• d-bugmail puremagic.com (43/43) Aug 24 2010 http://d.puremagic.com/issues/show_bug.cgi?id=4722

d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=4722

           Summary: Debug Phobos lib
           Product: D
           Version: D2
          Platform: All
        OS/Version: Windows
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: bearophile_hugs eml.cc



This is one example from Phobos, a small part of std.bitmanip.BitArray:


    void init(void[] v, size_t numbits)
    in
    {
        assert(numbits <= v.length * 8);
        assert((v.length & 3) == 0);
    }
    body
    {
        ptr = cast(uint*)v.ptr;
        len = numbits;
    }



But if you compile (with no compilation arguments but the file name) this wrong
program runs, with no runtime errors:


import std.bitmanip: BitArray;
void main() {
    ubyte[4] data;
    BitArray bits;
    bits.init(data, 100);
}


The problem is real, but I don't know if the following suggestion is stupid or
impossible. 

The idea is to have two precompiled libs, like phobos.lib and phobos_debug.lib
(where the debug one contains the asserts too), and DMD (or rmdm) may pick
phobos.lib if the -release switch is used, and use phobos_debug.lib otherwise.
This may allow to replace the enforce() in Phobos with normal asserts inside
DbC contracts.

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