$$ -*- mode: c++; -*-
$var n = 10  $$ Maximum number of tuple fields we want to support.
$$ This meta comment fixes auto-indentation in Emacs. }}
// Copyright 2009 Google Inc.
// All Rights Reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Author: wan@google.com (Zhanyong Wan)

// Implements a subset of TR1 tuple needed by Google Test and Google Mock.

#ifndef GTEST_INCLUDE_GTEST_INTERAL_GTEST_TUPLE_H_
#define GTEST_INCLUDE_GTEST_INTERAL_GTEST_TUPLE_H_

#include <utility>  // For ::std::pair.


$range i 0..n-1
$range j 0..n
$range k 1..n
// GTEST_n_TUPLE_(T) is the type of an n-tuple.

$for j [[
$range m 0..j-1
#define GTEST_$(j)_TUPLE_(T) tuple<$for m, [[T##$m]]>

]]

// GTEST_n_TYPENAMES_(T) declares a list of n typenames.

$for j [[
$range m 0..j-1
#define GTEST_$(j)_TYPENAMES_(T) $for m, [[typename T##$m]]


]]

// In theory, defining stuff in the ::std namespace is undefined
// behavior.  We can do this as we are playing the role of a standard
// library vendor.
namespace std {
namespace tr1 {

template <$for i, [[typename T$i = void]]>
class tuple;

// Anything in namespace gtest_internal is Google Test's INTERNAL
// IMPLEMENTATION DETAIL and MUST NOT BE USED DIRECTLY in user code.
namespace gtest_internal {

// ByRef<T>::type is T if T is a reference; otherwise it's const T&.
template <typename T>
struct ByRef { typedef const T& type; };  // NOLINT
template <typename T>
struct ByRef<T&> { typedef T& type; };  // NOLINT

// A handy wrapper for ByRef.
#define GTEST_BY_REF_(T) typename ::std::tr1::gtest_internal::ByRef<T>::type

// AddRef<T>::type is T if T is a reference; otherwise it's T&.  This
// is the same as tr1::add_reference<T>::type.
template <typename T>
struct AddRef { typedef T& type; };  // NOLINT
template <typename T>
struct AddRef<T&> { typedef T& type; };  // NOLINT

// A handy wrapper for AddRef.
#define GTEST_ADD_REF_(T) typename ::std::tr1::gtest_internal::AddRef<T>::type

// A helper for implementing get<k>().
template <int k> class Get;

// A helper for implementing tuple_element<k, T>.  kIndexValid is true
// iff k < the number of fields in tuple type T.
template <bool kIndexValid, int kIndex, class Tuple>
struct TupleElement;


$for i [[
template <GTEST_$(n)_TYPENAMES_(T)>
struct TupleElement<true, $i, GTEST_$(n)_TUPLE_(T)> [[]]
{ typedef T$i type; };


]]
}  // namespace gtest_internal

template <>
class tuple<> {
 public:
  tuple() {}
  tuple(const tuple& /* t */)  {}
  tuple& operator=(const tuple& /* t */) { return *this; }
};


$for k [[
$range m 0..k-1
template <GTEST_$(k)_TYPENAMES_(T)>
class $if k < n [[GTEST_$(k)_TUPLE_(T)]] $else [[tuple]] {
 public:
  template <int k> friend class gtest_internal::Get;
  template <GTEST_$(n)_TYPENAMES_(U)> friend class tuple;

  tuple() {}

  explicit tuple($for m, [[GTEST_BY_REF_(T$m) f$m]]) : [[]]
$for m, [[f$(m)_(f$m)]] {}

  tuple(const tuple& t) : $for m, [[f$(m)_(t.f$(m)_)]] {}

  template <GTEST_$(k)_TYPENAMES_(U)>
  tuple(const GTEST_$(k)_TUPLE_(U)& t) : $for m, [[f$(m)_(t.f$(m)_)]] {}

$if k == 2 [[
  template <typename U0, typename U1>
  tuple(const ::std::pair<U0, U1>& p) : f0_(p.first), f1_(p.second) {}

]]

  tuple& operator=(const tuple& t) { return CopyFrom(t); }

  template <GTEST_$(k)_TYPENAMES_(U)>
  tuple& operator=(const GTEST_$(k)_TUPLE_(U)& t) {
    return CopyFrom(t);
  }

$if k == 2 [[
  template <typename U0, typename U1>
  tuple& operator=(const ::std::pair<U0, U1>& p) {
    f0_ = p.first;
    f1_ = p.second;
    return *this;
  }

]]

 private:
  template <GTEST_$(k)_TYPENAMES_(U)>
  tuple& CopyFrom(const GTEST_$(k)_TUPLE_(U)& t) {

$for m [[
    f$(m)_ = t.f$(m)_;

]]
    return *this;
  }


$for m [[
  T$m f$(m)_;

]]
};


]]
// 6.1.3.2 Tuple creation functions.

// Known limitations: we don't support passing an
// std::tr1::reference_wrapper<T> to make_tuple().  And we don't
// implement tie().

inline tuple<> make_tuple() { return tuple<>(); }

$for k [[
$range m 0..k-1

template <GTEST_$(k)_TYPENAMES_(T)>
inline GTEST_$(k)_TUPLE_(T) make_tuple($for m, [[const T$m& f$m]]) {
  return GTEST_$(k)_TUPLE_(T)($for m, [[f$m]]);
}

]]

// 6.1.3.3 Tuple helper classes.

template <typename Tuple> struct tuple_size;


$for j [[
template <GTEST_$(j)_TYPENAMES_(T)>
struct tuple_size<GTEST_$(j)_TUPLE_(T)> { static const int value = $j; };


]]
template <int k, class Tuple>
struct tuple_element {
  typedef typename gtest_internal::TupleElement<
      k < (tuple_size<Tuple>::value), k, Tuple>::type type;
};

#define GTEST_TUPLE_ELEMENT_(k, Tuple) typename tuple_element<k, Tuple >::type

// 6.1.3.4 Element access.

namespace gtest_internal {


$for i [[
template <>
class Get<$i> {
 public:
  template <class Tuple>
  static GTEST_ADD_REF_(GTEST_TUPLE_ELEMENT_($i, Tuple))
  Field(Tuple& t) { return t.f$(i)_; }  // NOLINT

  template <class Tuple>
  static GTEST_BY_REF_(GTEST_TUPLE_ELEMENT_($i, Tuple))
  ConstField(const Tuple& t) { return t.f$(i)_; }
};


]]
}  // namespace gtest_internal

template <int k, GTEST_$(n)_TYPENAMES_(T)>
GTEST_ADD_REF_(GTEST_TUPLE_ELEMENT_(k, GTEST_$(n)_TUPLE_(T)))
get(GTEST_$(n)_TUPLE_(T)& t) {
  return gtest_internal::Get<k>::Field(t);
}

template <int k, GTEST_$(n)_TYPENAMES_(T)>
GTEST_BY_REF_(GTEST_TUPLE_ELEMENT_(k,  GTEST_$(n)_TUPLE_(T)))
get(const GTEST_$(n)_TUPLE_(T)& t) {
  return gtest_internal::Get<k>::ConstField(t);
}

// 6.1.3.5 Relational operators

// We only implement == and !=, as we don't have a need for the rest yet.

namespace gtest_internal {

// SameSizeTuplePrefixComparator<k, k>::Eq(t1, t2) returns true if the
// first k fields of t1 equals the first k fields of t2.
// SameSizeTuplePrefixComparator(k1, k2) would be a compiler error if
// k1 != k2.
template <int kSize1, int kSize2>
struct SameSizeTuplePrefixComparator;

template <>
struct SameSizeTuplePrefixComparator<0, 0> {
  template <class Tuple1, class Tuple2>
  static bool Eq(const Tuple1& /* t1 */, const Tuple2& /* t2 */) {
    return true;
  }
};

template <int k>
struct SameSizeTuplePrefixComparator<k, k> {
  template <class Tuple1, class Tuple2>
  static bool Eq(const Tuple1& t1, const Tuple2& t2) {
    return SameSizeTuplePrefixComparator<k - 1, k - 1>::Eq(t1, t2) &&
        ::std::tr1::get<k - 1>(t1) == ::std::tr1::get<k - 1>(t2);
  }
};

}  // namespace gtest_internal

template <GTEST_$(n)_TYPENAMES_(T), GTEST_$(n)_TYPENAMES_(U)>
inline bool operator==(const GTEST_$(n)_TUPLE_(T)& t,
                       const GTEST_$(n)_TUPLE_(U)& u) {
  return gtest_internal::SameSizeTuplePrefixComparator<
      tuple_size<GTEST_$(n)_TUPLE_(T)>::value,
      tuple_size<GTEST_$(n)_TUPLE_(U)>::value>::Eq(t, u);
}

template <GTEST_$(n)_TYPENAMES_(T), GTEST_$(n)_TYPENAMES_(U)>
inline bool operator!=(const GTEST_$(n)_TUPLE_(T)& t,
                       const GTEST_$(n)_TUPLE_(U)& u) { return !(t == u); }

// 6.1.4 Pairs.
// Unimplemented.

}  // namespace tr1
}  // namespace std


$for j [[
#undef GTEST_$(j)_TUPLE_

]]


$for j [[
#undef GTEST_$(j)_TYPENAMES_

]]

#undef GTEST_BY_REF_
#undef GTEST_ADD_REF_
#undef GTEST_TUPLE_ELEMENT_

#endif  // GTEST_INCLUDE_GTEST_INTERAL_GTEST_TUPLE_H_