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digitalmars.D.bugs - [Issue 2695] New: pure functions can invoke impure function pointers

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=2695

           Summary: pure functions can invoke impure function pointers
           Product: D
           Version: 2.025
          Platform: PC
        OS/Version: Windows
            Status: NEW
          Keywords: accepts-invalid
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: bugzilla digitalmars.com
        ReportedBy: clugdbug yahoo.com.au


This compiles, and it shouldn't. Interestingly, if you replace 'pure' with
'nothrow', the code is correctly rejected.
--------
static int nasty;
int impure_evil_function(int x)
{
    nasty++;
    return nasty;
}

pure int foo(int x)
{
    int function(int) a = &impure_evil_function;
    return a(x);
}
--------


-- 
Feb 27 2009
next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=2695





------- Comment #1 from clugdbug yahoo.com.au  2009-04-22 03:30 -------
Created an attachment (id=334)
 --> (http://d.puremagic.com/issues/attachment.cgi?id=334&action=view)
Patch for DMD2.029.

This patch also prevents pure functions from calling impure delegates.

It (correctly) does not prevent them from assigning to impure function
pointers/delegates -- it just mustn't call them. I've tested it with
delegates/functions passed as parameters, as well as defined as variables; I've
also tested it with template functions, and with structs defining opCall, and
made sure it doesn't cause problems with variables defined in module scope.


-- 
Apr 22 2009
prev sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=2695


Don <clugdbug yahoo.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED




--- Comment #2 from Don <clugdbug yahoo.com.au>  2009-05-14 01:28:05 PDT ---
Fixed DMD2.030

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May 14 2009