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      3 // Copyright 2009 Google Inc.
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     30 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     31 //
     32 // Author: wan (at) google.com (Zhanyong Wan)
     33 
     34 // Implements a subset of TR1 tuple needed by Google Test and Google Mock.
     35 
     36 #ifndef GTEST_INCLUDE_GTEST_INTERNAL_GTEST_TUPLE_H_
     37 #define GTEST_INCLUDE_GTEST_INTERNAL_GTEST_TUPLE_H_
     38 
     39 #include <utility>  // For ::std::pair.
     40 
     41 // The compiler used in Symbian has a bug that prevents us from declaring the
     42 // tuple template as a friend (it complains that tuple is redefined).  This
     43 // hack bypasses the bug by declaring the members that should otherwise be
     44 // private as public.
     45 #if defined(__SYMBIAN32__)
     46 #define GTEST_DECLARE_TUPLE_AS_FRIEND_ public:
     47 #else
     48 #define GTEST_DECLARE_TUPLE_AS_FRIEND_ \
     49     template <GTEST_10_TYPENAMES_(U)> friend class tuple; \
     50    private:
     51 #endif
     52 
     53 // GTEST_n_TUPLE_(T) is the type of an n-tuple.
     54 #define GTEST_0_TUPLE_(T) tuple<>
     55 #define GTEST_1_TUPLE_(T) tuple<T##0, void, void, void, void, void, void, \
     56     void, void, void>
     57 #define GTEST_2_TUPLE_(T) tuple<T##0, T##1, void, void, void, void, void, \
     58     void, void, void>
     59 #define GTEST_3_TUPLE_(T) tuple<T##0, T##1, T##2, void, void, void, void, \
     60     void, void, void>
     61 #define GTEST_4_TUPLE_(T) tuple<T##0, T##1, T##2, T##3, void, void, void, \
     62     void, void, void>
     63 #define GTEST_5_TUPLE_(T) tuple<T##0, T##1, T##2, T##3, T##4, void, void, \
     64     void, void, void>
     65 #define GTEST_6_TUPLE_(T) tuple<T##0, T##1, T##2, T##3, T##4, T##5, void, \
     66     void, void, void>
     67 #define GTEST_7_TUPLE_(T) tuple<T##0, T##1, T##2, T##3, T##4, T##5, T##6, \
     68     void, void, void>
     69 #define GTEST_8_TUPLE_(T) tuple<T##0, T##1, T##2, T##3, T##4, T##5, T##6, \
     70     T##7, void, void>
     71 #define GTEST_9_TUPLE_(T) tuple<T##0, T##1, T##2, T##3, T##4, T##5, T##6, \
     72     T##7, T##8, void>
     73 #define GTEST_10_TUPLE_(T) tuple<T##0, T##1, T##2, T##3, T##4, T##5, T##6, \
     74     T##7, T##8, T##9>
     75 
     76 // GTEST_n_TYPENAMES_(T) declares a list of n typenames.
     77 #define GTEST_0_TYPENAMES_(T)
     78 #define GTEST_1_TYPENAMES_(T) typename T##0
     79 #define GTEST_2_TYPENAMES_(T) typename T##0, typename T##1
     80 #define GTEST_3_TYPENAMES_(T) typename T##0, typename T##1, typename T##2
     81 #define GTEST_4_TYPENAMES_(T) typename T##0, typename T##1, typename T##2, \
     82     typename T##3
     83 #define GTEST_5_TYPENAMES_(T) typename T##0, typename T##1, typename T##2, \
     84     typename T##3, typename T##4
     85 #define GTEST_6_TYPENAMES_(T) typename T##0, typename T##1, typename T##2, \
     86     typename T##3, typename T##4, typename T##5
     87 #define GTEST_7_TYPENAMES_(T) typename T##0, typename T##1, typename T##2, \
     88     typename T##3, typename T##4, typename T##5, typename T##6
     89 #define GTEST_8_TYPENAMES_(T) typename T##0, typename T##1, typename T##2, \
     90     typename T##3, typename T##4, typename T##5, typename T##6, typename T##7
     91 #define GTEST_9_TYPENAMES_(T) typename T##0, typename T##1, typename T##2, \
     92     typename T##3, typename T##4, typename T##5, typename T##6, \
     93     typename T##7, typename T##8
     94 #define GTEST_10_TYPENAMES_(T) typename T##0, typename T##1, typename T##2, \
     95     typename T##3, typename T##4, typename T##5, typename T##6, \
     96     typename T##7, typename T##8, typename T##9
     97 
     98 // In theory, defining stuff in the ::std namespace is undefined
     99 // behavior.  We can do this as we are playing the role of a standard
    100 // library vendor.
    101 namespace std {
    102 namespace tr1 {
    103 
    104 template <typename T0 = void, typename T1 = void, typename T2 = void,
    105     typename T3 = void, typename T4 = void, typename T5 = void,
    106     typename T6 = void, typename T7 = void, typename T8 = void,
    107     typename T9 = void>
    108 class tuple;
    109 
    110 // Anything in namespace gtest_internal is Google Test's INTERNAL
    111 // IMPLEMENTATION DETAIL and MUST NOT BE USED DIRECTLY in user code.
    112 namespace gtest_internal {
    113 
    114 // ByRef<T>::type is T if T is a reference; otherwise it's const T&.
    115 template <typename T>
    116 struct ByRef { typedef const T& type; };  // NOLINT
    117 template <typename T>
    118 struct ByRef<T&> { typedef T& type; };  // NOLINT
    119 
    120 // A handy wrapper for ByRef.
    121 #define GTEST_BY_REF_(T) typename ::std::tr1::gtest_internal::ByRef<T>::type
    122 
    123 // AddRef<T>::type is T if T is a reference; otherwise it's T&.  This
    124 // is the same as tr1::add_reference<T>::type.
    125 template <typename T>
    126 struct AddRef { typedef T& type; };  // NOLINT
    127 template <typename T>
    128 struct AddRef<T&> { typedef T& type; };  // NOLINT
    129 
    130 // A handy wrapper for AddRef.
    131 #define GTEST_ADD_REF_(T) typename ::std::tr1::gtest_internal::AddRef<T>::type
    132 
    133 // A helper for implementing get<k>().
    134 template <int k> class Get;
    135 
    136 // A helper for implementing tuple_element<k, T>.  kIndexValid is true
    137 // iff k < the number of fields in tuple type T.
    138 template <bool kIndexValid, int kIndex, class Tuple>
    139 struct TupleElement;
    140 
    141 template <GTEST_10_TYPENAMES_(T)>
    142 struct TupleElement<true, 0, GTEST_10_TUPLE_(T)> { typedef T0 type; };
    143 
    144 template <GTEST_10_TYPENAMES_(T)>
    145 struct TupleElement<true, 1, GTEST_10_TUPLE_(T)> { typedef T1 type; };
    146 
    147 template <GTEST_10_TYPENAMES_(T)>
    148 struct TupleElement<true, 2, GTEST_10_TUPLE_(T)> { typedef T2 type; };
    149 
    150 template <GTEST_10_TYPENAMES_(T)>
    151 struct TupleElement<true, 3, GTEST_10_TUPLE_(T)> { typedef T3 type; };
    152 
    153 template <GTEST_10_TYPENAMES_(T)>
    154 struct TupleElement<true, 4, GTEST_10_TUPLE_(T)> { typedef T4 type; };
    155 
    156 template <GTEST_10_TYPENAMES_(T)>
    157 struct TupleElement<true, 5, GTEST_10_TUPLE_(T)> { typedef T5 type; };
    158 
    159 template <GTEST_10_TYPENAMES_(T)>
    160 struct TupleElement<true, 6, GTEST_10_TUPLE_(T)> { typedef T6 type; };
    161 
    162 template <GTEST_10_TYPENAMES_(T)>
    163 struct TupleElement<true, 7, GTEST_10_TUPLE_(T)> { typedef T7 type; };
    164 
    165 template <GTEST_10_TYPENAMES_(T)>
    166 struct TupleElement<true, 8, GTEST_10_TUPLE_(T)> { typedef T8 type; };
    167 
    168 template <GTEST_10_TYPENAMES_(T)>
    169 struct TupleElement<true, 9, GTEST_10_TUPLE_(T)> { typedef T9 type; };
    170 
    171 }  // namespace gtest_internal
    172 
    173 template <>
    174 class tuple<> {
    175  public:
    176   tuple() {}
    177   tuple(const tuple& /* t */)  {}
    178   tuple& operator=(const tuple& /* t */) { return *this; }
    179 };
    180 
    181 template <GTEST_1_TYPENAMES_(T)>
    182 class GTEST_1_TUPLE_(T) {
    183  public:
    184   template <int k> friend class gtest_internal::Get;
    185 
    186   tuple() {}
    187 
    188   explicit tuple(GTEST_BY_REF_(T0) f0) : f0_(f0) {}
    189 
    190   tuple(const tuple& t) : f0_(t.f0_) {}
    191 
    192   template <GTEST_1_TYPENAMES_(U)>
    193   tuple(const GTEST_1_TUPLE_(U)& t) : f0_(t.f0_) {}
    194 
    195   tuple& operator=(const tuple& t) { return CopyFrom(t); }
    196 
    197   template <GTEST_1_TYPENAMES_(U)>
    198   tuple& operator=(const GTEST_1_TUPLE_(U)& t) {
    199     return CopyFrom(t);
    200   }
    201 
    202   GTEST_DECLARE_TUPLE_AS_FRIEND_
    203 
    204   template <GTEST_1_TYPENAMES_(U)>
    205   tuple& CopyFrom(const GTEST_1_TUPLE_(U)& t) {
    206     f0_ = t.f0_;
    207     return *this;
    208   }
    209 
    210   T0 f0_;
    211 };
    212 
    213 template <GTEST_2_TYPENAMES_(T)>
    214 class GTEST_2_TUPLE_(T) {
    215  public:
    216   template <int k> friend class gtest_internal::Get;
    217 
    218   tuple() {}
    219 
    220   explicit tuple(GTEST_BY_REF_(T0) f0, GTEST_BY_REF_(T1) f1) : f0_(f0),
    221       f1_(f1) {}
    222 
    223   tuple(const tuple& t) : f0_(t.f0_), f1_(t.f1_) {}
    224 
    225   template <GTEST_2_TYPENAMES_(U)>
    226   tuple(const GTEST_2_TUPLE_(U)& t) : f0_(t.f0_), f1_(t.f1_) {}
    227   template <typename U0, typename U1>
    228   tuple(const ::std::pair<U0, U1>& p) : f0_(p.first), f1_(p.second) {}
    229 
    230   tuple& operator=(const tuple& t) { return CopyFrom(t); }
    231 
    232   template <GTEST_2_TYPENAMES_(U)>
    233   tuple& operator=(const GTEST_2_TUPLE_(U)& t) {
    234     return CopyFrom(t);
    235   }
    236   template <typename U0, typename U1>
    237   tuple& operator=(const ::std::pair<U0, U1>& p) {
    238     f0_ = p.first;
    239     f1_ = p.second;
    240     return *this;
    241   }
    242 
    243   GTEST_DECLARE_TUPLE_AS_FRIEND_
    244 
    245   template <GTEST_2_TYPENAMES_(U)>
    246   tuple& CopyFrom(const GTEST_2_TUPLE_(U)& t) {
    247     f0_ = t.f0_;
    248     f1_ = t.f1_;
    249     return *this;
    250   }
    251 
    252   T0 f0_;
    253   T1 f1_;
    254 };
    255 
    256 template <GTEST_3_TYPENAMES_(T)>
    257 class GTEST_3_TUPLE_(T) {
    258  public:
    259   template <int k> friend class gtest_internal::Get;
    260 
    261   tuple() {}
    262 
    263   explicit tuple(GTEST_BY_REF_(T0) f0, GTEST_BY_REF_(T1) f1,
    264       GTEST_BY_REF_(T2) f2) : f0_(f0), f1_(f1), f2_(f2) {}
    265 
    266   tuple(const tuple& t) : f0_(t.f0_), f1_(t.f1_), f2_(t.f2_) {}
    267 
    268   template <GTEST_3_TYPENAMES_(U)>
    269   tuple(const GTEST_3_TUPLE_(U)& t) : f0_(t.f0_), f1_(t.f1_), f2_(t.f2_) {}
    270 
    271   tuple& operator=(const tuple& t) { return CopyFrom(t); }
    272 
    273   template <GTEST_3_TYPENAMES_(U)>
    274   tuple& operator=(const GTEST_3_TUPLE_(U)& t) {
    275     return CopyFrom(t);
    276   }
    277 
    278   GTEST_DECLARE_TUPLE_AS_FRIEND_
    279 
    280   template <GTEST_3_TYPENAMES_(U)>
    281   tuple& CopyFrom(const GTEST_3_TUPLE_(U)& t) {
    282     f0_ = t.f0_;
    283     f1_ = t.f1_;
    284     f2_ = t.f2_;
    285     return *this;
    286   }
    287 
    288   T0 f0_;
    289   T1 f1_;
    290   T2 f2_;
    291 };
    292 
    293 template <GTEST_4_TYPENAMES_(T)>
    294 class GTEST_4_TUPLE_(T) {
    295  public:
    296   template <int k> friend class gtest_internal::Get;
    297 
    298   tuple() {}
    299 
    300   explicit tuple(GTEST_BY_REF_(T0) f0, GTEST_BY_REF_(T1) f1,
    301       GTEST_BY_REF_(T2) f2, GTEST_BY_REF_(T3) f3) : f0_(f0), f1_(f1), f2_(f2),
    302       f3_(f3) {}
    303 
    304   tuple(const tuple& t) : f0_(t.f0_), f1_(t.f1_), f2_(t.f2_), f3_(t.f3_) {}
    305 
    306   template <GTEST_4_TYPENAMES_(U)>
    307   tuple(const GTEST_4_TUPLE_(U)& t) : f0_(t.f0_), f1_(t.f1_), f2_(t.f2_),
    308       f3_(t.f3_) {}
    309 
    310   tuple& operator=(const tuple& t) { return CopyFrom(t); }
    311 
    312   template <GTEST_4_TYPENAMES_(U)>
    313   tuple& operator=(const GTEST_4_TUPLE_(U)& t) {
    314     return CopyFrom(t);
    315   }
    316 
    317   GTEST_DECLARE_TUPLE_AS_FRIEND_
    318 
    319   template <GTEST_4_TYPENAMES_(U)>
    320   tuple& CopyFrom(const GTEST_4_TUPLE_(U)& t) {
    321     f0_ = t.f0_;
    322     f1_ = t.f1_;
    323     f2_ = t.f2_;
    324     f3_ = t.f3_;
    325     return *this;
    326   }
    327 
    328   T0 f0_;
    329   T1 f1_;
    330   T2 f2_;
    331   T3 f3_;
    332 };
    333 
    334 template <GTEST_5_TYPENAMES_(T)>
    335 class GTEST_5_TUPLE_(T) {
    336  public:
    337   template <int k> friend class gtest_internal::Get;
    338 
    339   tuple() {}
    340 
    341   explicit tuple(GTEST_BY_REF_(T0) f0, GTEST_BY_REF_(T1) f1,
    342       GTEST_BY_REF_(T2) f2, GTEST_BY_REF_(T3) f3,
    343       GTEST_BY_REF_(T4) f4) : f0_(f0), f1_(f1), f2_(f2), f3_(f3), f4_(f4) {}
    344 
    345   tuple(const tuple& t) : f0_(t.f0_), f1_(t.f1_), f2_(t.f2_), f3_(t.f3_),
    346       f4_(t.f4_) {}
    347 
    348   template <GTEST_5_TYPENAMES_(U)>
    349   tuple(const GTEST_5_TUPLE_(U)& t) : f0_(t.f0_), f1_(t.f1_), f2_(t.f2_),
    350       f3_(t.f3_), f4_(t.f4_) {}
    351 
    352   tuple& operator=(const tuple& t) { return CopyFrom(t); }
    353 
    354   template <GTEST_5_TYPENAMES_(U)>
    355   tuple& operator=(const GTEST_5_TUPLE_(U)& t) {
    356     return CopyFrom(t);
    357   }
    358 
    359   GTEST_DECLARE_TUPLE_AS_FRIEND_
    360 
    361   template <GTEST_5_TYPENAMES_(U)>
    362   tuple& CopyFrom(const GTEST_5_TUPLE_(U)& t) {
    363     f0_ = t.f0_;
    364     f1_ = t.f1_;
    365     f2_ = t.f2_;
    366     f3_ = t.f3_;
    367     f4_ = t.f4_;
    368     return *this;
    369   }
    370 
    371   T0 f0_;
    372   T1 f1_;
    373   T2 f2_;
    374   T3 f3_;
    375   T4 f4_;
    376 };
    377 
    378 template <GTEST_6_TYPENAMES_(T)>
    379 class GTEST_6_TUPLE_(T) {
    380  public:
    381   template <int k> friend class gtest_internal::Get;
    382 
    383   tuple() {}
    384 
    385   explicit tuple(GTEST_BY_REF_(T0) f0, GTEST_BY_REF_(T1) f1,
    386       GTEST_BY_REF_(T2) f2, GTEST_BY_REF_(T3) f3, GTEST_BY_REF_(T4) f4,
    387       GTEST_BY_REF_(T5) f5) : f0_(f0), f1_(f1), f2_(f2), f3_(f3), f4_(f4),
    388       f5_(f5) {}
    389 
    390   tuple(const tuple& t) : f0_(t.f0_), f1_(t.f1_), f2_(t.f2_), f3_(t.f3_),
    391       f4_(t.f4_), f5_(t.f5_) {}
    392 
    393   template <GTEST_6_TYPENAMES_(U)>
    394   tuple(const GTEST_6_TUPLE_(U)& t) : f0_(t.f0_), f1_(t.f1_), f2_(t.f2_),
    395       f3_(t.f3_), f4_(t.f4_), f5_(t.f5_) {}
    396 
    397   tuple& operator=(const tuple& t) { return CopyFrom(t); }
    398 
    399   template <GTEST_6_TYPENAMES_(U)>
    400   tuple& operator=(const GTEST_6_TUPLE_(U)& t) {
    401     return CopyFrom(t);
    402   }
    403 
    404   GTEST_DECLARE_TUPLE_AS_FRIEND_
    405 
    406   template <GTEST_6_TYPENAMES_(U)>
    407   tuple& CopyFrom(const GTEST_6_TUPLE_(U)& t) {
    408     f0_ = t.f0_;
    409     f1_ = t.f1_;
    410     f2_ = t.f2_;
    411     f3_ = t.f3_;
    412     f4_ = t.f4_;
    413     f5_ = t.f5_;
    414     return *this;
    415   }
    416 
    417   T0 f0_;
    418   T1 f1_;
    419   T2 f2_;
    420   T3 f3_;
    421   T4 f4_;
    422   T5 f5_;
    423 };
    424 
    425 template <GTEST_7_TYPENAMES_(T)>
    426 class GTEST_7_TUPLE_(T) {
    427  public:
    428   template <int k> friend class gtest_internal::Get;
    429 
    430   tuple() {}
    431 
    432   explicit tuple(GTEST_BY_REF_(T0) f0, GTEST_BY_REF_(T1) f1,
    433       GTEST_BY_REF_(T2) f2, GTEST_BY_REF_(T3) f3, GTEST_BY_REF_(T4) f4,
    434       GTEST_BY_REF_(T5) f5, GTEST_BY_REF_(T6) f6) : f0_(f0), f1_(f1), f2_(f2),
    435       f3_(f3), f4_(f4), f5_(f5), f6_(f6) {}
    436 
    437   tuple(const tuple& t) : f0_(t.f0_), f1_(t.f1_), f2_(t.f2_), f3_(t.f3_),
    438       f4_(t.f4_), f5_(t.f5_), f6_(t.f6_) {}
    439 
    440   template <GTEST_7_TYPENAMES_(U)>
    441   tuple(const GTEST_7_TUPLE_(U)& t) : f0_(t.f0_), f1_(t.f1_), f2_(t.f2_),
    442       f3_(t.f3_), f4_(t.f4_), f5_(t.f5_), f6_(t.f6_) {}
    443 
    444   tuple& operator=(const tuple& t) { return CopyFrom(t); }
    445 
    446   template <GTEST_7_TYPENAMES_(U)>
    447   tuple& operator=(const GTEST_7_TUPLE_(U)& t) {
    448     return CopyFrom(t);
    449   }
    450 
    451   GTEST_DECLARE_TUPLE_AS_FRIEND_
    452 
    453   template <GTEST_7_TYPENAMES_(U)>
    454   tuple& CopyFrom(const GTEST_7_TUPLE_(U)& t) {
    455     f0_ = t.f0_;
    456     f1_ = t.f1_;
    457     f2_ = t.f2_;
    458     f3_ = t.f3_;
    459     f4_ = t.f4_;
    460     f5_ = t.f5_;
    461     f6_ = t.f6_;
    462     return *this;
    463   }
    464 
    465   T0 f0_;
    466   T1 f1_;
    467   T2 f2_;
    468   T3 f3_;
    469   T4 f4_;
    470   T5 f5_;
    471   T6 f6_;
    472 };
    473 
    474 template <GTEST_8_TYPENAMES_(T)>
    475 class GTEST_8_TUPLE_(T) {
    476  public:
    477   template <int k> friend class gtest_internal::Get;
    478 
    479   tuple() {}
    480 
    481   explicit tuple(GTEST_BY_REF_(T0) f0, GTEST_BY_REF_(T1) f1,
    482       GTEST_BY_REF_(T2) f2, GTEST_BY_REF_(T3) f3, GTEST_BY_REF_(T4) f4,
    483       GTEST_BY_REF_(T5) f5, GTEST_BY_REF_(T6) f6,
    484       GTEST_BY_REF_(T7) f7) : f0_(f0), f1_(f1), f2_(f2), f3_(f3), f4_(f4),
    485       f5_(f5), f6_(f6), f7_(f7) {}
    486 
    487   tuple(const tuple& t) : f0_(t.f0_), f1_(t.f1_), f2_(t.f2_), f3_(t.f3_),
    488       f4_(t.f4_), f5_(t.f5_), f6_(t.f6_), f7_(t.f7_) {}
    489 
    490   template <GTEST_8_TYPENAMES_(U)>
    491   tuple(const GTEST_8_TUPLE_(U)& t) : f0_(t.f0_), f1_(t.f1_), f2_(t.f2_),
    492       f3_(t.f3_), f4_(t.f4_), f5_(t.f5_), f6_(t.f6_), f7_(t.f7_) {}
    493 
    494   tuple& operator=(const tuple& t) { return CopyFrom(t); }
    495 
    496   template <GTEST_8_TYPENAMES_(U)>
    497   tuple& operator=(const GTEST_8_TUPLE_(U)& t) {
    498     return CopyFrom(t);
    499   }
    500 
    501   GTEST_DECLARE_TUPLE_AS_FRIEND_
    502 
    503   template <GTEST_8_TYPENAMES_(U)>
    504   tuple& CopyFrom(const GTEST_8_TUPLE_(U)& t) {
    505     f0_ = t.f0_;
    506     f1_ = t.f1_;
    507     f2_ = t.f2_;
    508     f3_ = t.f3_;
    509     f4_ = t.f4_;
    510     f5_ = t.f5_;
    511     f6_ = t.f6_;
    512     f7_ = t.f7_;
    513     return *this;
    514   }
    515 
    516   T0 f0_;
    517   T1 f1_;
    518   T2 f2_;
    519   T3 f3_;
    520   T4 f4_;
    521   T5 f5_;
    522   T6 f6_;
    523   T7 f7_;
    524 };
    525 
    526 template <GTEST_9_TYPENAMES_(T)>
    527 class GTEST_9_TUPLE_(T) {
    528  public:
    529   template <int k> friend class gtest_internal::Get;
    530 
    531   tuple() {}
    532 
    533   explicit tuple(GTEST_BY_REF_(T0) f0, GTEST_BY_REF_(T1) f1,
    534       GTEST_BY_REF_(T2) f2, GTEST_BY_REF_(T3) f3, GTEST_BY_REF_(T4) f4,
    535       GTEST_BY_REF_(T5) f5, GTEST_BY_REF_(T6) f6, GTEST_BY_REF_(T7) f7,
    536       GTEST_BY_REF_(T8) f8) : f0_(f0), f1_(f1), f2_(f2), f3_(f3), f4_(f4),
    537       f5_(f5), f6_(f6), f7_(f7), f8_(f8) {}
    538 
    539   tuple(const tuple& t) : f0_(t.f0_), f1_(t.f1_), f2_(t.f2_), f3_(t.f3_),
    540       f4_(t.f4_), f5_(t.f5_), f6_(t.f6_), f7_(t.f7_), f8_(t.f8_) {}
    541 
    542   template <GTEST_9_TYPENAMES_(U)>
    543   tuple(const GTEST_9_TUPLE_(U)& t) : f0_(t.f0_), f1_(t.f1_), f2_(t.f2_),
    544       f3_(t.f3_), f4_(t.f4_), f5_(t.f5_), f6_(t.f6_), f7_(t.f7_), f8_(t.f8_) {}
    545 
    546   tuple& operator=(const tuple& t) { return CopyFrom(t); }
    547 
    548   template <GTEST_9_TYPENAMES_(U)>
    549   tuple& operator=(const GTEST_9_TUPLE_(U)& t) {
    550     return CopyFrom(t);
    551   }
    552 
    553   GTEST_DECLARE_TUPLE_AS_FRIEND_
    554 
    555   template <GTEST_9_TYPENAMES_(U)>
    556   tuple& CopyFrom(const GTEST_9_TUPLE_(U)& t) {
    557     f0_ = t.f0_;
    558     f1_ = t.f1_;
    559     f2_ = t.f2_;
    560     f3_ = t.f3_;
    561     f4_ = t.f4_;
    562     f5_ = t.f5_;
    563     f6_ = t.f6_;
    564     f7_ = t.f7_;
    565     f8_ = t.f8_;
    566     return *this;
    567   }
    568 
    569   T0 f0_;
    570   T1 f1_;
    571   T2 f2_;
    572   T3 f3_;
    573   T4 f4_;
    574   T5 f5_;
    575   T6 f6_;
    576   T7 f7_;
    577   T8 f8_;
    578 };
    579 
    580 template <GTEST_10_TYPENAMES_(T)>
    581 class tuple {
    582  public:
    583   template <int k> friend class gtest_internal::Get;
    584 
    585   tuple() {}
    586 
    587   explicit tuple(GTEST_BY_REF_(T0) f0, GTEST_BY_REF_(T1) f1,
    588       GTEST_BY_REF_(T2) f2, GTEST_BY_REF_(T3) f3, GTEST_BY_REF_(T4) f4,
    589       GTEST_BY_REF_(T5) f5, GTEST_BY_REF_(T6) f6, GTEST_BY_REF_(T7) f7,
    590       GTEST_BY_REF_(T8) f8, GTEST_BY_REF_(T9) f9) : f0_(f0), f1_(f1), f2_(f2),
    591       f3_(f3), f4_(f4), f5_(f5), f6_(f6), f7_(f7), f8_(f8), f9_(f9) {}
    592 
    593   tuple(const tuple& t) : f0_(t.f0_), f1_(t.f1_), f2_(t.f2_), f3_(t.f3_),
    594       f4_(t.f4_), f5_(t.f5_), f6_(t.f6_), f7_(t.f7_), f8_(t.f8_), f9_(t.f9_) {}
    595 
    596   template <GTEST_10_TYPENAMES_(U)>
    597   tuple(const GTEST_10_TUPLE_(U)& t) : f0_(t.f0_), f1_(t.f1_), f2_(t.f2_),
    598       f3_(t.f3_), f4_(t.f4_), f5_(t.f5_), f6_(t.f6_), f7_(t.f7_), f8_(t.f8_),
    599       f9_(t.f9_) {}
    600 
    601   tuple& operator=(const tuple& t) { return CopyFrom(t); }
    602 
    603   template <GTEST_10_TYPENAMES_(U)>
    604   tuple& operator=(const GTEST_10_TUPLE_(U)& t) {
    605     return CopyFrom(t);
    606   }
    607 
    608   GTEST_DECLARE_TUPLE_AS_FRIEND_
    609 
    610   template <GTEST_10_TYPENAMES_(U)>
    611   tuple& CopyFrom(const GTEST_10_TUPLE_(U)& t) {
    612     f0_ = t.f0_;
    613     f1_ = t.f1_;
    614     f2_ = t.f2_;
    615     f3_ = t.f3_;
    616     f4_ = t.f4_;
    617     f5_ = t.f5_;
    618     f6_ = t.f6_;
    619     f7_ = t.f7_;
    620     f8_ = t.f8_;
    621     f9_ = t.f9_;
    622     return *this;
    623   }
    624 
    625   T0 f0_;
    626   T1 f1_;
    627   T2 f2_;
    628   T3 f3_;
    629   T4 f4_;
    630   T5 f5_;
    631   T6 f6_;
    632   T7 f7_;
    633   T8 f8_;
    634   T9 f9_;
    635 };
    636 
    637 // 6.1.3.2 Tuple creation functions.
    638 
    639 // Known limitations: we don't support passing an
    640 // std::tr1::reference_wrapper<T> to make_tuple().  And we don't
    641 // implement tie().
    642 
    643 inline tuple<> make_tuple() { return tuple<>(); }
    644 
    645 template <GTEST_1_TYPENAMES_(T)>
    646 inline GTEST_1_TUPLE_(T) make_tuple(const T0& f0) {
    647   return GTEST_1_TUPLE_(T)(f0);
    648 }
    649 
    650 template <GTEST_2_TYPENAMES_(T)>
    651 inline GTEST_2_TUPLE_(T) make_tuple(const T0& f0, const T1& f1) {
    652   return GTEST_2_TUPLE_(T)(f0, f1);
    653 }
    654 
    655 template <GTEST_3_TYPENAMES_(T)>
    656 inline GTEST_3_TUPLE_(T) make_tuple(const T0& f0, const T1& f1, const T2& f2) {
    657   return GTEST_3_TUPLE_(T)(f0, f1, f2);
    658 }
    659 
    660 template <GTEST_4_TYPENAMES_(T)>
    661 inline GTEST_4_TUPLE_(T) make_tuple(const T0& f0, const T1& f1, const T2& f2,
    662     const T3& f3) {
    663   return GTEST_4_TUPLE_(T)(f0, f1, f2, f3);
    664 }
    665 
    666 template <GTEST_5_TYPENAMES_(T)>
    667 inline GTEST_5_TUPLE_(T) make_tuple(const T0& f0, const T1& f1, const T2& f2,
    668     const T3& f3, const T4& f4) {
    669   return GTEST_5_TUPLE_(T)(f0, f1, f2, f3, f4);
    670 }
    671 
    672 template <GTEST_6_TYPENAMES_(T)>
    673 inline GTEST_6_TUPLE_(T) make_tuple(const T0& f0, const T1& f1, const T2& f2,
    674     const T3& f3, const T4& f4, const T5& f5) {
    675   return GTEST_6_TUPLE_(T)(f0, f1, f2, f3, f4, f5);
    676 }
    677 
    678 template <GTEST_7_TYPENAMES_(T)>
    679 inline GTEST_7_TUPLE_(T) make_tuple(const T0& f0, const T1& f1, const T2& f2,
    680     const T3& f3, const T4& f4, const T5& f5, const T6& f6) {
    681   return GTEST_7_TUPLE_(T)(f0, f1, f2, f3, f4, f5, f6);
    682 }
    683 
    684 template <GTEST_8_TYPENAMES_(T)>
    685 inline GTEST_8_TUPLE_(T) make_tuple(const T0& f0, const T1& f1, const T2& f2,
    686     const T3& f3, const T4& f4, const T5& f5, const T6& f6, const T7& f7) {
    687   return GTEST_8_TUPLE_(T)(f0, f1, f2, f3, f4, f5, f6, f7);
    688 }
    689 
    690 template <GTEST_9_TYPENAMES_(T)>
    691 inline GTEST_9_TUPLE_(T) make_tuple(const T0& f0, const T1& f1, const T2& f2,
    692     const T3& f3, const T4& f4, const T5& f5, const T6& f6, const T7& f7,
    693     const T8& f8) {
    694   return GTEST_9_TUPLE_(T)(f0, f1, f2, f3, f4, f5, f6, f7, f8);
    695 }
    696 
    697 template <GTEST_10_TYPENAMES_(T)>
    698 inline GTEST_10_TUPLE_(T) make_tuple(const T0& f0, const T1& f1, const T2& f2,
    699     const T3& f3, const T4& f4, const T5& f5, const T6& f6, const T7& f7,
    700     const T8& f8, const T9& f9) {
    701   return GTEST_10_TUPLE_(T)(f0, f1, f2, f3, f4, f5, f6, f7, f8, f9);
    702 }
    703 
    704 // 6.1.3.3 Tuple helper classes.
    705 
    706 template <typename Tuple> struct tuple_size;
    707 
    708 template <GTEST_0_TYPENAMES_(T)>
    709 struct tuple_size<GTEST_0_TUPLE_(T)> { static const int value = 0; };
    710 
    711 template <GTEST_1_TYPENAMES_(T)>
    712 struct tuple_size<GTEST_1_TUPLE_(T)> { static const int value = 1; };
    713 
    714 template <GTEST_2_TYPENAMES_(T)>
    715 struct tuple_size<GTEST_2_TUPLE_(T)> { static const int value = 2; };
    716 
    717 template <GTEST_3_TYPENAMES_(T)>
    718 struct tuple_size<GTEST_3_TUPLE_(T)> { static const int value = 3; };
    719 
    720 template <GTEST_4_TYPENAMES_(T)>
    721 struct tuple_size<GTEST_4_TUPLE_(T)> { static const int value = 4; };
    722 
    723 template <GTEST_5_TYPENAMES_(T)>
    724 struct tuple_size<GTEST_5_TUPLE_(T)> { static const int value = 5; };
    725 
    726 template <GTEST_6_TYPENAMES_(T)>
    727 struct tuple_size<GTEST_6_TUPLE_(T)> { static const int value = 6; };
    728 
    729 template <GTEST_7_TYPENAMES_(T)>
    730 struct tuple_size<GTEST_7_TUPLE_(T)> { static const int value = 7; };
    731 
    732 template <GTEST_8_TYPENAMES_(T)>
    733 struct tuple_size<GTEST_8_TUPLE_(T)> { static const int value = 8; };
    734 
    735 template <GTEST_9_TYPENAMES_(T)>
    736 struct tuple_size<GTEST_9_TUPLE_(T)> { static const int value = 9; };
    737 
    738 template <GTEST_10_TYPENAMES_(T)>
    739 struct tuple_size<GTEST_10_TUPLE_(T)> { static const int value = 10; };
    740 
    741 template <int k, class Tuple>
    742 struct tuple_element {
    743   typedef typename gtest_internal::TupleElement<
    744       k < (tuple_size<Tuple>::value), k, Tuple>::type type;
    745 };
    746 
    747 #define GTEST_TUPLE_ELEMENT_(k, Tuple) typename tuple_element<k, Tuple >::type
    748 
    749 // 6.1.3.4 Element access.
    750 
    751 namespace gtest_internal {
    752 
    753 template <>
    754 class Get<0> {
    755  public:
    756   template <class Tuple>
    757   static GTEST_ADD_REF_(GTEST_TUPLE_ELEMENT_(0, Tuple))
    758   Field(Tuple& t) { return t.f0_; }  // NOLINT
    759 
    760   template <class Tuple>
    761   static GTEST_BY_REF_(GTEST_TUPLE_ELEMENT_(0, Tuple))
    762   ConstField(const Tuple& t) { return t.f0_; }
    763 };
    764 
    765 template <>
    766 class Get<1> {
    767  public:
    768   template <class Tuple>
    769   static GTEST_ADD_REF_(GTEST_TUPLE_ELEMENT_(1, Tuple))
    770   Field(Tuple& t) { return t.f1_; }  // NOLINT
    771 
    772   template <class Tuple>
    773   static GTEST_BY_REF_(GTEST_TUPLE_ELEMENT_(1, Tuple))
    774   ConstField(const Tuple& t) { return t.f1_; }
    775 };
    776 
    777 template <>
    778 class Get<2> {
    779  public:
    780   template <class Tuple>
    781   static GTEST_ADD_REF_(GTEST_TUPLE_ELEMENT_(2, Tuple))
    782   Field(Tuple& t) { return t.f2_; }  // NOLINT
    783 
    784   template <class Tuple>
    785   static GTEST_BY_REF_(GTEST_TUPLE_ELEMENT_(2, Tuple))
    786   ConstField(const Tuple& t) { return t.f2_; }
    787 };
    788 
    789 template <>
    790 class Get<3> {
    791  public:
    792   template <class Tuple>
    793   static GTEST_ADD_REF_(GTEST_TUPLE_ELEMENT_(3, Tuple))
    794   Field(Tuple& t) { return t.f3_; }  // NOLINT
    795 
    796   template <class Tuple>
    797   static GTEST_BY_REF_(GTEST_TUPLE_ELEMENT_(3, Tuple))
    798   ConstField(const Tuple& t) { return t.f3_; }
    799 };
    800 
    801 template <>
    802 class Get<4> {
    803  public:
    804   template <class Tuple>
    805   static GTEST_ADD_REF_(GTEST_TUPLE_ELEMENT_(4, Tuple))
    806   Field(Tuple& t) { return t.f4_; }  // NOLINT
    807 
    808   template <class Tuple>
    809   static GTEST_BY_REF_(GTEST_TUPLE_ELEMENT_(4, Tuple))
    810   ConstField(const Tuple& t) { return t.f4_; }
    811 };
    812 
    813 template <>
    814 class Get<5> {
    815  public:
    816   template <class Tuple>
    817   static GTEST_ADD_REF_(GTEST_TUPLE_ELEMENT_(5, Tuple))
    818   Field(Tuple& t) { return t.f5_; }  // NOLINT
    819 
    820   template <class Tuple>
    821   static GTEST_BY_REF_(GTEST_TUPLE_ELEMENT_(5, Tuple))
    822   ConstField(const Tuple& t) { return t.f5_; }
    823 };
    824 
    825 template <>
    826 class Get<6> {
    827  public:
    828   template <class Tuple>
    829   static GTEST_ADD_REF_(GTEST_TUPLE_ELEMENT_(6, Tuple))
    830   Field(Tuple& t) { return t.f6_; }  // NOLINT
    831 
    832   template <class Tuple>
    833   static GTEST_BY_REF_(GTEST_TUPLE_ELEMENT_(6, Tuple))
    834   ConstField(const Tuple& t) { return t.f6_; }
    835 };
    836 
    837 template <>
    838 class Get<7> {
    839  public:
    840   template <class Tuple>
    841   static GTEST_ADD_REF_(GTEST_TUPLE_ELEMENT_(7, Tuple))
    842   Field(Tuple& t) { return t.f7_; }  // NOLINT
    843 
    844   template <class Tuple>
    845   static GTEST_BY_REF_(GTEST_TUPLE_ELEMENT_(7, Tuple))
    846   ConstField(const Tuple& t) { return t.f7_; }
    847 };
    848 
    849 template <>
    850 class Get<8> {
    851  public:
    852   template <class Tuple>
    853   static GTEST_ADD_REF_(GTEST_TUPLE_ELEMENT_(8, Tuple))
    854   Field(Tuple& t) { return t.f8_; }  // NOLINT
    855 
    856   template <class Tuple>
    857   static GTEST_BY_REF_(GTEST_TUPLE_ELEMENT_(8, Tuple))
    858   ConstField(const Tuple& t) { return t.f8_; }
    859 };
    860 
    861 template <>
    862 class Get<9> {
    863  public:
    864   template <class Tuple>
    865   static GTEST_ADD_REF_(GTEST_TUPLE_ELEMENT_(9, Tuple))
    866   Field(Tuple& t) { return t.f9_; }  // NOLINT
    867 
    868   template <class Tuple>
    869   static GTEST_BY_REF_(GTEST_TUPLE_ELEMENT_(9, Tuple))
    870   ConstField(const Tuple& t) { return t.f9_; }
    871 };
    872 
    873 }  // namespace gtest_internal
    874 
    875 template <int k, GTEST_10_TYPENAMES_(T)>
    876 GTEST_ADD_REF_(GTEST_TUPLE_ELEMENT_(k, GTEST_10_TUPLE_(T)))
    877 get(GTEST_10_TUPLE_(T)& t) {
    878   return gtest_internal::Get<k>::Field(t);
    879 }
    880 
    881 template <int k, GTEST_10_TYPENAMES_(T)>
    882 GTEST_BY_REF_(GTEST_TUPLE_ELEMENT_(k,  GTEST_10_TUPLE_(T)))
    883 get(const GTEST_10_TUPLE_(T)& t) {
    884   return gtest_internal::Get<k>::ConstField(t);
    885 }
    886 
    887 // 6.1.3.5 Relational operators
    888 
    889 // We only implement == and !=, as we don't have a need for the rest yet.
    890 
    891 namespace gtest_internal {
    892 
    893 // SameSizeTuplePrefixComparator<k, k>::Eq(t1, t2) returns true if the
    894 // first k fields of t1 equals the first k fields of t2.
    895 // SameSizeTuplePrefixComparator(k1, k2) would be a compiler error if
    896 // k1 != k2.
    897 template <int kSize1, int kSize2>
    898 struct SameSizeTuplePrefixComparator;
    899 
    900 template <>
    901 struct SameSizeTuplePrefixComparator<0, 0> {
    902   template <class Tuple1, class Tuple2>
    903   static bool Eq(const Tuple1& /* t1 */, const Tuple2& /* t2 */) {
    904     return true;
    905   }
    906 };
    907 
    908 template <int k>
    909 struct SameSizeTuplePrefixComparator<k, k> {
    910   template <class Tuple1, class Tuple2>
    911   static bool Eq(const Tuple1& t1, const Tuple2& t2) {
    912     return SameSizeTuplePrefixComparator<k - 1, k - 1>::Eq(t1, t2) &&
    913         ::std::tr1::get<k - 1>(t1) == ::std::tr1::get<k - 1>(t2);
    914   }
    915 };
    916 
    917 }  // namespace gtest_internal
    918 
    919 template <GTEST_10_TYPENAMES_(T), GTEST_10_TYPENAMES_(U)>
    920 inline bool operator==(const GTEST_10_TUPLE_(T)& t,
    921                        const GTEST_10_TUPLE_(U)& u) {
    922   return gtest_internal::SameSizeTuplePrefixComparator<
    923       tuple_size<GTEST_10_TUPLE_(T)>::value,
    924       tuple_size<GTEST_10_TUPLE_(U)>::value>::Eq(t, u);
    925 }
    926 
    927 template <GTEST_10_TYPENAMES_(T), GTEST_10_TYPENAMES_(U)>
    928 inline bool operator!=(const GTEST_10_TUPLE_(T)& t,
    929                        const GTEST_10_TUPLE_(U)& u) { return !(t == u); }
    930 
    931 // 6.1.4 Pairs.
    932 // Unimplemented.
    933 
    934 }  // namespace tr1
    935 }  // namespace std
    936 
    937 #undef GTEST_0_TUPLE_
    938 #undef GTEST_1_TUPLE_
    939 #undef GTEST_2_TUPLE_
    940 #undef GTEST_3_TUPLE_
    941 #undef GTEST_4_TUPLE_
    942 #undef GTEST_5_TUPLE_
    943 #undef GTEST_6_TUPLE_
    944 #undef GTEST_7_TUPLE_
    945 #undef GTEST_8_TUPLE_
    946 #undef GTEST_9_TUPLE_
    947 #undef GTEST_10_TUPLE_
    948 
    949 #undef GTEST_0_TYPENAMES_
    950 #undef GTEST_1_TYPENAMES_
    951 #undef GTEST_2_TYPENAMES_
    952 #undef GTEST_3_TYPENAMES_
    953 #undef GTEST_4_TYPENAMES_
    954 #undef GTEST_5_TYPENAMES_
    955 #undef GTEST_6_TYPENAMES_
    956 #undef GTEST_7_TYPENAMES_
    957 #undef GTEST_8_TYPENAMES_
    958 #undef GTEST_9_TYPENAMES_
    959 #undef GTEST_10_TYPENAMES_
    960 
    961 #undef GTEST_DECLARE_TUPLE_AS_FRIEND_
    962 #undef GTEST_BY_REF_
    963 #undef GTEST_ADD_REF_
    964 #undef GTEST_TUPLE_ELEMENT_
    965 
    966 #endif  // GTEST_INCLUDE_GTEST_INTERNAL_GTEST_TUPLE_H_
    967