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