Adding more information to exceptions

[Lubos Pintes]

Maybe I don't understand this example fully, but where is a "try" statement?
The to!int may throw...
Dňa 29. 1. 2013 22:53 Ali Çehreli  wrote / napísal(a):
> On 01/29/2013 12:32 PM, Vladimir Panteleev wrote:
>
>  > I would like to add some information to any exceptions thrown inside the
>  > loop's body (e.g. whatever std.conv.to may throw), in our case the line
>  > number.
>
> Here is a RAII idea that takes advantage of exception chaining without
> directly using the 'next' parameter. It constructs a LineInfo object
> ready to throw in its destructor unless specifically told that it is not
> necessary anymore.
>
> import std.stdio;
> import std.string;
> import std.conv;
>
> void main()
> {
>      auto lines = [ "42", "100", "hello" ];
>
>      int[] numbers;
>
>      struct LineInfo
>      {
>          size_t lineNumber;
>          bool allIsGood = false;
>
>          ~this()
>          {
>              if (!allIsGood) {
>                  throw new Exception(format("Line number: %s",
> lineNumber));
>              }
>          }
>      }
>
>      foreach (lineNumber, line; lines) {
>          auto info = LineInfo(lineNumber);
>          numbers ~= to!int(line);
>          info.allIsGood = true;
>      }
> }
>
> Ali
>