46 lines
641 B
Markdown
46 lines
641 B
Markdown
### Compiling
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$ cpp -P file > outfile
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### Includes
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#include "file"
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### Defines
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#define FOO
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#define FOO "hello"
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#undef FOO
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### If
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#ifdef DEBUG
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console.log('hi');
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#elif defined VERBOSE
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...
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#else
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...
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#endif
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### Error
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#if VERSION == 2.0
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#error Unsupported
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#warning Not really supported
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#endif
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### Macro
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#define DEG(x) ((x) * 57.29)
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### Token concat
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#define DST(name) name##_s name##_t
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DST(object); #=> "object_s object_t;"
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### file and line
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#define LOG(msg) console.log(__FILE__, __LINE__, msg)
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#=> console.log("file.txt", 3, "hey")
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