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V770. Possible use of a left shift oper…
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

V770. Possible use of a left shift operator instead of a comparison operator.

Oct 20 2016

The analyzer detected a potential typo that deals with using operators '<<' and '<<=' instead of '<' and '<=', respectively, in a loop condition.

Consider the following example:

void Foo(std::vector<int> vec)
{
  for (size_t i = 0; i << vec.size(); i++) // <=
  {
    // Something
  }
}

The "i << vec.size()" expression evaluates to zero, which is obviously an error because the loop body will not execute even once. Fixed code:

void Foo(std::vector<int> vec)
{
  for (size_t i = 0; i < vec.size(); i++) 
  {
    // Something
  }
}

Note. Using right-shift operations (>>, >>=) is considered a normal situation, as they are used in various algorithms, for example computing the number of bits with the value 1, for example:

size_t num;
unsigned short var = N;
for (num = var & 1 ; var >>= 1; num += var & 1);

This diagnostic is classified as:

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