Changeset 9396 in vbox

Timestamp:

Jun 4, 2008 5:47:52 PM (17 years ago)

Author:

vboxsync

svn:sync-xref-src-repo-rev:

31629

Message:

type promotion warning for 64-bit. (Hope it's correctly formulated.)

File:

trunk/doc/VBox-CodingGuidelines.cpp

-              r8155
+              r9396
  *      - Take care and use size_t when you have to, esp. when passing a pointer
  *        to a size_t as a parameter.
+ *
+ *      - Be wary of type promotion to (signed) integer. For example the
+ *        following will cause u8 to be promoted to int in the shift, and then
+ *        sign extended in the assignment 64-bit:
+ *        @code
+ *              uint8_t u8 = 0xfe;
+ *              uint64_t u64 = u8 << 24;
+ *              // u64 == 0xfffffffffe000000
+ *        @endcode
+ *
+ *

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