logo
Tags down

shadow

how to avoid to use memcpy to create a string


By : NewInNewHamp
Date : August 01 2020, 03:00 PM
should help you out Use an std::string_view to avoid copying the string.
code :
#include <string_view>
// ...

const string_view strview(p, 4);


Share : facebook icon twitter icon

avoid trap representation with memcpy


By : user3897568
Date : March 29 2020, 07:55 AM
it helps some times Please consider the following code: , The sanctioned way which won't produce any trap representation is
code :
unsigned char obj[sizeof float];
memcpy(obj, &float_value, sizeof float);

spsc_queue pop - avoid memcpy?


By : jeson
Date : March 29 2020, 07:55 AM
hop of those help? You can't.
This is exactly required so the SPSC queue can be implemented in a lockfree fashion (assuming fixed capacity).

How to avoid memcpy if number of blocks depends on device variable?


By : YG 项
Date : March 29 2020, 07:55 AM
Hope this helps I am computing a number, X, on the device. Now I need to launch a kernel with X threads. I can set the blockSize to 1024. Is there a way to set the number of blocks to ceil(X / 1024) without performing a memcpy? , I see two possibilities:

Why gcc duplicates rodata string for memcpy? How to avoid it?


By : Manoz Kumar
Date : March 29 2020, 07:55 AM
this will help The behavior you observe is specified explicitly by the standard. In
code :
static const char pattern[] = "[SOME TEST PATTERN TO CALCULATE SUM FROM] ";
static const char * const pattern = "[SOME TEST PATTERN TO CALCULATE SUM FROM] ";
static const char pattern[] = {
        '[', 'S', 'O', 'M', 'E', ' ', 'T', 'E', 'S', 'T', ' ', 'P', 'A', 'T',
        'T', 'E', 'R', 'N', ' ', 'T', 'O', ' ', 'C', 'A', 'L', 'C', 'U', 'L',
        'A', 'T', 'E', ' ', 'S', 'U', 'M', ' ', 'F', 'R', 'O', 'M', ']', ' ', '\0' };

How avoid memcpy with flip and transpose in arrayfire?


By : Kushal Parikh
Date : March 29 2020, 07:55 AM
may help you . ArrayFire uses a memory manager to avoid unnecessary allocation and deallocations. This is required because all allocations trigger an implicit device synchronize on all queues on certain platforms. This can get very costly so ArrayFire will track af::arrays which go out of bounds and reuse them if necessary. ArrayFire also allocates memory at startup.
In your case you are allocating ~600MB at the randu call(c64 is a complex double so each element is 16 bytes). There is another 600MB allocation for the flip operation which is stored in b. Transpose will allocate 600MB but will reserve the older values for reuse. At this point you have about 1800 MB of memory allocated because of these operations.
Related Posts Related Posts :
  • Why isn't my variable being updated and my LEDs don't go on?
  • Says it cannot be used as constant
  • How to make word triangle in c++ with for loop
  • Find substring in string from the end
  • Get max of 2 objects
  • C++ Program skipping second fuction call
  • How do i use MMX mulH and mulL for two 64 bit integers to get one 128 bit integer
  • c++ fold expression with user defined class
  • Two sets of curly braces using lambda functions?
  • IsDigit() in c reading char as digit in C
  • How shared_ptr detects if it has to call delete[] or delete
  • Why the loop becomes infinite?
  • Is it possible to define a 'move-and-swap idiom' equivalent in C++03
  • How to set all the bits in a char array to zeros?
  • Why register storage class is explicitly deprecated
  • Not getting the expected output in strings
  • How do I look for a byte sequence in a file?
  • Iterate through template parameter
  • Is it possible to make shared_ptr covariant?
  • Is const T& rf = lvalue of T an identity conversion?
  • Compare 2 unequal size of maps c++
  • Is there a way to make a "reusable snapshot" of a program?
  • Is it possible to dereference an object to another object inside his own method?
  • vs 2015 constexpr variable non constant but fine on vs 2019?
  • How would it be possible to use variadic function without passing number of arguments and only with 3 dots?
  • How to load a STL vector with a constant
  • Hidden friend templates in class template
  • Output is NaN , how?
  • Do different/older processors run c++ code differently?
  • Trying to sort list of numbers in c++
  • makeValidWord(std::string word) not working properly
  • Unknown cause of Write Access Violation in linked list
  • How to transform template to template pre C++11
  • How can I create an array whose length is specified by a const argument?
  • How to initialize a const std vector in old c++?
  • C++: create a pointer in a program and access that location in another program
  • What is the purpose of std::thread::swap?
  • C++ Macros #ifdef
  • Is there a "cleaner" way to find the first instance of a derived class in a vector of pointers to base?
  • Segmentation Fault while using long long int
  • Why does this c++ code print out length 5 and when i'm print out string the program is automatic terminate?
  • How to prevent Dangling Pointer in C++ Legacy Code
  • 'operator=' is deprecated: Use QDir::setPath() instead
  • Saving a Class (with Vector member) as Binary File in C++
  • While loop in function not terminating
  • overload operator = in cpp for ptr
  • I was trying to experiment on call by pointers.But i encountered segmentation fault
  • How to use () initializers for vector in class?
  • Makefile with different source folder for test target
  • Large height map interpolation
  • Is below sorting algorithm O(n)?
  • I seem to be having trouble with basic if/else statements :/
  • GLM conversion from euler angles to quaternion and back does not hold
  • how select multiple elements from a tuple by several types in C++?
  • C++ macro ignoring what's after
  • Template initialization:
  • Why does tellp() give -1?
  • Function as template parameter, enforce constraint on return type?
  • Thread pooling in c++
  • Inline assembly printf interpreting integers as an address
  • shadow
    Privacy Policy - Terms - Contact Us © voile276.org