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V3092. Range intersections are possible…
Analyzer diagnostics
General Analysis (C++)
General Analysis (C#)
General Analysis (Java)
Diagnosis of micro-optimizations (C++)
Diagnosis of 64-bit errors (Viva64, C++)
MISRA errors
AUTOSAR errors
Additional information
Contents

V3092. Range intersections are possible within conditional expressions.

May 05 2016

The analyzer has detected a potential error in a condition. The program must perform different actions depending on which range of values a certain variable meets.

For this purpose, the following construct is used in the code:

if ( MIN_A < X && X < MAX_A ) {
  ....
} else if ( MIN_B < X && X < MAX_B ) {
  ....
}

The analyzer generates the warning when the ranges checked in conditions overlap. For example:

if ( 0 <= X && X < 10)
  FooA();
else if ( 10 <= X && X < 20)
  FooB();
else if ( 20 <= X && X < 300)
  FooC();
else if ( 30 <= X && X < 40)
  FooD();

The code contains a typo. The programmer's fingers faltered at some moment and he wrote "20 <= X && X < 300" instead of "20 <= X && X < 30" by mistake. If the X variable stores, for example, the value 35, it will be the function FooC() that will be called instead of FooD().

The fixed code:

if ( 0 <= X && X < 10)
  FooA();
else if ( 10 <= X && X < 20)
  FooB();
else if ( 20 <= X && X < 30)
  FooC();
else if ( 30 <= X && X < 40)
  FooD();

This diagnostic is classified as:

You can look at examples of errors detected by the V3092 diagnostic.

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