It's weak, but how big is it?

Understanding memory layout and size calculation in C++

This is a medium-difficulty C++ question that tests your grasp of data structure memory layout, alignment rules, and size computation on 64-bit systems. It requires you to reason about how the compiler packs members into memory, accounting for padding and alignment constraints.

To solve problems like this, you need to understand how the C++ standard defines object layout: the order of member declaration, the size and alignment requirements of each type, and how the compiler inserts padding to satisfy alignment guarantees. On 64-bit architectures, alignment rules often differ from 32-bit systems, and this gap is a common source of mistakes.

• Member alignment and padding insertion
• sizeof() for struct and class types
• Alignment requirements for fundamental types (char, int, pointer, etc.)
• Impact of member declaration order on total object size