A C++ developer demonstrates how comparing a std::string_view with a std::string can produce unexpected results when compiled with optimization flags like -O2. The article frames the bug humorously as 'spooky' behavior, but explains it's actually due to std::string_view not being null-terminated, causing length-dependent comparison differences between optimized and unoptimized builds.
Background
std::string_view, introduced in C++17, is a non-owning reference to a character sequence that does not guarantee null-termination. Comparisons between string_view and string can yield surprising results when optimizations expose underlying buffer length differences.
- Source
- Lobsters
- Published
- Nov 2, 2026 at 02:17 AM
- Score
- 5.0 / 10