logo
down
shadow

How to avoid the copy when I return


How to avoid the copy when I return

Content Index :

How to avoid the copy when I return
Tag : cpp , By : RichAA
Date : November 24 2020, 05:47 AM


Comments
No Comments Right Now !

Boards Message :
You Must Login Or Sign Up to Add Your Comments .

Share : facebook icon twitter icon

Write a function to dynamically create a new copy of string and return a pointer to the new copy (C)


Tag : c , By : Ken
Date : March 29 2020, 07:55 AM
wish help you to fix your issue this is what I have so far but I can't figure out what is wrong with it
void newCopy(char *s)
{
  char newString = malloc(sizeof(int * strlen(s)));
  newString = s;
  return &newString;
}

Why does Python's copy.copy() return a object not equal to the original?


Tag : python , By : dormsbee
Date : March 29 2020, 07:55 AM
it helps some times Equality in Python for objects is checked by calling the __eq__() function.
Example:
>>> class CA:
...     def __eq__(self, other):
...             print("Equals")
...             return True
...
>>> c = CA()
>>> b = CA()
>>> c == b
Equals
True
>>> l = [1,2]
>>> l1 = [1,2]
>>> id(l)
2830504
>>> id(l1)
2831864
>>> l == l1
True

How to avoid copy-constructing a return value


Tag : cpp , By : John Bentley
Date : March 29 2020, 07:55 AM
I wish this help you The description in your question is pretty much correct. But it is important to understand that this is behavior of the abstract C++ machine. In fact, the canonical description of abstract return behavior is even less optimal
result is copied into a nameless intermediate temporary object of type std::string. That temporary persists after the function's return. That nameless intermediate temporary object is then copied to greeting after function returns.

Return value optimization: ho can I avoid copy construction of huge STL containers.


Tag : cpp , By : Bruce
Date : March 29 2020, 07:55 AM
Does that help It is meaningless. The type of RVO you mentioned is called named RVO (NRVO), and most compilers implement it.
Regardless, in C++11, vector has move constructors, so even if NRVO didn't apply, it'd still be moved, not copied.

copy object with objects avoiding mutation of the initial object (avoid copy references)


Tag : javascript , By : kokok13
Date : March 29 2020, 07:55 AM
I wish this help you I have a question regarding copy of object by reference , use this way:
let a = {
  "0": {
    "sortPluginSettings": {
      "columnSortType": "numeric",
      "sortingOrder": "noSort"
    }
  }
}

var b= JSON.parse(JSON.stringify(a));

b[0].sortPluginSettings.columnSortType=null;

console.log(a);
console.log(b);
Related Posts Related QUESTIONS :
  • double fork using vfork
  • Convert char pointer (char*) to struct
  • Does anyone have good tips for using pc-lint?
  • C++ How fast is passing around objects?
  • template type's ctor arguments at instantiation time
  • Get list of windows in taskbar on Windows 7?
  • Curl connection options
  • Best cross-platform solution for network server?
  • simple c++ file opening issue
  • Switching from C++ (with a lot of STL use) to C for interpreter building
  • How can I access the JPEG image pixels as a 3D array like we do in MATLAB?
  • What wording in the C++ standard allows static_cast<non-void-type*>(malloc(N)); to work?
  • Avoid allocating in constructor or preserve simplicity (and RAII?)
  • Can C++ raise an error when std array initialization is too small?
  • Reference to end is ambiguous
  • Problem with basic usage of std::enable_if
  • How to print out a decimal number as octal number using setiosflags in C++
  • Open Visual Studio with solution and specific file and line
  • Enum value based on template type
  • Is there any way to swap nodes in std::list?
  • How to copy QString into wchar_t buffer
  • Make the compiler generate an empty default function for an std::function
  • Insert or push_back to end of a std::vector?
  • Best practice for const temporary types
  • Include CSV File in Complied Binary
  • Issue with binding non static function to callback
  • How can read from some files and write content of them with different form into files with same names
  • Why does auto deduce this variable as double and not float?
  • no instance of overloaded function "std::make_unique" matches the argument list, but works with unique_ptr con
  • How to see array size from a pointer in c++
  • Error taking address of temporary in Eclipse
  • Using an iterator to go through a vector and modify the contents
  • Are extern extern "C", and extern "C" extern, allowed?
  • Can't solve C2660 and C2065 Errors
  • C referencing C++ extern
  • How to write the definition of a derived class in c++?
  • Why when I include <cmath> I need to use the namespace std too?
  • How to assign a 32-bit unsigned integer to a bit field containing 32 bits
  • Why does the same class being defined in multiple .cpp files not cause a linker multiple definition error?
  • C++ 11db error when trying to quit the program in xcode. beginner level
  • Add content of a vector into a Capnproto map object
  • Recursively Pass Template Template To a Template Template Function
  • Swap rows in a 2D array with std::swap. How does it work?
  • Is there any situation in which an object's storage might change during its lifetime?
  • clang++ always generates empty profraw coverage reports
  • Do memory leaks persist after program completion if the OS does not clear it?
  • How to link library using cmake
  • How to use getters and setters without generating a copy?
  • Generating multiple amounts of the same sprite broken
  • function in c++ why my compiler didn't recognize the error()
  • Relationship between copy(...) and copy(seq, ...)
  • Are <cmath> functions required to be `noexcept` in C++17?
  • How to find a struct list item
  • How can you handle DLL versions when referencing C++ DLL's over COM from VBScript with CreateObject?
  • Do not understand how c++ set works
  • Actual build date in C++
  • How to link to already compiled external shared libraries in RCPP using Makevars?
  • combination of enable_if + std::less + sizeof... makes MSVC fail
  • Can you call the destructor without calling the constructor?
  • How do I prevent a function from freeing memory of a local variable?
  • shadow
    Privacy Policy - Terms - Contact Us © scrbit.com