Create a vector of vectors, the inner vectors contain strings

cpsc120_2D_vector.cpp

// Gist https://gist.github.com/mshafae/eb239941e0171dcf564d91a3f75c64a7
// Filename cpsc120_2D_vector.cpp
// CompileCommand clang++ -std=c++17 cpsc120_2D_vector.cpp 
// Create a vector of vectors, the inner vectors contain strings
// Note that C++ is row major order.

#include <iostream>
#include <string>
#include <vector>

int main(int argc, char const *argv[]) {
  std::vector<std::string> arguments{argv, argv + argc};
  // Vectors are row major order like a movie theater. This means the first
  // index is the row and the second index is the column (or seat). All the
  // types must be the same in an vector. This is a declaration for a 2 x 3
  // vector - 2 rows, 3 columns. Notice the double braces.
  // The table below looks like this:
  // | "Pastrami on Rye" | "Hot Dog" | "Burrito" |
  // | "YES"             | "YES"     | "NO"      |
  std::vector<std::vector<std::string>> sandwiches{
    {"Pastrami on Rye", "Hot Dog", "Burrito"}, {"YES", "YES", "NO"}
  };
  if (arguments.size() < 2) {
    std::cout << "Please provide a sandwich name on the command line.\n";
    std::cout << "For example: ./a.out \"Pastrami on Rye\"\n";
    std::cout << "Exiting.\n";
    return 1;
  }
  int index{0};
  bool was_found{false};
  // Search for the sandwich passed on the command line
  // row 0 has the sandwich names
  // Instead of this
  // std::vector<std::string> row = sandwiches.at(0);
  // You can use auto
  auto row = sandwiches.at(0);
  // The compiler can deduce that element is a std::string
  for (const auto& element : row) {
    if (element == arguments.at(1)) {
      was_found = true;
      break;
    }
    index += 1;
  }
  // If the second row is "YES" then it is a sandwich, else it is not a
  // sandwich.
  bool is_sandwich{false};
  if (was_found) {
    is_sandwich = (sandwiches.at(1).at(index) == "YES");
  }
  if (was_found && is_sandwich) {
    std::cout << sandwiches.at(0).at(index) << " is considered a sandwich.\n";
  } else if (was_found && !is_sandwich) {
    std::cout << sandwiches.at(0).at(index)
              << " is NOT considered a sandwich.\n";
  } else {
    std::cout << "Sorry, I don't know about \"" << arguments.at(1) << "\"\n";
    std::cout << "I can't tell you if it is a sandwich or not.\n";
    std::cout << "Exiting.\n";
    return 1;
  }
  return 0;
}