[Bug python/14386] std::bitset not iterable

["andreasheimberger at gmx dot at" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=14386

--- Comment #2 from andreasheimberger at gmx dot at 2012-07-31 21:27:42 UTC ---
g++ (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3
GNU gdb (Ubuntu/Linaro 7.4-2012.04-0ubuntu2) 7.4-2012.04
STL Support Implementation -> http://sourceware.org/gdb/wiki/STLSupport

--------------------------------------------------------------------------------
That should be your printer implementation
--------------------------------------------------------------------------------
class StdBitsetPrinter:
    "Print a std::bitset"

    def __init__(self, typename, val):
        self.typename = typename
        self.val = val

    def to_string (self):
        # If template_argument handled values, we could print the
        # size.  Or we could use a regexp on the type.
        return '%s' % (self.typename)

    def children (self):
        words = self.val['_M_w']
        wtype = words.type

        # The _M_w member can be either an unsigned long, or an
        # array.  This depends on the template specialization used.
        # If it is a single long, convert to a single element list.
        if wtype.code == gdb.TYPE_CODE_ARRAY:
            tsize = wtype.target ().sizeof
        else:
            words = [words]
            tsize = wtype.sizeof 

        nwords = wtype.sizeof / tsize
        result = []
        byte = 0
        while byte < nwords:
            w = words[byte]
            bit = 0
            while w != 0:
                if (w & 1) != 0:
                    # Another spot where we could use 'set'?
                    result.append(('[%d]' % (byte * tsize * 8 + bit), 1))
                bit = bit + 1
                w = w >> 1
            byte = byte + 1
        return result

--------------------------------------------------------------------------------
 That's my source file
--------------------------------------------------------------------------------
#include <bitset>

int main()
{
    const int bitsetsize = 8;
    std::bitset<bitsetsize> bits;
    for(int i = 0; i < bitsetsize; i++) {
        if(i%2 == 0 || i == 0) {bits[i].flip(); }
    }

    return 0;
}

--------------------------------------------------------------------------------
 My Debug Commands
--------------------------------------------------------------------------------
-enable-pretty-printing
-break-insert 10
-exec-run
-var-create - * bits


Thanks for your reply

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