The designated representative.

What this C++20 designated initializers question tests

This is a medium-difficulty question that probes your understanding of C++20's designated initializer syntax and its rules. It's the kind of language-specification question that appears in technical screens at firms hiring C++ developers, especially those building low-latency systems where precise language knowledge matters.

Designated initializers allow you to initialize aggregate members by name rather than position, improving code clarity and reducing initialization bugs. However, the feature comes with specific constraints: member initialization order, aggregate requirements, and syntax restrictions. This question tests whether you understand which declaration patterns violate those rules and why a compiler would reject them.

• Aggregate types and their properties in C++20
• Designated initializer syntax and ordering rules
• Compilation requirements for struct and class initialization