weighted_letter_gen_2.cpp

std::string vowels = "aeiouy";
std::string consonants = "bcdfghjklmnpqrstvwxyz";

auto vowels_gen = choice_gen(vowels);
auto consonant_gen = choice_gen(consonants);

auto weighted_letters_gen = weighted_one_of_gen(
  [](char c) { return c; },
  weighted(vowels_gen, 2),
  weighted(consonant_gen, 1));