memset, malloc

• 只是 set

• std::memset

• https://en.cppreference.com/w/cpp/string/byte/memset

• c++ memset

• https://www.runoob.com/cprogramming/c-function-memset.html

• 才有 alloc

• malloc

• https://en.cppreference.com/w/c/memory/malloc

• https://shengyu7697.github.io/cpp-malloc/

• calloc

• https://en.cppreference.com/w/c/memory/calloc

• calloc, malloc, realloc / free

• https://openhome.cc/Gossip/CGossip/MallocFree.html