From the cppref (emphasis is mine): Extracting a node invalidates the iterators to the extracted element. Pointers and references to the extracted element remain valid, but cannot be used while element is owned by a node handle: they become usable if the element is inserted into a container. However, the following code runs well: #include ..
Category : pointers
The code shows an invalid conversion from int to *int how do I fix the problem … the full detail of error is given below : Code: #include <iostream> using namespace std; bool isSafe(int** arr[], int x, int y, int n) { if (x > n && y > n && arr[x][y] == 1) { ..
I got this error "munmap_chunk(): invalid pointer Aborted" when I using qsort() to sort a array that contains class objects. Here is my code: #include <iostream> #include <string> #include <cstdlib> class MyString : public string { public: MyString(const char *str) :string(str) {} MyString(const string & str) :string(str) {} }; int CompareString(const void * e1, const ..
So I have been tinkering with C++ lately and I allocated memory for an integer like this: int* p = new int; As I thought, an integer is usually 4 / 3 bits depending on the system architecture, but when printing the size of the memory that this pointer allocates: cout << sizeof p << ..
pass * as a function parameter #include <iostream> class A { public: A() {} }; class B : public A{ public: B() {} }; void foo(A* a) { a = new B(); } void ff() { A a; foo(&a); } pass ** as a function parameter #include <iostream> class A { public: A() {} }; ..
pass * as a function parameter #include <iostream> class A { public: A() {} }; class B : public A{ public: B() {} }; void foo(A* a) { a = new B(); } void ff() { A a; foo(&a); } pass ** as a function parameter #include <iostream> class A { public: A() {} }; ..
I’m trying to understand how the Win32 API handles Pointer ownership. The concrete example i am looking at right now is the ownership of pointers to strings that i pass to the API and that i get from the API. Take for example the SetWindowText function. It takes an LPCSTR, a pointer to a null ..
I’m new to C++ and am attempting to figure out what I’m supposed to do. Is there a difference in performance between the following options: const DATATYPE* name —VS— DATATYPE* name Source: Windows Que..
I want to concatenate the path of a directory which is "/sdcard/hello.txt", but my problem is the first half(/sdcard) is defined in #define format and 2nd is const char *file_path("/hello.txt") which I am taking from the user. So to make a full path I have to concatenate these two halfs to make a full path ..
I need to keep an array of pointers in c++. I have a Set which keeps objects of my class. Then I need to iterate over the set and keep the pointer of each item in array. array is 2D by the way. so What I need in summary is : pointers[1][4] = PinterToAnItem; the ..
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