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Avoiding overflow boost container


Avoiding overflow boost container

By : justas.v
Date : November 23 2020, 04:01 AM
To fix this issue Note that std::size_t(-1) / pool_block is the largest std::size_t value which, when multiplied by pool_block, will not overflow a std::size_t. (Because std::size_t is unsigned, and because of how signed-to-unsigned integer conversions work, std::size_t(-1) is the largest representable std::size_t value, i.e., equivalent to std::numeric_limits::max() but a little shorter to type.)
I suspect the intent is to restrict blocks_per_chunk to values that won't cause overflows in subsequent math operations using this variable. Indeed, the following code comes right after:
code :
//Minimum block size is at least max_align, so all pools allocate sizes that are multiple of max_align,
//meaning that all blocks are max_align-aligned.
char *p = static_cast<char *>(block_slist_base_t::allocate(blocks_per_chunk*pool_block, mr));


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Is it possible to have a popup div that 'breaks out' of an overflow:scroll or overflow:auto container?

Is it possible to have a popup div that 'breaks out' of an overflow:scroll or overflow:auto container?


By : Bernardo Pinto
Date : March 29 2020, 07:55 AM
it helps some times I'd say that it's not possible to do that without using JS to calculate the position of the link and then display the popup with a position:fixed..
The problem is that your popup is inside a div with overflow:auto and everything inside that div will affect the scroll, so to show the popup you'll need to take it outside that div, and the only way i know to do that is by using the position:fixed... (or maybe using position:absolute on the popup, and a wrapper div with position:relative that contains the text and the popups)
(Boost Library) - boost::container::flat_set with boost::fast_pool_allocator

(Boost Library) - boost::container::flat_set with boost::fast_pool_allocator


By : Jeffery Alexander Va
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further I am trying to use *boost::container::flat_set* using the *boost::fast_pool_allocator*. However, I am getting the compilation error. Your comments and suggestions are very much appreciated. To highlight the issue, I am showing the example as below. , The ordering predicate must be part of the templated arguments:
code :
struct Conn
{
    boost::container::flat_set<
        RecQ,
        std::less<RecQ>,
        allocator_RecQ_t> m_ReceivedQ;
};
Resizable container with a contained item that overflow. Combine overflow:visible with resizability

Resizable container with a contained item that overflow. Combine overflow:visible with resizability


By : Eremit
Date : March 29 2020, 07:55 AM
may help you .
how to have a resizable container that can show an overflowed item
code :
.container {
  position: relative;
  display: inline-block;
}

.overflow-hidden {
  border: solid 1px red;
  width: 50%;
  height: 80%;
  margin-top: 18px;
  resize: horizontal;
  padding: 20px;
  overflow: hidden;
}

button {
  position: absolute;
  top: 0;
  left: 0;
}

.content {
  border: solid 1px blue;
  height: 100px;
}
<div class="container">
  <button>Toggle</button>
  <div class="overflow-hidden">
    <div class="content">
      WITH "overflow:hidden":
      <br> "resize" feature is available <strike>but pulled-up button is obviously semi-hidden</strike>
    </div>
  </div>
</div>
An overflow problem, i want to a overflow container which show overflow on hover

An overflow problem, i want to a overflow container which show overflow on hover


By : Richard Zheng
Date : March 29 2020, 07:55 AM
wish helps you there is a little to do.just take a container in it and give it width same of the main container i have solved your problem on js fiddle
HTML:
code :
<div class="overflow-container">
  <div class="overflow-fix">
        The standard Lorem Ipsum passage, used since the 1500s
        "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum."

        Section 1.10.32 of "de Finibus Bonorum et Malorum", written by Cicero in 45 BC
        "Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae vitae dicta sunt explicabo. Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt. Neque porro quisquam est, qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit, sed quia non numquam eius modi tempora incidunt ut labore et dolore magnam aliquam quaerat voluptatem. Ut enim ad minima veniam, quis nostrum exercitationem ullam corporis suscipit laboriosam, nisi ut aliquid ex ea commodi consequatur? Quis autem vel eum iure reprehenderit qui in ea voluptate velit esse quam nihil molestiae consequatur, vel illum qui dolorem eum fugiat quo voluptas nulla pariatur?"

        1914 translation by H. Rackham
        "But I must explain to you how all this mistaken idea of denouncing pleasure and praising pain was born and I will give you a complete account of the system, and expound the actual teachings of the great explorer of the truth, the master-builder of human happiness. No one rejects, dislikes, or avoids pleasure itself, because it is pleasure, but because those who do not know how to pursue pleasure rationally encounter consequences that are extremely painful. Nor again is there anyone who loves or pursues or desires to obtain pain of itself, because it is pain, but because occasionally circumstances occur in which toil and pain can procure him some great pleasure. To take a trivial example, which of us ever undertakes laborious physical exercise, except to obtain some advantage from it? But who has any right to find fault with a man who chooses to enjoy a pleasure that has no annoying consequences, or one who avoids a pain that produces no resultant pleasure?"

        Section 1.10.33 of "de Finibus Bonorum et Malorum", written by Cicero in 45 BC
        "At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Temporibus autem quibusdam et aut officiis debitis aut rerum necessitatibus saepe eveniet ut et voluptates repudiandae sint et molestiae non recusandae. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat."

        1914 translation by H. Rackham
        "On the other hand, we denounce with righteous indignation and dislike men who are so beguiled and demoralized by the charms of pleasure of the moment, so blinded by desire, that they cannot foresee the pain and trouble that are bound to ensue; and equal blame belongs to those who fail in their duty through weakness of will, which is the same as saying through shrinking from toil and pain. These cases are perfectly simple and easy to distinguish. In a free hour, when our power of choice is untrammelled and when nothing prevents our being able to do what we like best, every pleasure is to be welcomed and every pain avoided. But in certain circumstances and owing to the claims of duty or the obligations of business it will frequently occur that pleasures have to be repudiated and annoyances accepted. The wise man therefore always holds in these matters to this principle of selection: he rejects pleasures to secure other greater pleasures, or else he endures pains to avoid worse pains."



   </div>
</div>
        $scroll-bar-width:10px;
        *{
            margin: 0 auto
        }
        .overflow-container{
            width: 50vw;
            text-align: justify;
            padding: 20px;
            height: 100vh;
            overflow: hidden;
            &:hover{
                overflow: auto
            }
            &::-webkit-scrollbar {
                width: $scroll-bar-width;
            }

            /* Track */
            &::-webkit-scrollbar-track {
                background: transparent;
                box-shadow: 2px 2px 2px inset 
            }

            /* Handle */
            &::-webkit-scrollbar-thumb {
                background: #888; 
            }

            /* Handle on hover */
            &::-webkit-scrollbar-thumb:hover {
                background: #555; 
            }
        }
        .overflow-fix{
        width:50vw
        }
Buffer Overflow; Avoiding overflow attacks

Buffer Overflow; Avoiding overflow attacks


By : Kirill Fomichev
Date : March 29 2020, 07:55 AM
I hope this helps . To identify where buffer overflow will occur you will have to identify all the input path and the buffer it filled up - is the internal buffer sufficient to cater for all poissible input? Or is there any limits imposed on the amount of inputs allowed?
In your case the gets(name) has a limit in internal buffer, but gets() itself has no limits in the input it can take:
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