// tag
#modules
2 posts tagged #modules.
C++ modules in 2026: import std works, import boost is coming, your IDE still can't
import std compiles on GCC 16.1, Clang 18+, and MSVC. Boost has a per-library module prototype showing 45% build-time reductions. But CMake support is still experimental, clangd needs a full rebuild on module changes, IntelliSense has been 'experimental' for seven years, and almost no libraries ship module definitions. For reflection users: PCH is faster than modules on GCC 16.1 today.
The hidden cost of <meta> -- and the three-line fix
Vittorio Romeo measured what C++26 reflection actually costs: the <meta> header adds ~181ms per TU on GCC 16.1, but the reflection algorithm itself is ~0.07ms per enumerator. The header is 2500x more expensive than the logic. A three-line CMake PCH stanza cuts the header cost by 2.3x. Modules, surprisingly, make it worse.