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Avoid recursive macros

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This commit is contained in:
Joshua Cannon 2019-10-11 17:13:24 -05:00
parent 3e813465a4
commit e1b67b07f7
1 changed files with 28 additions and 22 deletions
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50
googlemock/include/gmock/internal/gmock-pp.h
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@ -26,30 +26,29 @@
// GMOCK_PP_NARG(PAIR) => 2
//
// Requires: the number of arguments after expansion is at most 15.
#define GMOCK_PP_NARG(...) \
GMOCK_PP_INTERNAL_INTERNAL_16TH( \
__VA_ARGS__, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1)
#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))
// 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_EXPAND_WITH( \
GMOCK_PP_INTERNAL_INTERNAL_16TH, \
(__VA_ARGS__, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0))
#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))
// Returns the first argument.
#define GMOCK_PP_HEAD(...) \
GMOCK_PP_INTERNAL_EXPAND_WITH(GMOCK_PP_INTERNAL_HEAD, (__VA_ARGS__))
GMOCK_PP_INTERNAL_HEAD((__VA_ARGS__))
// Returns the tail. A variadic list of all arguments minus the first. Requires
// at least one argument.
#define GMOCK_PP_TAIL(...) \
GMOCK_PP_INTERNAL_EXPAND_WITH(GMOCK_PP_INTERNAL_TAIL, (__VA_ARGS__))
GMOCK_PP_INTERNAL_TAIL((__VA_ARGS__))
// Calls CAT(_Macro, NARG(__VA_ARGS__))(__VA_ARGS__)
#define GMOCK_PP_VARIADIC_CALL(_Macro, ...) \
GMOCK_PP_INTERNAL_VARIADIC_CALL( \
_Macro, GMOCK_PP_NARG(__VA_ARGS__), __VA_ARGS__)
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`.
@ -147,10 +146,6 @@
#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_INTERNAL_16TH(_1, _2, _3, _4, _5, _6, _7, _8, _9, \
_10, _11, _12, _13, _14, _15, _16, \
...) \
_16
#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_, \
@ -158,13 +153,24 @@
#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
#define GMOCK_PP_INTERNAL_HEAD(_1, ...) _1
#define GMOCK_PP_INTERNAL_TAIL(_1, ...) __VA_ARGS__
// Workaround MSVC behavior of treating __VA_ARGS__ with commas as one arg
// _Args must be wrapped in parenthesis
#define GMOCK_PP_INTERNAL_EXPAND_WITH(_Macro, _Args) _Macro _Args
#define GMOCK_PP_INTERNAL_VARIADIC_CALL(_Macro, _N, ...) \
GMOCK_PP_INTERNAL_EXPAND_WITH(GMOCK_PP_CAT(_Macro, _N),(__VA_ARGS__))
// 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,