Boost Blueprint 141: Boost.OpenMethod BOOST_OPENMETHOD lets you write a free function that acts virtual in as many arguments as you want. It checks the real type of every argument and calls the most specific match. A version written for the base class handles everything else Methods live outside your classes. So you can add new behavior to a class hierarchy you don’t own, with no visitor and no changes to its code Each call is a table lookup that takes constant time, just like a virtual call Level up your C++ architecture. Follow @Boost_Libraries for the #BoostBlueprint series #cpp

Boost Blueprint 140: Boost.Hash2 The interface was proposed to the C++ committee in N3980, “Types Don’t Know #.” Boost shipped it Hash2 separates what you hash from how you hash it. Pick a specified algorithm (xxhash, FNV-1a, SipHash, SHA-2 and more) and feed it any type with hash_append Use fixed-width integer types with a fixed byte order flavor and the same struct produces the same hash on every compiler, OS and CPU. Safe for cache keys, content addressing and on-disk indexes SipHash with a random key adds hash flooding resistance, which std::hash never promised Level up your C++ architecture. Follow @Boost_Libraries for the #BoostBlueprint series #cpp