How do I approach Software Engineering Fundamentals interview questions?

Software Engineering Fundamentals questions require understanding of core concepts and practice. PracHub provides solutions with explanations to help you master software engineering fundamentals interviews.

What difficulty level is this interview question?

This is a medium difficulty Software Engineering Fundamentals question, commonly asked during Technical Screen rounds at PayPal.

What role is this question designed for?

This question is commonly asked for Software Engineer candidates at PayPal during technical interviews.

Detect memory leaks in C++

Last updated: Mar 29, 2026

Quick Overview

This question evaluates understanding of memory management and leak detection in C++, including competence with dynamic analysis tools, runtime/reporting integration, and preventive ownership and resource-management techniques.

PayPal

Aug 7, 2025, 12:00 AM

Software Engineer

Technical Screen

Software Engineering Fundamentals

C++ Memory Leaks: Detection, Integration, and Prevention

You are building or maintaining a C++ service/library and need a practical approach to find and prevent memory leaks across platforms.

Discuss:

Dynamic analysis tools and options
- Linux: Valgrind/Memcheck; AddressSanitizer (ASan) and LeakSanitizer (LSan)
- Windows: Visual Studio AddressSanitizer, CRT debug heap, Diagnostic Tools
- macOS/iOS: Xcode Instruments (Leaks/Allocations), command-line leaks
Runtime/reporting integration
- How to run these tools in local dev, test, and CI
- How to fail builds/tests on leaks
- Using suppressions and mid-run leak checks
Preventive techniques
- RAII
- Smart pointers (unique_ptr/shared_ptr/weak_ptr)
- Ownership rules and coding practices

Solution

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