Re: Why is size_t unsigned?

[Maxim Fomin]

On Monday, 22 July 2013 at 15:04:25 UTC, monarch_dodra wrote:

On Monday, 22 July 2013 at 12:51:31 UTC, Andrej Mitrovic wrote:

On 7/22/13, JS <js.m...@gmail.com> wrote:

foreach doesn't allow you to modify the index to skip over
elements.

It does:

-----
import std.stdio;

void main()
{
   int[] x = [1, 2, 3, 4, 5];
   foreach (ref i; 0 .. 5)
   {
       writeln(x[i]);
       ++i;
   }
}
-----

Writes:
1
3
5

99% sure that's unspecified behavior. I wouldn't rely on anything like that.

Of course it is specified behavior.

ForeachStatement:
    Foreach (ForeachTypeList ; Aggregate) NoScopeNonEmptyStatement

Foreach:
    foreach
    foreach_reverse

ForeachTypeList:
    ForeachType
    ForeachType , ForeachTypeList

ForeachType:
    refopt BasicType Declarator
    refopt Identifier

Aggregate:
    Expression

This is an example of unspecified behavior:

import std.stdio;

void main()
{
    int[] x = [1, 2, 3, 4, 5];
    foreach (ref i; 0 .. 5)
    {
        __limit1631--;
        writeln(x[i]);
    }
}