LOBYTE (0400): Overflow in constat expression

[kzelec...@e3tech.local]

1. What is "constat expression"?
2. The warning is bogus and quite disconcerting; you cannot tell actual
issues from fake ones.
I can live with the fact that ((BYTE) (0400)) produces a warning because it
is a cast and a narrowing cast is a bad thing; however, (LOBYTE (0400))
should not.
It works if I use (0400 & UCHAR_MAX) instead but LOBYTE is a Microsoft macro
and it should be useful as it is.

[jacob navia]

Le 23/04/13 10:58, kzelec...@e3tech.local a écrit :

The problem is that LOBYTE makes FIRST a cast to BYTE with

(BYTE) 0x400

This is wrong since the value doesn't fit into a byte (0-255) The
warning is correct. Then, the LOBYTE macro makes a & 0xff.

To avoid this warning do:

#undef LOBYTE
#define LOBYTE(x) (x&0xff)

[kzelec...@e3tech.local]

Wouldn’t it be more appropriate to fix LOBYTE in the header file than make
all clients do it separately?

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