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preprocessor: add map macro with one argument

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Danny Robson 2016-03-14 22:32:25 +11:00
parent 039113b661
commit df08e33552
1 changed files with 88 additions and 24 deletions
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108
preprocessor.hpp
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@ -21,54 +21,118 @@
#define PASTE_DETAIL(x, y) x##y #define PASTE_DETAIL(x, y) x##y
#define PASTE(x, y) PASTE_DETAIL(x, y) #define PASTE(x, y) PASTE_DETAIL(x, y)
#define PASTE_LIST(x,y) PASTE(x,y),
#define NAMESPACE_LIST(x,y) x::y,
#define STRINGIZE_DETAIL(x) #x #define STRINGIZE_DETAIL(x) #x
#define STRINGIZE(x) STRINGIZE_DETAIL(x) #define STRINGIZE(x) STRINGIZE_DETAIL(x)
#define STRINGIZE_LIST(x) STRINGIZE(x), #define STRINGIZE_LIST(x) STRINGIZE(x),
#define STATIC_ASSERT(MSG) static_assert(false, MSG);
/////////////////////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////////////////////
// Varags functional style map // Varags functional style map
// //
// Based off a technique seen on StackOverflow: // Based off a technique seen on StackOverflow:
// http://stackoverflow.com/questions/11761703/overloading-macro-on-number-of-arguments // http://stackoverflow.com/questions/11761703/overloading-macro-on-number-of-arguments
#define MAP_01(F, X) F(X) #define MAP_0_01(F, X) F(X)
#define MAP_02(F, X, ...) F(X)MAP_01(F, __VA_ARGS__) #define MAP_0_02(F, X, ...) F(X)MAP_0_01(F, __VA_ARGS__)
#define MAP_03(F, X, ...) F(X)MAP_02(F, __VA_ARGS__) #define MAP_0_03(F, X, ...) F(X)MAP_0_02(F, __VA_ARGS__)
#define MAP_04(F, X, ...) F(X)MAP_03(F, __VA_ARGS__) #define MAP_0_04(F, X, ...) F(X)MAP_0_03(F, __VA_ARGS__)
#define MAP_05(F, X, ...) F(X)MAP_04(F, __VA_ARGS__) #define MAP_0_05(F, X, ...) F(X)MAP_0_04(F, __VA_ARGS__)
#define MAP_06(F, X, ...) F(X)MAP_05(F, __VA_ARGS__) #define MAP_0_06(F, X, ...) F(X)MAP_0_05(F, __VA_ARGS__)
#define MAP_07(F, X, ...) F(X)MAP_06(F, __VA_ARGS__) #define MAP_0_07(F, X, ...) F(X)MAP_0_06(F, __VA_ARGS__)
#define MAP_08(F, X, ...) F(X)MAP_07(F, __VA_ARGS__) #define MAP_0_08(F, X, ...) F(X)MAP_0_07(F, __VA_ARGS__)
#define MAP_09(F, X, ...) F(X)MAP_08(F, __VA_ARGS__) #define MAP_0_09(F, X, ...) F(X)MAP_0_08(F, __VA_ARGS__)
#define MAP_10(F, X, ...) F(X)MAP_09(F, __VA_ARGS__) #define MAP_0_10(F, X, ...) F(X)MAP_0_09(F, __VA_ARGS__)
#define MAP_11(F, X, ...) F(X)MAP_10(F, __VA_ARGS__) #define MAP_0_11(F, X, ...) F(X)MAP_0_10(F, __VA_ARGS__)
#define MAP_12(F, X, ...) F(X)MAP_11(F, __VA_ARGS__) #define MAP_0_12(F, X, ...) F(X)MAP_0_11(F, __VA_ARGS__)
#define MAP_13(F, X, ...) F(X)MAP_12(F, __VA_ARGS__) #define MAP_0_13(F, X, ...) F(X)MAP_0_12(F, __VA_ARGS__)
#define MAP_14(F, X, ...) F(X)MAP_13(F, __VA_ARGS__) #define MAP_0_14(F, X, ...) F(X)MAP_0_13(F, __VA_ARGS__)
#define MAP_15(F, X, ...) F(X)MAP_14(F, __VA_ARGS__) #define MAP_0_15(F, X, ...) F(X)MAP_0_14(F, __VA_ARGS__)
#define MAP_16(F, X, ...) F(X)MAP_15(F, __VA_ARGS__) #define MAP_0_16(F, X, ...) F(X)MAP_0_15(F, __VA_ARGS__)
#define MAP_1_01(F, A, X) F(A, X)
#define MAP_1_02(F, A, X, ...) F(A, X)MAP_1_01(F, A, __VA_ARGS__)
#define MAP_1_03(F, A, X, ...) F(A, X)MAP_1_02(F, A, __VA_ARGS__)
#define MAP_1_04(F, A, X, ...) F(A, X)MAP_1_03(F, A, __VA_ARGS__)
#define MAP_1_05(F, A, X, ...) F(A, X)MAP_1_04(F, A, __VA_ARGS__)
#define MAP_1_06(F, A, X, ...) F(A, X)MAP_1_05(F, A, __VA_ARGS__)
#define MAP_1_07(F, A, X, ...) F(A, X)MAP_1_06(F, A, __VA_ARGS__)
#define MAP_1_08(F, A, X, ...) F(A, X)MAP_1_07(F, A, __VA_ARGS__)
#define MAP_1_09(F, A, X, ...) F(A, X)MAP_1_08(F, A, __VA_ARGS__)
#define MAP_1_10(F, A, X, ...) F(A, X)MAP_1_09(F, A, __VA_ARGS__)
#define MAP_1_11(F, A, X, ...) F(A, X)MAP_1_10(F, A, __VA_ARGS__)
#define MAP_1_12(F, A, X, ...) F(A, X)MAP_1_11(F, A, __VA_ARGS__)
#define MAP_1_13(F, A, X, ...) F(A, X)MAP_1_12(F, A, __VA_ARGS__)
#define MAP_1_14(F, A, X, ...) F(A, X)MAP_1_13(F, A, __VA_ARGS__)
#define MAP_1_15(F, A, X, ...) F(A, X)MAP_1_14(F, A, __VA_ARGS__)
#define MAP_1_16(F, A, X, ...) F(A, X)MAP_1_15(F, A, __VA_ARGS__)
// Uses the sliding pairs dispatch technique: by passing __VA_ARGS__ as the // Uses the sliding pairs dispatch technique: by passing __VA_ARGS__ as the
// first set of variables and appending (reverse orderred) names of the // first set of variables and appending (reverse orderred) names of the
// corresponding macros, we get the name of the correct arity macro. // corresponding macros, we get the name of the correct arity macro.
//
// Ensure this is called with at least N+2 parameters otherwise GCC in
// particular will complain about requiring at least one value for varargs
#define ARITY_DISPATCH( \ #define ARITY_DISPATCH( \
_01,_02,_03,_04,_05,_06,_07,_08, \ _01,_02,_03,_04,_05,_06,_07,_08, \
_09,_10,_11,_12,_13,_14,_15,_16, \ _09,_10,_11,_12,_13,_14,_15,_16, \
NAME,... \ NAME,... \
) NAME ) NAME
// Map a macro across __VA_ARGS__. Can be easily expanded, but has non-obvious // Map a macro across __VA_ARGS__. Can be easily expanded, but has non-obvious
// failure mode when supported arity is exceeded. Don't use this, unless you // failure mode when supported arity is exceeded.
// really need the stringize operator, or other macro magic.
// //
// Just use C++ templates. Really... // Don't use this, unless you really need the stringize operator, or other
// macro magic.
//
// Just use templates. Really...
#define MAP(FUNC,...) \ #define MAP(FUNC,...) \
ARITY_DISPATCH(__VA_ARGS__, \ ARITY_DISPATCH(__VA_ARGS__, \
MAP_16, MAP_15, MAP_14, MAP_13, MAP_12, MAP_11, MAP_10, MAP_09, \ MAP_0_16, MAP_0_15, MAP_0_14, MAP_0_13, MAP_0_12, MAP_0_11, MAP_0_10, MAP_0_09, \
MAP_08, MAP_07, MAP_06, MAP_05, MAP_04, MAP_03, MAP_02, MAP_01 \ MAP_0_08, MAP_0_07, MAP_0_06, MAP_0_05, MAP_0_04, MAP_0_03, MAP_0_02, MAP_0_01, \
STATIC_ASSERT("invalid arity for MAP") \
)(FUNC, __VA_ARGS__) )(FUNC, __VA_ARGS__)
#define MAP1(FUNC,...) \
ARITY_DISPATCH(__VA_ARGS__, \
MAP_1_15, MAP_1_14, MAP_1_13, MAP_1_12, MAP_1_11, MAP_1_10, MAP_1_09, \
MAP_1_08, MAP_1_07, MAP_1_06, MAP_1_05, MAP_1_04, MAP_1_03, MAP_1_02, MAP_1_01, \
STATIC_ASSERT("invalid arity for MAP1") \
)(FUNC, __VA_ARGS__)
#define LITERAL_00 0
#define LITERAL_01 1
#define LITERAL_02 2
#define LITERAL_03 3
#define LITERAL_04 4
#define LITERAL_05 5
#define LITERAL_06 6
#define LITERAL_07 7
#define LITERAL_08 8
#define LITERAL_09 9
#define LITERAL_10 10
#define LITERAL_11 11
#define LITERAL_12 12
#define LITERAL_13 13
#define LITERAL_14 14
#define LITERAL_15 15
#define LITERAL_16 16
#define VA_ARGS_COUNT(...) \
ARITY_DISPATCH(__VA_ARGS__, \
LITERAL_16, LITERAL_15, LITERAL_14, LITERAL_13, \
LITERAL_12, LITERAL_11, LITERAL_10, LITERAL_09, \
LITERAL_08, LITERAL_07, LITERAL_06, LITERAL_05, \
LITERAL_04, LITERAL_03, LITERAL_02, LITERAL_01, \
STATIC_ASSERT("invalid value for VA_ARGS_COUNT")\
)
#endif #endif