Alessandro Bonazzi
e075990ed3
Files correlati : Commento : Aggiunto il preprocessore c++ mcpp per sostituire il compilatore nella compilazione delle maschere.
43 lines
1.2 KiB
C
43 lines
1.2 KiB
C
/* n_25.c: Macro arguments are pre-expanded (unless the argument is an
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operand of # or ## operator) separately, that is, are macro-replaced
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completely prior to rescanning. */
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#include "defs.h"
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#define ZERO_TOKEN
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#define MACRO_0 0
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#define MACRO_1 1
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#define TWO_ARGS a,b
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#define sub( x, y) (x - y)
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#define glue( a, b) a ## b
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#define xglue( a, b) glue( a, b)
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#define str( a) # a
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main( void)
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{
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int a = 1, b = 2, abc = 3, MACRO_0MACRO_1 = 2;
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fputs( "started\n", stderr);
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/* 25.1: "TWO_ARGS" is read as one argument to "sub", then expanded to
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"a,b", then "x" is substituted by "a,b". */
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assert( sub( TWO_ARGS, 1) == 1);
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/* 25.2: An argument pre-expanded to 0-token. */
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/* ( - 1); */
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assert( sub( ZERO_TOKEN, a) == -1);
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/* 25.3: "glue( a, b)" is pre-expanded. */
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assert( xglue( glue( a, b), c) == 3);
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/* 25.4: Operands of ## operator are not pre-expanded. */
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assert( glue( MACRO_0, MACRO_1) == 2);
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/* 25.5: Operand of # operator is not pre-expanded. */
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assert( strcmp( str( ZERO_TOKEN), "ZERO_TOKEN") == 0);
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fputs( "success\n", stderr);
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return 0;
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}
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