Sub menu example in README segmentation fault

[lu-maca]

Hi,

I'm having some trouble with the example in README. This compiles correctly but gives a segfault when executed.

#include "cli/cli.h"
#include "cli/clifilesession.h"

using namespace cli;
using namespace std;

int main() {
  // setup cli

  auto rootMenu = make_unique<Menu>("myprompt");

  auto menuA = make_unique<Menu>("a_prompt");
  rootMenu->Insert(std::move(menuA));

  auto menuAA = make_unique<Menu>("aa_prompt");
  menuA->Insert(std::move(menuAA));

  auto menuAB = make_unique<Menu>("ab_prompt");
  menuA->Insert(std::move(menuAB));

  auto menuAC = make_unique<Menu>("ac_prompt");
  menuA->Insert(std::move(menuAC));

  auto menuACA = make_unique<Menu>("aca_prompt");
  menuAC->Insert(std::move(menuACA));

  auto menuB = make_unique<Menu>("b_prompt");
  rootMenu->Insert(std::move(menuB));

  auto menuBA = make_unique<Menu>("ba_prompt");
  menuB->Insert(std::move(menuBA));

  auto menuBB = make_unique<Menu>("bb_prompt");
  menuB->Insert(std::move(menuBB));

  Cli cli(std::move(rootMenu));
  // global exit action
  cli.ExitAction(
      [](auto &out) { out << "Goodbye and thanks for all the fish.\n"; });

  CliFileSession input(cli);
  input.Start();

  return 0;
}

A way of making it work is the following:

int main() {
  // setup cli

  auto rootMenu = make_unique<Menu>("myprompt");

  auto menuA = make_unique<Menu>("a_prompt");
  auto menuAA = make_unique<Menu>("aa_prompt");
  auto menuAB = make_unique<Menu>("ab_prompt");
  auto menuAC = make_unique<Menu>("ac_prompt");
  auto menuACA = make_unique<Menu>("aca_prompt");

  auto menuB = make_unique<Menu>("b_prompt");
  auto menuBA = make_unique<Menu>("ba_prompt");
  auto menuBB = make_unique<Menu>("bb_prompt");
  
  menuAC->Insert(std::move(menuACA));
  
  menuB->Insert(std::move(menuBB));
  menuB->Insert(std::move(menuBA));

  menuA->Insert(std::move(menuAA));
  menuA->Insert(std::move(menuAB));
  menuA->Insert(std::move(menuAC));

  rootMenu->Insert(std::move(menuA));
  rootMenu->Insert(std::move(menuB));

  Cli cli(std::move(rootMenu));
  // global exit action
  cli.ExitAction(
      [](auto &out) { out << "Goodbye and thanks for all the fish.\n"; });

  CliFileSession input(cli);
  input.Start();

  return 0;
}

I'm not sure why, unfortunately I don't have much time to study the problem. Hope this can help.

Thanks for you work,
Luca