Databases
StackOverflow2013
Postsdbo
PORemoving fields in c++ vector
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PORemoving fields in c++ vector
    primarykey
    data
    text
    <p>I cannot grasp the idea and programm such a thing correctly (I'm a beginner): I have a vector. Vector has lets say elements: fieldA, fieldB, fieldC. So having array of these vectors, I want to check, beginning with the last vector in the array, and going to the direction of the first one, if one of the elements has a specific value, lets say if (vect[i].fieldA == 0.0). In such a case, if (vect[i-1].fieldA == 0.0) so has the same value, I want to remove the whole vector from array. Can someone provide me with a part of code that will visualize, how to create the proper "back iteration" loop and use function to delete it? I was trying with erase(), remove(), deque() but I failed. </p> <p>I don't want to mess here with my codes. </p> <p>Thanks for help!</p> <h3>EDIT. So I first fed in a loop my array with vectors values, then I want to remove all vectors from the end, that contain element specific value, e.g. fieldA == 0.0</h3> <p>I want to cut the array, not only remove content of vectors! There is proper inheritance between classB and classA so the feeding works well, I want only to solve this thing with deleting the vectors. example: array of vectors of 2 elements. input: 0,1 0,3 3,3 2,3 0,6 5,6 0,8 0,7 0,6 output:0,1 0,3 3,3 2,3 0,6 5,6 0,8. conclusion: 0,7 and 0,6 vectors were removed.</p> <pre><code> classA tmp; for (std::vector&lt;std::classB&gt;::iterator iter = newW.begin(); iter != newW.end(); iter++) { tmp.set_fieldA(iter-&gt;a); tmp.set_fieldB(iter-&gt;b); tmp.set_fieldC(iter-&gt;c); objA.push_back(tmp); } vector&lt;std::classA&gt; objA; for(int i = objA.size()-1; i &gt; 0; i--) { if (objA[i].fieldA == 0.0) if (objA[i-1].fieldA == 0.0) objA.erase(objA[i-1]); //remove last vector from array } </code></pre>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USberndh
    1. USberndh
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. PORemoving fields in c++ vector
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PORemoving fields in c++ vector
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PORemoving fields in c++ vector
      1. This table or related slice is empty.
      1. VTUpMod
    1. COIt's quite hard to understand exactly what's going on from the question. If you show us your code so far someone might be able to tell you how to fix it.
      singulars
      1. PORemoving fields in c++ vector
      1. USBoBTFish
    2. COAlso if you remove a vector from an array, it means you're having a 2D array like vector of vectors?
      singulars
      1. PORemoving fields in c++ vector
      1. USmakciook
    3. CO@makciook I think the vector in this context is actually a `class` with members `fieldA`, etc, and these are being stored in an array (or possibly `std::vector`)? That's why I asked for the code; it's not exactly clear.
      singulars
      1. PORemoving fields in c++ vector
      1. USBoBTFish
 

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