Truncation behavior of duration_cast

Understanding truncation in C++ duration_cast

This is an easy C++ language-knowledge question that tests your grasp of how std::chrono::duration_cast handles conversions between different time units. It's a straightforward concept that appears in systems programming and low-latency finance, where precision in time measurement matters.

The question probes whether you understand that duration_cast truncates rather than rounds when converting between incommensurable time units. Getting this right requires knowing the exact semantics of the standard library function—a detail that surfaces quickly in real code but trips up candidates who haven't worked with chrono carefully.

• Duration representation and ratio templates
• Implicit vs. explicit type conversion in chrono
• Truncation vs. rounding behaviour