coroutine_error_handling.cpp

#include "sol.hpp"

#include <iostream>
#include <string>
using std::cout;
using std::endl;
using std::string;

int main()
{
  sol::state lua;
  string code = "unknown_func()";
  sol::coroutine co = lua.load(code);
  while(co)
  {
    cout << "C++ - Resuming coroutine" << endl;
    auto result = co();
    cout << "C++ Coroutine state: " << sol::to_string(co.status()) << std::endl;
    // how do I get the error string ?
    // answer:
    if(!result.valid())
      sol:error err = result;
      cout << "error: " << err.what() << endl
  }
}

$ g++ -std=c++14 coroutine_error_handling.cpp ext/liblua.a -I ext/lua-5.3.5/src -ldl
$ ./a.out
C++ - Resuming coroutine
C++ Coroutine state: runtime