#ifndef GOOGLEMOCK_INCLUDE_GMOCK_INTERNAL_GMOCK_PP_H_ #define GOOGLEMOCK_INCLUDE_GMOCK_INTERNAL_GMOCK_PP_H_ // 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 // 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_16TH( \ (__VA_ARGS__, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0)) // 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_16TH( \ (__VA_ARGS__, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0)) // Returns the first argument. #define GMOCK_PP_HEAD(...) GMOCK_PP_INTERNAL_HEAD((__VA_ARGS__, unusedArg)) // 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((__VA_ARGS__)) // Calls CAT(_Macro, NARG(__VA_ARGS__))(__VA_ARGS__) #define GMOCK_PP_VARIADIC_CALL(_Macro, ...) \ GMOCK_PP_IDENTITY( \ GMOCK_PP_CAT(_Macro, GMOCK_PP_NARG(__VA_ARGS__))(__VA_ARGS__)) // 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) // Similar to GMOCK_PP_IF but takes _Then and _Else in parentheses. // // GMOCK_PP_GENERIC_IF(1, (a, b, c), (d, e, f)) => a, b, c // GMOCK_PP_GENERIC_IF(0, (a, b, c), (d, e, f)) => d, e, f // #define GMOCK_PP_GENERIC_IF(_Cond, _Then, _Else) \ GMOCK_PP_REMOVE_PARENS(GMOCK_PP_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_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_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 // Because of MSVC treating a token with a comma in it as a single token when // passed to another macro, we need to force it to evaluate it as multiple // tokens. We do that by using a "IDENTITY(MACRO PARENTHESIZED_ARGS)" macro. We // define one per possible macro that relies on this behavior. Note "_Args" must // be parenthesized. #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_16TH(_Args) \ GMOCK_PP_IDENTITY(GMOCK_PP_INTERNAL_INTERNAL_16TH _Args) #define GMOCK_PP_INTERNAL_INTERNAL_HEAD(_1, ...) _1 #define GMOCK_PP_INTERNAL_HEAD(_Args) \ GMOCK_PP_IDENTITY(GMOCK_PP_INTERNAL_INTERNAL_HEAD _Args) #define GMOCK_PP_INTERNAL_INTERNAL_TAIL(_1, ...) __VA_ARGS__ #define GMOCK_PP_INTERNAL_TAIL(_Args) \ GMOCK_PP_IDENTITY(GMOCK_PP_INTERNAL_INTERNAL_TAIL _Args) #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 // GOOGLEMOCK_INCLUDE_GMOCK_INTERNAL_GMOCK_PP_H_