This is (should be) the exact equivalent of the Cilia code in C++:

• Types
  • int, int32_t, int64_t, float
• Variables
  • int x = 42;
  • auto x = 42;
  • const auto x = 42;
  • vector<string> words;
  • set<string> names;
  • map<string, ContactInfo> contactInfoForID;
• Functions
  • auto multiply(int a, int b) -> int { return a * b; }
  • auto print(const ContactInfo& a) { ...; }
  • auto concat(const string_view a, const string_view b) -> string { return ...; }
• Loops
  • for (int i = 1; i <= 10; ++i) { ...; }
  • for (int i = 0; i < words.ssize(); ++i) { ...; }
  • for (int i : {5, 7, 11, 13}) { ...; }
  • for (const auto& word : words) { ... }

In C++ int and 42 are 32 bit wide, not 64 bit.
That’s Ok, this is a syntax comparison, not a performance benchmark.