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V6021. The value is assigned to the 'x' variable but is not used.
This diagnostic rule detects only cases when incorrect value is assigned to a variable which is reassigned with a new value or is not used at all.
Case 1.
One and the same variable is assigned a value twice. In addition, the variable itself is not used between these assignments.
Consider this example:
A = GetA();
A = GetB();The 'A' variable being assigned values twice might indicate a bug. The code should have most probably looked like this:
A = GetA();
B = GetB();Cases when the variable is used between the assignments are treated as correct and do not trigger the warning:
A = 1;
A = Foo(A);Case 2.
Local variable is assigned a value, but the variable is not used further anywhere until the exit of the method.
Consider the following example:
String GetDisplayName(Titles titles, String name)
{
String result = null;
String tmp = normalize(name);
if (titles.isValidName(name, tmp)){
result = name;
}
return name;
}The programmer wanted the method to return the 'result' variable, which gets initialized depending on how 'isValidName' executes, but made a typo that causes the method to return the variable 'name' all the time. The fixed code should look like this:
String GetDisplayName(Titles titles, String name)
{
String result = null;
String tmp = normalize(name);
if (titles.isValidName(name, tmp)){
result = name;
}
return result;
}This diagnostic is classified as:
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You can look at examples of errors detected by the V6021 diagnostic. |
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