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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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Clearing the terminal screen?

I'm reading data from 9 different sensors for my robot and I need to display them all steadily, in the same window so I can compare the values and see if any of the readings is off. The problem I'm having with both Serial.print and lcd.print is that…
Eugen
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C++ Remove punctuation from String

I got a string and I want to remove all the punctuations from it. How do I do that? I did some research and found that people use the ispunct() function (I tried that), but I cant seem to get it to work in my code. Anyone got any ideas? #include…
NewFile
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HTML5 Canvas eraser tool without overdraw white color

I have canvas. I have paint tools pencil and eraser. How i can erase drawings without overwrite(overdraw) with white color. this my code eraser over drawing with white color: http://jsfiddle.net/66z12xb0/ I have in back end save image after…
Asker
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How do I erase printed characters in a console application(Linux)?

I am creating a small console app that needs a progress bar. Something like... Conversion: 175/348 Seconds |========== | 50% My question is, how do you erase characters already printed to the console? When I reach the 51st percentage, I…
Binny V A
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Fast erase (not clear) a ByteBuffer in Java

I am trying to "clean up" a ByteBuffer to be all zero bytes (all 0x00). I tried to loop over all positions in the buffer and set them to 0x00, but the efficiency is bad. Is there any better way to quickly clear a ByteBuffer - similar to what…
asksw0rder
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How does a 7- or 35-pass erase work? Why would one use these methods?

How and why do 7- and 35-pass erases work? Shouldn't a simple rewrite with all zeroes be enough?
stalepretzel
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Erasing element from a vector – rbegin() vs begin()

I'm trying to solve a problem in C++, a part of which requires me to erase elements from a vector using the rbegin() member function. However, the compiler throws an error every time I write the below-mentioned code. What's wrong here? int main()…
RedHelmet
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Why doesn't erase support reverse iterators?

I've just written the following code, and was very surprised it doesn't compile: std::deque container; // filling the container... for (auto it = container.rbegin(); it != container.rend(); ++it) if (*it == 5) { …
Violet Giraffe
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std::unordered_map::extract references/pointers invalidation

For the new C++17 std::unordered_map::extract function the documentation says: Extracting a node invalidates only the iterators to the extracted element, and preserves the relative order of the elements that are not erased. Pointers and…
haelix
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std::vector::erase vs "swap and pop"

The "normal" way of deleting an element from a vector goes like this: vec.erase(vec.begin() + index); But in theory it's faster just to do this: if (vec.size() > 1) { std::iter_swap(vec.begin() + index, vec.end() - 1); …
user112513312
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Remove Duplicate Entries in a C++ Vector

Just want to remove duplicates. Pool is vector> but I seem to miss some elements at the start of the vector somehow. Can anyone verify the logic of the removal? Thanks :) Pool Master::eliminateDuplicates(Pool generation) { …
Jarrod Cabalzar
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2 answers

How do you erase *AND CONTINUE* using a std::reverse_iterator?

I've been up and down stackoverflow and even the very, very nice Dr. Dobbs article but I can't find a definitive answer to the question. A section of the answer to the question What are the shortcomings of std::reverse_iterator? says that it might…
Migs
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How to delete a file such that the delete is irreversable?

I want to delete a sensitive file (using C++), in a way that the file will not be recoverable. I was thinking of simply rewriting over the file and then delete it, Is it enough or do I have to perform more actions ?
TCS
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Blending a texture to erase alpha values softly with OpenGL

I have a little paint application which was based on the GLPaint sample code. It is working fine. My Problem is that I need to implement a "brush" that erases the textures which were already drawn. My goal is to have an eraser which has soft edges.…
Hung Dang
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5 answers

Python securely remove file

How can I securely remove a file using python? The function os.remove(path) only removes the directory entry, but I want to securely remove the file, similar to the apple feature called "Secure Empty Trash" that randomly overwrites the file. What…
kyle k
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