How to use "read_bool"?

[simendsjo]

On Sat, 04 Aug 2012 03:01:31 +0200, Zeh <zecacu at yahoo.com.br> wrote:

> Thanks for the help, but i tryed both solutions posted and still not  
> working. :/
>
> I get erros to compile the code posted by simendsjo. I try modify at my  
> own, but without success. The code suggest by Timon Gehr compiles, but  
> not work.
>
> Honestly speaking, i didn't have enough knowledge to understand the  
> solutions offered (yet). What is the smallest way to use the "read_bool"?
>
>
> Besides, one version of that tutorial in portuguese would be great =D


This works:
import std.stdio, std.string, std.conv;

bool read_bool(in string message) {
     while(true) {
         write(message, " (false or true): ");
         string input;
         do {
             input = readln().chomp();
         } while(!input.length);
         writeln("INPUT: '", input, "'");

         try
             return input.to!bool();
         catch {}
     }
}

void main() {
     write("How many are we? ");
     int personCount;
     readf(" %s", &personCount);

     write("How many bicycles are there? ");
     int bicycleCount;
     readf(" %s", &bicycleCount);

     write("What is the distance to the beach? ");
     int distance;
     readf(" %s", &distance);

     bool existsCar = read_bool("Is there a car? ");
     bool existsLicense =
         read_bool("Is there a driver license? ");
}


$ rdmd read_bool
How many are we? 10
How many bicycles are there? 1
What is the distance to the beach? 2
Is there a car?  (false or true): true
Is there a driver license?  (false or true): false