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V3162. Suspicious return of an always e…
Analyzer diagnostics
General Analysis (C++)
General Analysis (C#)
General Analysis (Java)
Diagnosis of micro-optimizations (C++)
Diagnosis of 64-bit errors (Viva64, C++)
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Additional information
Contents

V3162. Suspicious return of an always empty collection.

Sep 30 2020

The analyzer has detected a 'return' statement that always returns an empty collection declared as a local variable. This typically happens when the programmer forgets to add elements to the collection.

Consider the following example:

List<string> CreateDataList()
{
  List<string> list = new List<string>();
  string data = DoSomething();
  return list;
}

The programmer forgot to add the 'data' element to 'list', so the method will always return an empty collection. Here is the fixed version:

List<string> CreateDataList()
{
  List<string> list = new List<string>();
  string data = DoSomething();
  list.Add(data);
  return list;
}

Sometimes developers will write a method that does nothing more than simply create and return a collection, for example:

List<List<CustomClass>> CreateEmptyDataList()
{
  var list = new List<List<CustomClass>>();
  return list;
}

Another example:

List<List<CustomClass>> CreateEmptyDataList()
{
  return new List<List<CustomClass>>();
}

This technique is used in certain programming patterns or when the type of the collection has a very long name. The analyzer can recognize such situations and ignore them.

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