g++ -std=c++11 -Wall -Wextra `pkg-config ruby-2.1 --cflags --libs` fizzbuzz.cc

fizzbuzz.cc

#include <iostream>
#include <ruby.h>

auto main() -> int {
  ruby_init();
  ruby_init_loadpath();

  int status;
  rb_eval_string_protect(R"(
    1.upto(100) do |x|
      puts "#{x} : #{
        x % 15 == 0 ? " fizzbuzz"
          : x % 5 == 0 ? " buzz"
          : x % 3 == 0 ? " fizz"
          : ''
        }"
    end
  )", &status);

  ruby_finalize();

  return status;
}