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preprocessor.bas
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preprocessor.bas
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''
'' Defines/macros can be used for compile-time text replacement:
''
#define number 123
print number
#define foo( x ) print x, x
foo( number )
#macro bar( x )
for i as integer = 0 to 3
foo( x )
next
#endmacro
bar( number )
#define myMin( a, b ) iif( a <= b, a, b )
#define myMax( a, b ) iif( a >= b, a, b )
randomize( timer( ) )
dim as integer x = rnd( ) * 100
dim as integer y = rnd( ) * 100
print "min( "; x; ", "; y; " ) ="; myMin( x, y )
print "max( "; x; ", "; y; " ) ="; myMax( x, y )
''
'' Some common #defines:
''
#define TRUE (-1)
#define FALSE 0
#define NULL cast(any ptr, 0)
''
'' #if provides a way to conditionally compile code:
''
#if defined( __FB_WIN32__ )
print "compiled for Windows"
#elseif defined( __FB_LINUX__ )
print "compiled for Linux"
#elseif defined( __FB_DOS__ )
print "compiled for DOS"
#endif
#define ENABLE_FOO
#ifdef ENABLE_FOO
print "foo was enabled at compile time!"
#endif
#if 1 + 1 = 2
#print "yes, 1 + 1 = 2"
#endif
#if 0
this text will be skipped, as if it was commented out
#endif
#define MY_DEBUG_MODE
#ifdef MY_DEBUG_MODE
#define myassert( condition ) _
if (condition) = 0 then : _
print "my example error at " & __FILE__ & "(" & __LINE__ & "): " & #condition : _
end if
#else
#define myassert( condition )
#endif
myassert( 1 = 1 )
myassert( 2 = 2 )
myassert( 1 = 2 )
sleep