Re: [boost] Proposal: Monotonic Containers

Subject: Re: [boost] Proposal: Monotonic Containers
From: Christian Schladetsch (christian.schladetsch_at_[hidden])
Date: 2009-06-09 21:22:01

Hello,

The initial (and only, AFAIK) problem with the given proposal was that the
following code asserted:

    boost::monotonic::inline_storage<100*sizeof(int)> storage1;   // create
local storage on the stack
    boost::monotonic::vector<int> deathrow(storage1);   // create a
std::vector that uses this storage

    for(int i = 0; i < 100; ++i)
        deathrow.push_back(i);

I offered to get back to the list when I had looked at it. I am doing so
now. The `problem` is that std::vector allocates more than it needs, as you
add to it. So while it may seem fine to allocate space for 100 ints, then
make a monotonic::vector<int> and add 100 ints to it, it will fail to
allocate the required excessively sized buffer.

The `fix` in this case is to simply give it a larger buffer. This has no
impact on the utility of the proposed librrary.

Regards,
Christian.