Adding more information to exceptions
Jesse Phillips
Jessekphillips+D at gmail.com
Wed Jan 30 12:05:38 PST 2013
On Tuesday, 29 January 2013 at 21:53:46 UTC, Ali Çehreli wrote:
> 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
umm, so why can't using next directly be valid?
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