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Questions tagged [erase]

This tag refers to the process of removing or deleting data, text, files, or memory.

739 questions
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Erase-remove idiom: what happens when remove return past-the-end-iterator?

I got this question when I was reading erase-remove idiom (item 32) from Scott Meyers "Effective STL” book. vector v; ... v.erase(remove(v.begin(), v.end(), 99), v.end()); remove basically returns the "new logical end” and elements of the…
aJ.
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Is it safe to invoke std::map::erase with std::map::begin?

We (all) know, erasing an element, pointer by an iterator invalidates the iterator, for example: std::map< .. > map_; std::map< .. >::iterator iter; // .. map_.erase( iter ); // this will invalidate `iter`. But, what about: map_.erase( map_.begin()…
Kiril Kirov
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Eraser without erase background image

Hi I want to make an eraser for finger paint witch erase only what I painted not backgroud image imported. My erase is white. How can I do that?
Markus Hayner
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std::multimap and equal_range

I'm having some headaches with the std::multimap container and I wish to know what would be the proper way to achieve my goal. Basically, here is my SSCCE: #include #include int main () { typedef std::multimap…
Mihai Todor
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Java Graphics2D to erase to a alpha background

I'm making an application that has a drawing board where you draw with your mouse, it draws ontop of an Label in a BUfferedImage. What I'm trying to implement right now is an eraser, the problem is I cannot find anywhere help to make an eraser to…
nullwriter
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How to delete a line from a file after it has been used

I'm trying to create a script which makes requests to random urls from a txt file e.g.: import urllib2 with open('urls.txt') as urls: for url in urls: try: r = urllib2.urlopen(url) except urllib2.URLError as e: …
user1985563
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Erasing an element from a list container

I am having difficulty understanding why the code is behaving this way. First of all I have read the relevant answered material and still found the explanations abit advanced. So I'm wondering if some-one could explain this in a simple fashion. Ok,…
A Big Ball Of Lettuce
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Remove special characters from a string using iterators

I have a pretty simple one for you today, but it certainly has had me stumped for hours. I imagine there is something wrong with the subtitles of my string iterator. I've looked online and even passed the code to my CSE professor - but what with it…
MS-DDOS
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Javascript erase image with cursor

Is it possible with javascript? I'm trying to implement a scratchcard type thing, and I was wondering if the user could 'scratch it' with his cursor and then javascript would remove/erase the image to show the text below. But i've not been able to…
James Andrew
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How to erase content on a Bitmap

I have C# winForm application which holds a pictureBox control. This control has a Paint event. Every time paint event is fired , a Bitmap is dynamically created and I perform some drawing on it. And when user clicks "save" button , edited image…
tugrul
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erase element from vector

I have the following vector passed to a function void WuManber::Initialize( const vector &patterns, bool bCaseSensitive, bool bIncludeSpecialCharacters, bool bIncludeExtendedAscii ) I want to erase any element…
user1231229
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How to delete elements in a vector. (erase won't work )

When I delete elements in a vector with “erase”, then there is no memory cleared. For example I make a vector of the size 2000. After the creation the program use 1,5 MB memory. When I do the erase call nothing will be cleared. All the elements are…
Laurence
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Erase a foreign iterator

I experimented the following code list a ={1,2}; list b ={3,4}; a.erase(b.begin()); for (auto x:b) cout << x << endl; Strangely, the program ran fine without any error. What it prints out is 4. I wonder why erase is a member function when…
zer0ne
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Secure erasing java implementation

I need to implement Gutmann's algorithm for secure erasing some data in a database table. First of all, is it effective in a database? I'm not sure about the 35 steps. For 1-4 and 32-35, it's clear, generate some random data. But the steps 5-31 I'm…
braincell
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What is proper way to delete objects that resides in a list that you find while looping that list?

I have a list of Star structs. These structs are in a std::list I am double looping this list and compairing there locations to detect a collision. When A collision is found I will delete Star with the lowest mass. But how can I delete the Star…
EddieV223
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