Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>I don't think there's anything in the STL or Boost that does this.</p> <p>One thing you can do is to make your algorithm a little bit more general:</p> <pre><code>template&lt;class InputIterator, class OutputIterator&gt; void setToRanges(InputIterator first, InputIterator last, OutputIterator dest) { typedef std::iterator_traits&lt;InputIterator&gt;::value_type item_type; typedef typename std::pair&lt;item_type, item_type&gt; pair_type; pair_type r(-std::numeric_limits&lt;item_type&gt;::max(), -std::numeric_limits&lt;item_type&gt;::max()); for(; first != last; ++first) { item_type i = *first; if (i != r.second + 1) { if (r.second &gt;= 0) *dest = r; r.first = i; } r.second = i; } *dest = r; } </code></pre> <p>Usage:</p> <pre><code>std::set&lt;int&gt; set; // insert items typedef std::pair&lt;int, int&gt; Range; std::vector&lt;Range&gt; ranges; setToRanges(set.begin(), set.end(), std::back_inserter(ranges)); </code></pre> <p>You should also consider using the term <code>interval</code> instead of <code>range</code>, because the latter in STL parlance means "any sequence of objects that can be accessed through iterators or pointers" (<a href="http://www.cplusplus.com/reference/algorithm/" rel="nofollow noreferrer">source</a>).</p> <p>Finally, you should probably take at look at the <a href="http://www.boost.org/doc/libs/1_37_0/libs/numeric/interval/doc/interval.htm" rel="nofollow noreferrer">Boost Interval Arithmetic Library</a>, which is currently under review for Boost inclusion.</p>
    singulars
    1. This table or related slice is empty.
    1. POConverting sets of integers into ranges
      singulars
      1. PTQuestion
    1. PTAnswer
    1. This table or related slice is empty.
    1. USManuel
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POConverting sets of integers into ranges
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTAcceptedByOriginator
    1. COI'm afraid the current algorithm can't be used for general version: for example, it won't work with the unsigned types. The initial version at least explicitly demanded ints. Second, +1 for "interval". This was actually what I've used in my code, but posting here I decided to change it to "range" considering the term to be more familiar. Third, Boost Interval sure is powerful, but not of much use for me since all I do with the ranges is put them into the WHERE SQL clause like "DELETE FROM X WHERE id >= interval_start AND id <= interval_end"
      singulars
      1. PO
      1. USAlex Jenter
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload