[clazy] [Bug 389056] New: suggest using initializer lists

[Milian Wolff]

https://bugs.kde.org/show_bug.cgi?id=389056

            Bug ID: 389056
           Summary: suggest using initializer lists
           Product: clazy
           Version: unspecified
          Platform: Other
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: mail at milianw.de
                CC: smartins at kde.org
  Target Milestone: ---

I often come across code like this which is bad, from a performance POV:

```
QVector<Type> l1 = ...;
QVector<Type> l2 = ...;
foreach(const auto& item : l1 + l2) { ... }
```

Instead, it would be faster to use a lambda or a nested loop to get rid of the
temporary allocation. E.g.:

```
QVector<Type> l1 = ...;
QVector<Type> l2 = ...;
for (const auto& list : {l1, l2}) {
    for (const auto& item : list) { ... }
}
```

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