What is the difference between new/delete and malloc/free?

What is the difference between new/delete and malloc/free?

What is the difference between new/delete and malloc/free?Related (duplicate?): In what cases do I use malloc vs new? 1:new/deleteAllocate/release memoryMemory allocated from 'Free Store'Returns a fully typed pointer.new (standard versio

C++ delete - It deletes my objects but I can still access the data?

C++ delete - It deletes my objects but I can still access the data?

I have written a simple, working tetris game with each block as an instance of a class singleblock.class SingleBlock{ public: SingleBlock(int, int); ~SingleBlock(); int x; int y; SingleBlock *next;};class MultiBlock{ pu

Micro fusion and addressing modes

Micro fusion and addressing modes

I have found something unexpected (to me) using the Intel® Architecture Code Analyzer (IACA).The following instruction using [base+index] addressing addps xmm1, xmmword ptr [rsi+rax*1]does not micro-fuse according to IACA. However, if I use

Segmentation fault on large array sizes

Segmentation fault on large array sizes

The following code gives me a segmentation fault when run on a 2Gb machine, but works on a 4GB machine.int main(){ int c[1000000]; cout << "done\n"; return 0;}The size of the array is just 4Mb. Is there a limit on the size of an array

Specifically, what's dangerous about casting the result of malloc?

Specifically, what's dangerous about casting the result of malloc?

Now before people start marking this a dup, I've read all the following, none of which provide the answer I'm looking for:C FAQ: What's wrong with casting malloc's return value?SO: Should I explicitly cast malloc()’s return value?SO: Needle

Recommendations for a heap analysis tool for Java? [closed]

Recommendations for a heap analysis tool for Java? [closed]

List your favorite heap analysis tools (e.g. jprofiler, jmap, ...).Let's keep it one tool per answer, with a short list of pros and cons for each tool. 1:YourKit : http://www.yourkit.com/Pros:The interface is clean and it's fastIt opened

What is DOM Event delegation?

What is DOM Event delegation?

Can anyone please explain event delegation in JavaScript and how is it useful? 1:DOM event delegation is a mechanism of responding to ui-events via a single common parent rather than each child, through the magic of event "bubbling" (aka

Static keyword in function parameter

Static keyword in function parameter

I've just found this function definition in some embedded code:float round_float_to_4(static float inputval);I'm familiar with other uses for static (global variables, functions and local variables), but this is the first time I see it as s

boost scoped_lock vs plain lock/unlock

boost scoped_lock vs plain lock/unlock

I'm going to use boost::mutex from boost/thread/mutex.hpp.There are several ways to lock/unlock mutex: with scoped_lock, unique_lock, lock_guard, mutex's member functions ::lock() and ::unlock() and nonmember functions lock() and unlock().I

First query is slow and pre-generated views aren't being hit (probably)

First query is slow and pre-generated views aren't being hit (probably)

I'm having a bit of trouble with the time it takes EF to pull some entities. The entity in question has a boatload of props that live in 1 table, but it also has a handful of ICollection's that relate to other tables. I've abandoned the ide

How to render/draw buffer object to framebuffer without glDrawPixels

How to render/draw buffer object to framebuffer without glDrawPixels

According to opengl spec 4.0 glDrawPixels is deprecated.For cuda interoperability it seems best to use "opengl buffer objects". (An alternative could be textures or surfaces but these have caching/concurrency issues and are therefore unusab

Comet Programming in IIS

Comet Programming in IIS

It is said that IIS is not recommended for Comet programming. If that is true, how is it that other web servers are able to handle this vis a vis IIS. So what is it that other web servers do additionally which allows them to scale out. 1

Fourier space filtering

Fourier space filtering

I have a real vector time series x of length T and a filter h of length t import numpy as npfrom scipy.signal import fft, iffty = np.real( np.ifft( np.fft(x) * h ) ) )Since the conditions don't hold, I tried the following hack:Select a padd

What is the overhead in splitting a for-loop into multiple for-loops, if the total work inside is th

What is the overhead in splitting a for-loop into multiple for-loops, if the total work inside is th

This question already has an answer here: Why are elementwise additions much faster in separate loops than in a combined loop? 9 answers Pe

How do you initialize a gensim corpus variable with a csr_matrix?

How do you initialize a gensim corpus variable with a csr_matrix?

I have X as a csr_matrix that I obtained using scikit's tfidf vectorizer, and y which is an arrayMy plan is to create features using LDA, however, I failed to find how to initialize a gensim's corpus variable with X as a csr_matrix. In othe

IOS app killed for Low Memory but no Memory Warning received

IOS app killed for Low Memory but no Memory Warning received

I'm stuck with a problem for some time now and I would like to know if anyone can help.I'm developing an IOS app (iPad) using a main navigation controller and a lot of UIImage.After using the application for a while, the app get killed for

How do I get a Java resource as a File?

How do I get a Java resource as a File?

I have to read a file containing a list of strings. I'm trying to follow the advice in this post. Both solutions require using FileUtils.readLines, but use a String, not a File as the parameter.Set lines = new HashSet(FileUtils.readLines("

How to protect background service/alarms to be kill in newly launched devices in customized OS like

How to protect background service/alarms to be kill in newly launched devices in customized OS like

I have a WakefulBroadcastReceiver with IntentService, every half hour alarm called and doing some stuff.I have already handle doze mode with setExactAndAllowWhileIdle() method.Some new smart phones with customized os recently launched in ma

How to effectively implement sessions in GAE?

How to effectively implement sessions in GAE?

I was wondering about implementing my own sessions (more for an exercise than anything else) for a GAE app I'm working ... at first I was thinking of using the datastore to store the session data. However, every time something needs to be a

singleton with volatile in java

singleton with volatile in java

class MyClass{ private static volatile Resource resource; public static Resource getInstance() { if(resource == null) resource = new Resource(); return resource; } }Here my doubt is

How to copy a string using a pointer

How to copy a string using a pointer

Here's a program I wrote to copy a string constant.When the program is run it crashes. Why is this happening ?#include char *alpha = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";char c;char *l;main(){ while((c = *alpha++)!='\0') *l++ = *alpha; pr

With Zxing retiring for iOS, which barcode-scanner to switch to?

With Zxing retiring for iOS, which barcode-scanner to switch to?

I have implemented ZXing to my iOS-app, however I am questioning it's maintainability as not long ago it was announced that ZXing to iOS is retiring:Retiring C++, Objective C codeI've also read that there might be compatibility issues with

What is the correct usage of realloc() when it fails and returns NULL?

What is the correct usage of realloc() when it fails and returns NULL?

Can anyone summarize what is the correct usage of realloc()?What do you do when realloc() fails?From what I have seen so far, it seems that if realloc() fails, you have to free() old pointer. Is that true?Here is an example: 1. char *ptr

UNIX Programming. struct timeval how to print it (C-programming)

UNIX Programming. struct timeval how to print it (C-programming)

I am trying to print a value of type timeval. Actually I am able to print it, but I get the following warning:Multiple markers at this lineformat ‘%ld’ expects type ‘long int’, but argument 2 has type ‘struct timeval’The program compiles an

What is the difference between business class and domain class? What is meant by persistent classes?

What is the difference between business class and domain class? What is meant by persistent classes?

What is the difference between business class and domain class? What is meant by persistent classes? 1:A domain class is a class from the Domain Model that Martin Fowler describes as follow in Patterns of Enterprise Application Architect