| #ifndef ANDROID_PDX_RPC_MACROS_H_ |
| #define ANDROID_PDX_RPC_MACROS_H_ |
| |
| // Macros to apply other macros over all elements in a list. |
| // |
| // For example, for a macro A(x) and B(x, y): |
| // - FOR_EACH(A, 1, 2, 3) -> A(1) A(2) A(3). |
| // - FOR_EACH_BINARY(B, z, 1, 2, 3) -> B(z, 1) B(z, 2) B(z, 3) |
| // - FOR_EACH_LIST(A, 1, 2, 3) -> A(1), B(2), C(3) |
| // - FOR_EACH_BINARY_LIST(B, z, 1, 2, 3) -> B(z, 1), B(z, 2), B(z, 3) |
| // |
| // Empty lists are supported and will produce no output. |
| |
| // Recursive expansion macros. |
| #define _PDX_EXPAND0(...) __VA_ARGS__ |
| #define _PDX_EXPAND1(...) _PDX_EXPAND0(_PDX_EXPAND0(_PDX_EXPAND0(__VA_ARGS__))) |
| #define _PDX_EXPAND2(...) _PDX_EXPAND1(_PDX_EXPAND1(_PDX_EXPAND1(__VA_ARGS__))) |
| #define _PDX_EXPAND3(...) _PDX_EXPAND2(_PDX_EXPAND2(_PDX_EXPAND2(__VA_ARGS__))) |
| #define _PDX_EXPAND4(...) _PDX_EXPAND3(_PDX_EXPAND3(_PDX_EXPAND3(__VA_ARGS__))) |
| #define _PDX_EXPAND(...) _PDX_EXPAND4(_PDX_EXPAND4(_PDX_EXPAND4(__VA_ARGS__))) |
| |
| // Required to workaround a bug in the VC++ preprocessor. |
| #define _PDX_INDIRECT_EXPAND(macro, args) macro args |
| |
| // Defines a step separation for macro expansion. |
| #define _PDX_SEPARATOR |
| |
| // Clears any remaining contents wrapped in parentheses. |
| #define _PDX_CLEAR(...) |
| |
| // Introduces a first dummy argument and _PDX_CLEAR as second argument. |
| #define _PDX_CLEAR_IF_LAST() _, _PDX_CLEAR |
| |
| // Returns the first argument of a list. |
| #define _PDX_FIRST_ARG(first, ...) first |
| |
| // Returns the second argument of a list. |
| #define _PDX_SECOND_ARG(_, second, ...) second |
| |
| // Expands the arguments and introduces a separator. |
| #define _PDX_EXPAND_NEXT_FUNC(_, next_func, ...) \ |
| _PDX_INDIRECT_EXPAND(_PDX_SECOND_ARG, (_, next_func)) \ |
| _PDX_SEPARATOR |
| |
| // Returns next_func if the next element is not (), or _PDX_CLEAR |
| // otherwise. |
| // |
| // _PDX_CLEAR_IF_LAST inserts an extra first dummy argument if peek is (). |
| #define _PDX_NEXT_FUNC(next_element, next_func) \ |
| _PDX_EXPAND_NEXT_FUNC(_PDX_CLEAR_IF_LAST next_element, next_func) |
| |
| // Macros for the unary version of PDX_FOR_EACH. |
| |
| // Applies the unary macro. Duplicated for macro recursive expansion. |
| #define _PDX_APPLY_1(macro, head, next, ...) \ |
| macro(head) _PDX_NEXT_FUNC(next, _PDX_APPLY_2)(macro, next, __VA_ARGS__) |
| |
| // Applies the unary macro. Duplicated for macro recursive expansion. |
| #define _PDX_APPLY_2(macro, head, next, ...) \ |
| macro(head) _PDX_NEXT_FUNC(next, _PDX_APPLY_1)(macro, next, __VA_ARGS__) |
| |
| // Stops expansion if __VA_ARGS__ is empty, calling _PDX_APPLY_1 |
| // otherwise. |
| #define _PDX_HANDLE_EMPTY_ARGS(macro, ...) \ |
| _PDX_NEXT_FUNC(_PDX_FIRST_ARG(__VA_ARGS__()), _PDX_APPLY_1) \ |
| (macro, __VA_ARGS__, ()) |
| |
| // Applies a unary macro over all the elements in a list. |
| #define PDX_FOR_EACH(macro, ...) \ |
| _PDX_EXPAND(_PDX_HANDLE_EMPTY_ARGS(macro, __VA_ARGS__)) |
| |
| // Applies the unary macro at the end of a list. Duplicated for macro recursive |
| // expansion. |
| #define _PDX_APPLY_LIST_1(macro, head, next, ...) \ |
| , macro(head) \ |
| _PDX_NEXT_FUNC(next, _PDX_APPLY_LIST_2)(macro, next, __VA_ARGS__) |
| |
| // Applies the unary macro at the end of a list. Duplicated for macro recursive |
| // expansion. |
| #define _PDX_APPLY_LIST_2(macro, head, next, ...) \ |
| , macro(head) \ |
| _PDX_NEXT_FUNC(next, _PDX_APPLY_LIST_1)(macro, next, __VA_ARGS__) |
| |
| // Applies the unary macro at the start of a list. |
| #define _PDX_APPLY_LIST_0(macro, head, next, ...) \ |
| macro(head) _PDX_NEXT_FUNC(next, _PDX_APPLY_LIST_1)(macro, next, __VA_ARGS__) |
| |
| // Stops expansion if __VA_ARGS__ is empty, calling _PDX_APPLY_LIST_0 |
| // otherwise. |
| #define _PDX_HANDLE_EMPTY_LIST(macro, ...) \ |
| _PDX_NEXT_FUNC(_PDX_FIRST_ARG(__VA_ARGS__()), _PDX_APPLY_LIST_0) \ |
| (macro, __VA_ARGS__, ()) |
| |
| // Applies a unary macro over all the elements in a list. |
| #define PDX_FOR_EACH_LIST(macro, ...) \ |
| _PDX_EXPAND(_PDX_HANDLE_EMPTY_LIST(macro, __VA_ARGS__)) |
| |
| // Macros for the binary version of PDX_FOR_EACH. |
| |
| // Applies the binary macro. Duplicated for macro recursive expansion. |
| #define _PDX_APPLY_BINARY_1(macro, arg, head, next, ...) \ |
| macro(arg, head) \ |
| _PDX_NEXT_FUNC(next, _PDX_APPLY_BINARY_2)(macro, arg, next, __VA_ARGS__) |
| |
| // Applies the binary macro. Duplicated for macro recursive expansion. |
| #define _PDX_APPLY_BINARY_2(macro, arg, head, next, ...) \ |
| macro(arg, head) \ |
| _PDX_NEXT_FUNC(next, _PDX_APPLY_BINARY_1)(macro, arg, next, __VA_ARGS__) |
| |
| // Version of _PDX_HANDLE_EMPTY_ARGS that takes 1 fixed argument for a |
| // binary macro. |
| #define _PDX_HANDLE_EMPTY_ARGS_BINARY(macro, arg, ...) \ |
| _PDX_NEXT_FUNC(_PDX_FIRST_ARG(__VA_ARGS__()), _PDX_APPLY_BINARY_1) \ |
| (macro, arg, __VA_ARGS__, ()) |
| |
| // Applies a binary macro over all the elements in a list and a given argument. |
| #define PDX_FOR_EACH_BINARY(macro, arg, ...) \ |
| _PDX_EXPAND(_PDX_HANDLE_EMPTY_ARGS_BINARY(macro, arg, __VA_ARGS__)) |
| |
| // Applies the binary macro at the end of a list. Duplicated for macro recursive |
| // expansion. |
| #define _PDX_APPLY_BINARY_LIST_1(macro, arg, head, next, ...) \ |
| , macro(arg, head) _PDX_NEXT_FUNC(next, _PDX_APPLY_BINARY_LIST_2)( \ |
| macro, arg, next, __VA_ARGS__) |
| |
| // Applies the binary macro at the end of a list. Duplicated for macro recursive |
| // expansion. |
| #define _PDX_APPLY_BINARY_LIST_2(macro, arg, head, next, ...) \ |
| , macro(arg, head) _PDX_NEXT_FUNC(next, _PDX_APPLY_BINARY_LIST_1)( \ |
| macro, arg, next, __VA_ARGS__) |
| |
| // Applies the binary macro at the start of a list. Duplicated for macro |
| // recursive expansion. |
| #define _PDX_APPLY_BINARY_LIST_0(macro, arg, head, next, ...) \ |
| macro(arg, head) _PDX_NEXT_FUNC(next, _PDX_APPLY_BINARY_LIST_1)( \ |
| macro, arg, next, __VA_ARGS__) |
| |
| // Version of _PDX_HANDLE_EMPTY_LIST that takes 1 fixed argument for a |
| // binary macro. |
| #define _PDX_HANDLE_EMPTY_LIST_BINARY(macro, arg, ...) \ |
| _PDX_NEXT_FUNC(_PDX_FIRST_ARG(__VA_ARGS__()), _PDX_APPLY_BINARY_LIST_0) \ |
| (macro, arg, __VA_ARGS__, ()) |
| |
| // Applies a binary macro over all the elements in a list and a given argument. |
| #define PDX_FOR_EACH_BINARY_LIST(macro, arg, ...) \ |
| _PDX_EXPAND(_PDX_HANDLE_EMPTY_LIST_BINARY(macro, arg, __VA_ARGS__)) |
| |
| #endif // ANDROID_PDX_RPC_MACROS_H_ |