C++26 introduces a standardized <debugging> header with three noexcept functions: std::breakpoint(), std::is_debugger_present(), and std::breakpoint_if_debugging(). This eliminates the need for platform-specific macros like __debugbreak() or inline assembly. The header is freestanding and replaceable, allowing custom implementations on bare-metal systems. std::breakpoint() triggers a debugger halt if attached, otherwise behaves implementation-defined (e.g., SIGTRAP). std::is_debugger_present() checks for active debugger attachment in real time, with platform-specific implementations (e.g., Windows API or /proc/self/status on Linux).
Its replaceability enables use in freestanding environments. std::breakpoint_if_debugging() combines both for conditional breakpoints, mirroring patterns used in Boost. Test, Catch2, Dear ImGui, and Unreal Engine. The feature standardizes a long-standing wheel-reinvention across C++ projects, simplifying cross-platform debugging tooling.
Source: Hacker News · Summarized by HeadlinesBriefing