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b3381269d7
Aka 'intmax_t', as recommended by newer standards.
For example
if (-0x80000000 < 0) is false,
but
#if (-0x80000000 < 0) is true
because in C, 0x80000000 is an unsigned int, Whereas in
a preprocessor expression, it is a signed long long, even
without LL suffix.
63 lines
876 B
C
63 lines
876 B
C
/* accept 'defined' as result of substitution */
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----- 1 ------
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#define AAA 2
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#define BBB
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#define CCC (defined ( AAA ) && AAA > 1 && !defined BBB)
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#if !CCC
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OK
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#else
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NOT OK
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#endif
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----- 2 ------
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#undef BBB
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#if CCC
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OK
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#else
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NOT OK
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#endif
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----- 3 ------
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#define DEFINED defined
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#define DDD (DEFINED ( AAA ) && AAA > 1 && !DEFINED BBB)
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#if (DDD)
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OK
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#else
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NOT OK
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#endif
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----- 4 ------
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#undef AAA
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#if !(DDD)
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OK
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#else
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NOT OK
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#endif
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----- 5 ------
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line __LINE__
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#define __LINE__ # ## #
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line __LINE__
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----- 10 ------
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/* preprocessor numbers are (u)intmax_t */
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#if -2147483648 < 0
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1 true
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#endif
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#if -0x80000000 < 0
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2 true
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#endif
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#if -9223372036854775808U > 0
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3 true
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#endif
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#if -0x8000000000000000 > 0 // unsigned by overflow
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4 true
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#endif
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#if 1 << 31 > 2 && 1 << 32 > 2 && 1 << 63 < 2 && 1U << 63 > 2
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5 true
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#endif
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#if (1<<29) * 11 >= 1<<32 && defined DDD << 63 < 0
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6 true
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#endif
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