Quick Answer

Potential bugs from comparing different integer types

Understanding the Issue

This warning alerts about comparisons between signed and unsigned integers, which can lead to unexpected behavior due to implicit type conversions.

The Problem

This code demonstrates the issue:

Cpp Error 
// Problem: Mixed comparison
int i = -1;
unsigned u = 10;
if (i < u) { // Always true!
    // Unexpected behavior
}

The Solution

Here's the corrected code:

Cpp Fixed 
// Solution 1: Make types consistent
if (static_cast<unsigned>(i) < u) { /*...*/ }

// Solution 2: Use same signedness
size_t i = 10; // unsigned
size_t u = 20;

Key Takeaways

Keep integer types consistent in comparisons to avoid subtle bugs.