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#ifndef THIRD_PARTY_GOOGLETEST_GOOGLEMOCK_INCLUDE_GMOCK_PP_H_
#define THIRD_PARTY_GOOGLETEST_GOOGLEMOCK_INCLUDE_GMOCK_PP_H_

#undef GMOCK_PP_INTERNAL_USE_MSVC
#if defined(__clang__)
#define GMOCK_PP_INTERNAL_USE_MSVC 0
#elif defined(_MSC_VER)
// TODO(iserna): Also verify tradional versus comformant preprocessor.
static_assert(
    _MSC_VER >= 1900,
    "MSVC version not supported. There is support for MSVC 14.0 and above.");
#define GMOCK_PP_INTERNAL_USE_MSVC 1
#else
#define GMOCK_PP_INTERNAL_USE_MSVC 0
#endif

// Expands and concatenates the arguments. Constructed macros reevaluate.
#define GMOCK_PP_CAT(_1, _2) GMOCK_PP_INTERNAL_CAT(_1, _2)

// Expands and stringifies the only argument.
#define GMOCK_PP_STRINGIZE(...) GMOCK_PP_INTERNAL_STRINGIZE(__VA_ARGS__)

// Returns empty. Given a variadic number of arguments.
#define GMOCK_PP_EMPTY(...)

// Returns a comma. Given a variadic number of arguments.
#define GMOCK_PP_COMMA(...) ,

// Returns the only argument.
#define GMOCK_PP_IDENTITY(_1) _1

// MSVC preprocessor collapses __VA_ARGS__ in a single argument, we use a
// CAT-like directive to force correct evaluation. Each macro has its own.
#if GMOCK_PP_INTERNAL_USE_MSVC

// Evaluates to the number of arguments after expansion.
//
//   #define PAIR x, y
//
//   GMOCK_PP_NARG() => 1
//   GMOCK_PP_NARG(x) => 1
//   GMOCK_PP_NARG(x, y) => 2
//   GMOCK_PP_NARG(PAIR) => 2
//
// Requires: the number of arguments after expansion is at most 15.
#define GMOCK_PP_NARG(...)                                                    \
  GMOCK_PP_INTERNAL_NARG_CAT(                                                 \
      GMOCK_PP_INTERNAL_INTERNAL_16TH(__VA_ARGS__, 15, 14, 13, 12, 11, 10, 9, \
                                      8, 7, 6, 5, 4, 3, 2, 1), )

// Returns 1 if the expansion of arguments has an unprotected comma. Otherwise
// returns 0. Requires no more than 15 unprotected commas.
#define GMOCK_PP_HAS_COMMA(...)                                               \
  GMOCK_PP_INTERNAL_HAS_COMMA_CAT(                                            \
      GMOCK_PP_INTERNAL_INTERNAL_16TH(__VA_ARGS__, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
                                      1, 1, 1, 1, 1, 0), )
// Returns the first argument.
#define GMOCK_PP_HEAD(...) \
  GMOCK_PP_INTERNAL_HEAD_CAT(GMOCK_PP_INTERNAL_HEAD(__VA_ARGS__), )

// Returns the tail. A variadic list of all arguments minus the first. Requires
// at least one argument.
#define GMOCK_PP_TAIL(...) \
  GMOCK_PP_INTERNAL_TAIL_CAT(GMOCK_PP_INTERNAL_TAIL(__VA_ARGS__), )

// Calls CAT(_Macro, NARG(__VA_ARGS__))(__VA_ARGS__)
#define GMOCK_PP_VARIADIC_CALL(_Macro, ...) \
  GMOCK_PP_INTERNAL_VARIADIC_CALL_CAT(      \
      GMOCK_PP_CAT(_Macro, GMOCK_PP_NARG(__VA_ARGS__))(__VA_ARGS__), )

#else  // GMOCK_PP_INTERNAL_USE_MSVC

#define GMOCK_PP_NARG(...)                                                   \
  GMOCK_PP_INTERNAL_INTERNAL_16TH(__VA_ARGS__, 15, 14, 13, 12, 11, 10, 9, 8, \
                                  7, 6, 5, 4, 3, 2, 1)
#define GMOCK_PP_HAS_COMMA(...)                                              \
  GMOCK_PP_INTERNAL_INTERNAL_16TH(__VA_ARGS__, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
                                  1, 1, 1, 1, 0)
#define GMOCK_PP_HEAD(...) GMOCK_PP_INTERNAL_HEAD(__VA_ARGS__)
#define GMOCK_PP_TAIL(...) GMOCK_PP_INTERNAL_TAIL(__VA_ARGS__)
#define GMOCK_PP_VARIADIC_CALL(_Macro, ...) \
  GMOCK_PP_CAT(_Macro, GMOCK_PP_NARG(__VA_ARGS__))(__VA_ARGS__)

#endif  // GMOCK_PP_INTERNAL_USE_MSVC

// If the arguments after expansion have no tokens, evaluates to `1`. Otherwise
// evaluates to `0`.
//
// Requires: * the number of arguments after expansion is at most 15.
//           * If the argument is a macro, it must be able to be called with one
//             argument.
//
// Implementation details:
//
// There is one case when it generates a compile error: if the argument is macro
// that cannot be called with one argument.
//
//   #define M(a, b)  // it doesn't matter what it expands to
//
//   // Expected: expands to `0`.
//   // Actual: compile error.
//   GMOCK_PP_IS_EMPTY(M)
//
// There are 4 cases tested:
//
// * __VA_ARGS__ possible expansion has no unparen'd commas. Expected 0.
// * __VA_ARGS__ possible expansion is not enclosed in parenthesis. Expected 0.
// * __VA_ARGS__ possible expansion is not a macro that ()-evaluates to a comma.
//   Expected 0
// * __VA_ARGS__ is empty, or has unparen'd commas, or is enclosed in
//   parenthesis, or is a macro that ()-evaluates to comma. Expected 1.
//
// We trigger detection on '0001', i.e. on empty.
#define GMOCK_PP_IS_EMPTY(...)                                               \
  GMOCK_PP_INTERNAL_IS_EMPTY(GMOCK_PP_HAS_COMMA(__VA_ARGS__),                \
                             GMOCK_PP_HAS_COMMA(GMOCK_PP_COMMA __VA_ARGS__), \
                             GMOCK_PP_HAS_COMMA(__VA_ARGS__()),              \
                             GMOCK_PP_HAS_COMMA(GMOCK_PP_COMMA __VA_ARGS__()))

// Evaluates to _Then if _Cond is 1 and _Else if _Cond is 0.
#define GMOCK_PP_IF(_Cond, _Then, _Else) \
  GMOCK_PP_CAT(GMOCK_PP_INTERNAL_IF_, _Cond)(_Then, _Else)

// Evaluates to the number of arguments after expansion. Identifies 'empty' as
// 0.
//
//   #define PAIR x, y
//
//   GMOCK_PP_NARG0() => 0
//   GMOCK_PP_NARG0(x) => 1
//   GMOCK_PP_NARG0(x, y) => 2
//   GMOCK_PP_NARG0(PAIR) => 2
//
// Requires: * the number of arguments after expansion is at most 15.
//           * If the argument is a macro, it must be able to be called with one
//             argument.
#define GMOCK_PP_NARG0(...) \
  GMOCK_PP_IF(GMOCK_PP_IS_EMPTY(__VA_ARGS__), 0, GMOCK_PP_NARG(__VA_ARGS__))

// Expands to 1 if the first argument starts with something in parentheses,
// otherwise to 0.
#define GMOCK_PP_IS_BEGIN_PARENS(...)                    \
  GMOCK_PP_INTERNAL_ALTERNATE_HEAD(                      \
      GMOCK_PP_CAT(GMOCK_PP_INTERNAL_IBP_IS_VARIADIC_R_, \
                   GMOCK_PP_INTERNAL_IBP_IS_VARIADIC_C __VA_ARGS__))

// Expands to 1 is there is only one argument and it is enclosed in parentheses.
#define GMOCK_PP_IS_ENCLOSED_PARENS(...)             \
  GMOCK_PP_IF(GMOCK_PP_IS_BEGIN_PARENS(__VA_ARGS__), \
              GMOCK_PP_IS_EMPTY(GMOCK_PP_EMPTY __VA_ARGS__), 0)

// Remove the parens, requires GMOCK_PP_IS_ENCLOSED_PARENS(args) => 1.
#define GMOCK_PP_REMOVE_PARENS(...) GMOCK_PP_INTERNAL_REMOVE_PARENS __VA_ARGS__

// Expands to _Macro(0, _Data, e1) _Macro(1, _Data, e2) ... _Macro(K -1, _Data,
// eK) as many of GMOCK_INTERNAL_NARG0 _Tuple.
// Requires: * |_Macro| can be called with 3 arguments.
//           * |_Tuple| expansion has no more than 15 elements.
#define GMOCK_PP_FOR_EACH(_Macro, _Data, _Tuple)                        \
  GMOCK_PP_CAT(GMOCK_PP_INTERNAL_FOR_EACH_IMPL_, GMOCK_PP_NARG0 _Tuple) \
  (0, _Macro, _Data, _Tuple)

// Expands to _Macro(0, _Data, ) _Macro(1, _Data, ) ... _Macro(K - 1, _Data, )
// Empty if _K = 0.
// Requires: * |_Macro| can be called with 3 arguments.
//           * |_K| literal between 0 and 15
#define GMOCK_PP_REPEAT(_Macro, _Data, _N)           \
  GMOCK_PP_CAT(GMOCK_PP_INTERNAL_FOR_EACH_IMPL_, _N) \
  (0, _Macro, _Data, GMOCK_PP_INTENRAL_EMPTY_TUPLE)

// Increments the argument, requires the argument to be between 0 and 15.
#define GMOCK_PP_INC(_i) GMOCK_PP_CAT(GMOCK_PP_INTERNAL_INC_, _i)

// Returns comma if _i != 0. Requires _i to be between 0 and 15.
#define GMOCK_PP_COMMA_IF(_i) GMOCK_PP_CAT(GMOCK_PP_INTERNAL_COMMA_IF_, _i)

// Internal details follow. Do not use any of these symbols outside of this
// file or we will break your code.
#define GMOCK_PP_INTENRAL_EMPTY_TUPLE (, , , , , , , , , , , , , , , )
#define GMOCK_PP_INTERNAL_CAT(_1, _2) _1##_2
#define GMOCK_PP_INTERNAL_STRINGIZE(...) #__VA_ARGS__
#define GMOCK_PP_INTERNAL_INTERNAL_16TH(_1, _2, _3, _4, _5, _6, _7, _8, _9, \
                                        _10, _11, _12, _13, _14, _15, _16,  \
                                        ...)                                \
  _16
#define GMOCK_PP_INTERNAL_CAT_5(_1, _2, _3, _4, _5) _1##_2##_3##_4##_5
#define GMOCK_PP_INTERNAL_IS_EMPTY(_1, _2, _3, _4)                             \
  GMOCK_PP_HAS_COMMA(GMOCK_PP_INTERNAL_CAT_5(GMOCK_PP_INTERNAL_IS_EMPTY_CASE_, \
                                             _1, _2, _3, _4))
#define GMOCK_PP_INTERNAL_IS_EMPTY_CASE_0001 ,
#define GMOCK_PP_INTERNAL_IF_1(_Then, _Else) _Then
#define GMOCK_PP_INTERNAL_IF_0(_Then, _Else) _Else
#define GMOCK_PP_INTERNAL_HEAD(_1, ...) _1
#define GMOCK_PP_INTERNAL_TAIL(_1, ...) __VA_ARGS__

#if GMOCK_PP_INTERNAL_USE_MSVC
#define GMOCK_PP_INTERNAL_NARG_CAT(_1, _2) GMOCK_PP_INTERNAL_NARG_CAT_I(_1, _2)
#define GMOCK_PP_INTERNAL_HEAD_CAT(_1, _2) GMOCK_PP_INTERNAL_HEAD_CAT_I(_1, _2)
#define GMOCK_PP_INTERNAL_HAS_COMMA_CAT(_1, _2) \
  GMOCK_PP_INTERNAL_HAS_COMMA_CAT_I(_1, _2)
#define GMOCK_PP_INTERNAL_TAIL_CAT(_1, _2) GMOCK_PP_INTERNAL_TAIL_CAT_I(_1, _2)
#define GMOCK_PP_INTERNAL_VARIADIC_CALL_CAT(_1, _2) \
  GMOCK_PP_INTERNAL_VARIADIC_CALL_CAT_I(_1, _2)
#define GMOCK_PP_INTERNAL_NARG_CAT_I(_1, _2) _1##_2
#define GMOCK_PP_INTERNAL_HEAD_CAT_I(_1, _2) _1##_2
#define GMOCK_PP_INTERNAL_HAS_COMMA_CAT_I(_1, _2) _1##_2
#define GMOCK_PP_INTERNAL_TAIL_CAT_I(_1, _2) _1##_2
#define GMOCK_PP_INTERNAL_VARIADIC_CALL_CAT_I(_1, _2) _1##_2
#define GMOCK_PP_INTERNAL_ALTERNATE_HEAD(...) \
  GMOCK_PP_INTERNAL_ALTERNATE_HEAD_CAT(GMOCK_PP_HEAD(__VA_ARGS__), )
#define GMOCK_PP_INTERNAL_ALTERNATE_HEAD_CAT(_1, _2) \
  GMOCK_PP_INTERNAL_ALTERNATE_HEAD_CAT_I(_1, _2)
#define GMOCK_PP_INTERNAL_ALTERNATE_HEAD_CAT_I(_1, _2) _1##_2
#else  // GMOCK_PP_INTERNAL_USE_MSVC
#define GMOCK_PP_INTERNAL_ALTERNATE_HEAD(...) GMOCK_PP_HEAD(__VA_ARGS__)
#endif  // GMOCK_PP_INTERNAL_USE_MSVC

#define GMOCK_PP_INTERNAL_IBP_IS_VARIADIC_C(...) 1 _
#define GMOCK_PP_INTERNAL_IBP_IS_VARIADIC_R_1 1,
#define GMOCK_PP_INTERNAL_IBP_IS_VARIADIC_R_GMOCK_PP_INTERNAL_IBP_IS_VARIADIC_C \
  0,
#define GMOCK_PP_INTERNAL_REMOVE_PARENS(...) __VA_ARGS__
#define GMOCK_PP_INTERNAL_INC_0 1
#define GMOCK_PP_INTERNAL_INC_1 2
#define GMOCK_PP_INTERNAL_INC_2 3
#define GMOCK_PP_INTERNAL_INC_3 4
#define GMOCK_PP_INTERNAL_INC_4 5
#define GMOCK_PP_INTERNAL_INC_5 6
#define GMOCK_PP_INTERNAL_INC_6 7
#define GMOCK_PP_INTERNAL_INC_7 8
#define GMOCK_PP_INTERNAL_INC_8 9
#define GMOCK_PP_INTERNAL_INC_9 10
#define GMOCK_PP_INTERNAL_INC_10 11
#define GMOCK_PP_INTERNAL_INC_11 12
#define GMOCK_PP_INTERNAL_INC_12 13
#define GMOCK_PP_INTERNAL_INC_13 14
#define GMOCK_PP_INTERNAL_INC_14 15
#define GMOCK_PP_INTERNAL_INC_15 16
#define GMOCK_PP_INTERNAL_COMMA_IF_0
#define GMOCK_PP_INTERNAL_COMMA_IF_1 ,
#define GMOCK_PP_INTERNAL_COMMA_IF_2 ,
#define GMOCK_PP_INTERNAL_COMMA_IF_3 ,
#define GMOCK_PP_INTERNAL_COMMA_IF_4 ,
#define GMOCK_PP_INTERNAL_COMMA_IF_5 ,
#define GMOCK_PP_INTERNAL_COMMA_IF_6 ,
#define GMOCK_PP_INTERNAL_COMMA_IF_7 ,
#define GMOCK_PP_INTERNAL_COMMA_IF_8 ,
#define GMOCK_PP_INTERNAL_COMMA_IF_9 ,
#define GMOCK_PP_INTERNAL_COMMA_IF_10 ,
#define GMOCK_PP_INTERNAL_COMMA_IF_11 ,
#define GMOCK_PP_INTERNAL_COMMA_IF_12 ,
#define GMOCK_PP_INTERNAL_COMMA_IF_13 ,
#define GMOCK_PP_INTERNAL_COMMA_IF_14 ,
#define GMOCK_PP_INTERNAL_COMMA_IF_15 ,
#define GMOCK_PP_INTERNAL_CALL_MACRO(_Macro, _i, _Data, _element) \
  _Macro(_i, _Data, _element)
#define GMOCK_PP_INTERNAL_FOR_EACH_IMPL_0(_i, _Macro, _Data, _Tuple)
#define GMOCK_PP_INTERNAL_FOR_EACH_IMPL_1(_i, _Macro, _Data, _Tuple) \
  GMOCK_PP_INTERNAL_CALL_MACRO(_Macro, _i, _Data, GMOCK_PP_HEAD _Tuple)
#define GMOCK_PP_INTERNAL_FOR_EACH_IMPL_2(_i, _Macro, _Data, _Tuple)    \
  GMOCK_PP_INTERNAL_CALL_MACRO(_Macro, _i, _Data, GMOCK_PP_HEAD _Tuple) \
  GMOCK_PP_INTERNAL_FOR_EACH_IMPL_1(GMOCK_PP_INC(_i), _Macro, _Data,    \
                                    (GMOCK_PP_TAIL _Tuple))
#define GMOCK_PP_INTERNAL_FOR_EACH_IMPL_3(_i, _Macro, _Data, _Tuple)    \
  GMOCK_PP_INTERNAL_CALL_MACRO(_Macro, _i, _Data, GMOCK_PP_HEAD _Tuple) \
  GMOCK_PP_INTERNAL_FOR_EACH_IMPL_2(GMOCK_PP_INC(_i), _Macro, _Data,    \
                                    (GMOCK_PP_TAIL _Tuple))
#define GMOCK_PP_INTERNAL_FOR_EACH_IMPL_4(_i, _Macro, _Data, _Tuple)    \
  GMOCK_PP_INTERNAL_CALL_MACRO(_Macro, _i, _Data, GMOCK_PP_HEAD _Tuple) \
  GMOCK_PP_INTERNAL_FOR_EACH_IMPL_3(GMOCK_PP_INC(_i), _Macro, _Data,    \
                                    (GMOCK_PP_TAIL _Tuple))
#define GMOCK_PP_INTERNAL_FOR_EACH_IMPL_5(_i, _Macro, _Data, _Tuple)    \
  GMOCK_PP_INTERNAL_CALL_MACRO(_Macro, _i, _Data, GMOCK_PP_HEAD _Tuple) \
  GMOCK_PP_INTERNAL_FOR_EACH_IMPL_4(GMOCK_PP_INC(_i), _Macro, _Data,    \
                                    (GMOCK_PP_TAIL _Tuple))
#define GMOCK_PP_INTERNAL_FOR_EACH_IMPL_6(_i, _Macro, _Data, _Tuple)    \
  GMOCK_PP_INTERNAL_CALL_MACRO(_Macro, _i, _Data, GMOCK_PP_HEAD _Tuple) \
  GMOCK_PP_INTERNAL_FOR_EACH_IMPL_5(GMOCK_PP_INC(_i), _Macro, _Data,    \
                                    (GMOCK_PP_TAIL _Tuple))
#define GMOCK_PP_INTERNAL_FOR_EACH_IMPL_7(_i, _Macro, _Data, _Tuple)    \
  GMOCK_PP_INTERNAL_CALL_MACRO(_Macro, _i, _Data, GMOCK_PP_HEAD _Tuple) \
  GMOCK_PP_INTERNAL_FOR_EACH_IMPL_6(GMOCK_PP_INC(_i), _Macro, _Data,    \
                                    (GMOCK_PP_TAIL _Tuple))
#define GMOCK_PP_INTERNAL_FOR_EACH_IMPL_8(_i, _Macro, _Data, _Tuple)    \
  GMOCK_PP_INTERNAL_CALL_MACRO(_Macro, _i, _Data, GMOCK_PP_HEAD _Tuple) \
  GMOCK_PP_INTERNAL_FOR_EACH_IMPL_7(GMOCK_PP_INC(_i), _Macro, _Data,    \
                                    (GMOCK_PP_TAIL _Tuple))
#define GMOCK_PP_INTERNAL_FOR_EACH_IMPL_9(_i, _Macro, _Data, _Tuple)    \
  GMOCK_PP_INTERNAL_CALL_MACRO(_Macro, _i, _Data, GMOCK_PP_HEAD _Tuple) \
  GMOCK_PP_INTERNAL_FOR_EACH_IMPL_8(GMOCK_PP_INC(_i), _Macro, _Data,    \
                                    (GMOCK_PP_TAIL _Tuple))
#define GMOCK_PP_INTERNAL_FOR_EACH_IMPL_10(_i, _Macro, _Data, _Tuple)   \
  GMOCK_PP_INTERNAL_CALL_MACRO(_Macro, _i, _Data, GMOCK_PP_HEAD _Tuple) \
  GMOCK_PP_INTERNAL_FOR_EACH_IMPL_9(GMOCK_PP_INC(_i), _Macro, _Data,    \
                                    (GMOCK_PP_TAIL _Tuple))
#define GMOCK_PP_INTERNAL_FOR_EACH_IMPL_11(_i, _Macro, _Data, _Tuple)   \
  GMOCK_PP_INTERNAL_CALL_MACRO(_Macro, _i, _Data, GMOCK_PP_HEAD _Tuple) \
  GMOCK_PP_INTERNAL_FOR_EACH_IMPL_10(GMOCK_PP_INC(_i), _Macro, _Data,   \
                                     (GMOCK_PP_TAIL _Tuple))
#define GMOCK_PP_INTERNAL_FOR_EACH_IMPL_12(_i, _Macro, _Data, _Tuple)   \
  GMOCK_PP_INTERNAL_CALL_MACRO(_Macro, _i, _Data, GMOCK_PP_HEAD _Tuple) \
  GMOCK_PP_INTERNAL_FOR_EACH_IMPL_11(GMOCK_PP_INC(_i), _Macro, _Data,   \
                                     (GMOCK_PP_TAIL _Tuple))
#define GMOCK_PP_INTERNAL_FOR_EACH_IMPL_13(_i, _Macro, _Data, _Tuple)   \
  GMOCK_PP_INTERNAL_CALL_MACRO(_Macro, _i, _Data, GMOCK_PP_HEAD _Tuple) \
  GMOCK_PP_INTERNAL_FOR_EACH_IMPL_12(GMOCK_PP_INC(_i), _Macro, _Data,   \
                                     (GMOCK_PP_TAIL _Tuple))
#define GMOCK_PP_INTERNAL_FOR_EACH_IMPL_14(_i, _Macro, _Data, _Tuple)   \
  GMOCK_PP_INTERNAL_CALL_MACRO(_Macro, _i, _Data, GMOCK_PP_HEAD _Tuple) \
  GMOCK_PP_INTERNAL_FOR_EACH_IMPL_13(GMOCK_PP_INC(_i), _Macro, _Data,   \
                                     (GMOCK_PP_TAIL _Tuple))
#define GMOCK_PP_INTERNAL_FOR_EACH_IMPL_15(_i, _Macro, _Data, _Tuple)   \
  GMOCK_PP_INTERNAL_CALL_MACRO(_Macro, _i, _Data, GMOCK_PP_HEAD _Tuple) \
  GMOCK_PP_INTERNAL_FOR_EACH_IMPL_14(GMOCK_PP_INC(_i), _Macro, _Data,   \
                                     (GMOCK_PP_TAIL _Tuple))

#endif  // THIRD_PARTY_GOOGLETEST_GOOGLEMOCK_INCLUDE_GMOCK_INTERNAL_GMOCK_PP_H_