A small bug database

[bearophile]

The idea of creating a bug data base is interesting. This little 
data base collects only the bugs found by the PVS-Studio static 
analysis tool in Open Source projects:

http://www.viva64.com/en/examples/

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I have added some examples of bugs in my "Require 
parenthesization of ternary operator when compounded" enhancement 
request:

http://d.puremagic.com/issues/show_bug.cgi?id=8757

This is a common enough bug, worth avoiding with a change in D 
design (but it's a small breaking change).

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>The return value of function 'xxxxx' is required to be utilized:<

http://www.viva64.com/en/examples-V530/

In D there are several Phobos functions like empty() that have no 
side effects, so ignoring their return value is sometimes a bug.

In GNU-C there is a function attribute named "warn_unused_result":

http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html

In D a @warn_unused_result is maybe handy for functions like 
empty().

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http://www.viva64.com/en/examples-V564/


It's mostly about the (!x & y) bug pattern, that is not yet 
forbidden in D:
http://d.puremagic.com/issues/show_bug.cgi?id=5409

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http://www.viva64.com/en/examples-V588/

This is about the "=+" and "=-" bug patterns. Not very common but 
easy to spot.

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Bye,
bearophile