std::placeholders::_1)(obj)), "noexcept lazy");
  }
  #endif