#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) … // Expands and stringifies the only argument. #define GMOCK_PP_STRINGIZE(...) … // 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) … // 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(...) … // 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(...) … // Returns the first argument. #define GMOCK_PP_HEAD(...) … // Returns the tail. A variadic list of all arguments minus the first. Requires // at least one argument. #define GMOCK_PP_TAIL(...) … // Calls CAT(_Macro, NARG(__VA_ARGS__))(__VA_ARGS__) #define GMOCK_PP_VARIADIC_CALL(_Macro, ...) … // 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(...) … // Evaluates to _Then if _Cond is 1 and _Else if _Cond is 0. #define GMOCK_PP_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) … // 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(...) … // Expands to 1 if the first argument starts with something in parentheses, // otherwise to 0. #define GMOCK_PP_IS_BEGIN_PARENS(...) … // Expands to 1 is there is only one argument and it is enclosed in parentheses. #define GMOCK_PP_IS_ENCLOSED_PARENS(...) … // Remove the parens, requires GMOCK_PP_IS_ENCLOSED_PARENS(args) => 1. #define GMOCK_PP_REMOVE_PARENS(...) … // 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) … // 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) … // Increments the argument, requires the argument to be between 0 and 15. #define GMOCK_PP_INC(_i) … // Returns comma if _i != 0. Requires _i to be between 0 and 15. #define GMOCK_PP_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) … #define GMOCK_PP_INTERNAL_STRINGIZE(...) … #define GMOCK_PP_INTERNAL_CAT_5(_1, _2, _3, _4, _5) … #define GMOCK_PP_INTERNAL_IS_EMPTY(_1, _2, _3, _4) … #define GMOCK_PP_INTERNAL_IS_EMPTY_CASE_0001 … #define GMOCK_PP_INTERNAL_IF_1(_Then, _Else) … #define GMOCK_PP_INTERNAL_IF_0(_Then, _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, \ ...) … #define GMOCK_PP_INTERNAL_16TH(_Args) … #define GMOCK_PP_INTERNAL_INTERNAL_HEAD(_1, ...) … #define GMOCK_PP_INTERNAL_HEAD(_Args) … #define GMOCK_PP_INTERNAL_INTERNAL_TAIL(_1, ...) … #define GMOCK_PP_INTERNAL_TAIL(_Args) … #define GMOCK_PP_INTERNAL_IBP_IS_VARIADIC_C(...) … #define GMOCK_PP_INTERNAL_IBP_IS_VARIADIC_R_1 … #define GMOCK_PP_INTERNAL_IBP_IS_VARIADIC_R_GMOCK_PP_INTERNAL_IBP_IS_VARIADIC_C … #define GMOCK_PP_INTERNAL_REMOVE_PARENS(...) … #define GMOCK_PP_INTERNAL_INC_0 … #define GMOCK_PP_INTERNAL_INC_1 … #define GMOCK_PP_INTERNAL_INC_2 … #define GMOCK_PP_INTERNAL_INC_3 … #define GMOCK_PP_INTERNAL_INC_4 … #define GMOCK_PP_INTERNAL_INC_5 … #define GMOCK_PP_INTERNAL_INC_6 … #define GMOCK_PP_INTERNAL_INC_7 … #define GMOCK_PP_INTERNAL_INC_8 … #define GMOCK_PP_INTERNAL_INC_9 … #define GMOCK_PP_INTERNAL_INC_10 … #define GMOCK_PP_INTERNAL_INC_11 … #define GMOCK_PP_INTERNAL_INC_12 … #define GMOCK_PP_INTERNAL_INC_13 … #define GMOCK_PP_INTERNAL_INC_14 … #define GMOCK_PP_INTERNAL_INC_15 … #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) … #define GMOCK_PP_INTERNAL_FOR_EACH_IMPL_0(_i, _Macro, _Data, _Tuple) … #define GMOCK_PP_INTERNAL_FOR_EACH_IMPL_1(_i, _Macro, _Data, _Tuple) … #define GMOCK_PP_INTERNAL_FOR_EACH_IMPL_2(_i, _Macro, _Data, _Tuple) … #define GMOCK_PP_INTERNAL_FOR_EACH_IMPL_3(_i, _Macro, _Data, _Tuple) … #define GMOCK_PP_INTERNAL_FOR_EACH_IMPL_4(_i, _Macro, _Data, _Tuple) … #define GMOCK_PP_INTERNAL_FOR_EACH_IMPL_5(_i, _Macro, _Data, _Tuple) … #define GMOCK_PP_INTERNAL_FOR_EACH_IMPL_6(_i, _Macro, _Data, _Tuple) … #define GMOCK_PP_INTERNAL_FOR_EACH_IMPL_7(_i, _Macro, _Data, _Tuple) … #define GMOCK_PP_INTERNAL_FOR_EACH_IMPL_8(_i, _Macro, _Data, _Tuple) … #define GMOCK_PP_INTERNAL_FOR_EACH_IMPL_9(_i, _Macro, _Data, _Tuple) … #define GMOCK_PP_INTERNAL_FOR_EACH_IMPL_10(_i, _Macro, _Data, _Tuple) … #define GMOCK_PP_INTERNAL_FOR_EACH_IMPL_11(_i, _Macro, _Data, _Tuple) … #define GMOCK_PP_INTERNAL_FOR_EACH_IMPL_12(_i, _Macro, _Data, _Tuple) … #define GMOCK_PP_INTERNAL_FOR_EACH_IMPL_13(_i, _Macro, _Data, _Tuple) … #define GMOCK_PP_INTERNAL_FOR_EACH_IMPL_14(_i, _Macro, _Data, _Tuple) … #define GMOCK_PP_INTERNAL_FOR_EACH_IMPL_15(_i, _Macro, _Data, _Tuple) … #endif // GOOGLEMOCK_INCLUDE_GMOCK_INTERNAL_GMOCK_PP_H_
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