clang tidy pro type member init resharper

Question

I've got some code parsing json like so:

  QJsonParseError errors;
  auto doc = QJsonDocument::fromJson(myJson.toUtf8(), &errors);

Resharper's clang tidy suggestions flags that QJsonParseError errors is an 'uninitialized record type'

The suggested fix is to zero initialize the variable via {} for C++11. The autofix offered by resharper, puts in some brackets like: QJsonParseError errors{};

What does that actually mean/do?

score 1 · Accepted Answer · answered Apr 17 '18 at 16:32

Zero initialization guarantees that the members of a class/struct are zero initialized. For example -

struct student
{
    int idNo;
    char name[20];
};

So, if object of student is zero-initialized, then it is guaranteed that the member variables idNo, name value(s) are initialized with zeroes (i.e., idNo = 0 and name array filled with zeroes).

In your case, QJsonParseError members are zero initialized rather than filling with some random values during object initialization.

clang tidy pro type member init resharper

1 Answers1