nullptr Questions
5
Solved
Recently tried the following program and it compiles, runs fine and produces expected output instead of any runtime error.
#include <iostream>
class demo
{
public:
static void fun()
{
st...
Forficate asked 12/2, 2015 at 16:34
1
Solved
Hello? I'm studying Doubly Linked List
Anyway, when I used to put data on node, there were C6011 error
[:Dereferencing Null Pointer 'NewNode']
So I refered https://learn.microsoft.com/ko-kr/visua...
2
I want to loop through an array of pointers to an abstract class to find an "empty" slot, that is to check whether an element points to an object of a derived class or not. My approach is to create...
Euphemie asked 23/9, 2019 at 1:41
3
Solved
As far as I'm aware nullptr is a part of the core language.
Quoting C++11: (18.2/9)
nullptr_t is defined as follows:
namespace std { typedef decltype(nullptr) nullptr_t; }
and is defined ...
2
Quoting C++11: (18.2/9)
nullptr_t is defined as follows:
namespace std { typedef decltype(nullptr) nullptr_t; }
The type for
which nullptr_t is a synonym has the characteristics described ...
3
Solved
When used as a boolean expression or transformed into a boolean either explicitly or implicitly, is nullptr consistently false? Is this implementation defined or specified in the standard?
I wrote...
Hortensiahorter asked 16/8, 2019 at 15:19
2
Solved
The CppReference page for make_shared says (same with make_unique)
May throw std::bad_alloc or any exception thrown by the constructor of T.
If an exception is thrown, the functions have no ef...
Mats asked 23/7, 2019 at 7:18
2
Solved
Is this code fragment valid? :
unique_ptr<A> p(new A());
p = nullptr;
That is, can I assign nullptr to a unique_ptr ? or it will fail?
I tried this with the g++ compiler and it worked, b...
Maturity asked 25/2, 2013 at 15:51
1
Solved
I am writing a wrapper for SDL_Texture* raw pointer which returns a unique_ptr.
using TexturePtr = std::unique_ptr<SDL_Texture, decltype(&SDL_DestroyTexture)>;
TexturePtr loadTexture(SD...
Petrel asked 9/5, 2019 at 17:36
2
Solved
To my knowledge a reference cannot be null, but when I run code like this:
#include <iostream>
#include <string>
void test(int i, const std::string& s = nullptr) {
std::cout <...
Malapropism asked 6/5, 2019 at 8:22
2
Solved
I have a following snippet of code that assigned nullptr to bool type.
#include <iostream>
int main()
{
bool b = nullptr;
std::cout << b;
}
In clang 3.8.0 working fine. it's give ...
4
Solved
I have a template like:
template <class A, class B>
void func(A* a, B* b){
...
}
In some cases it happens that parameter B* b is not needed and therefore, I try to use a nullptr:
MyA a;
...
3
Solved
This definition works:
const auto &b{nullptr};
while this fails:
auto *b{nullptr};
I have tried to compile this in Visual C++, GCC, and Clang. They all complain "cannot deduce type".
In ...
4
Solved
I have some overloaed methods which take some different pointer types.
Now I want to call one specific method with nullptr as a parameter.
I know that I could cast the nullptr to the specific typ...
Flipflop asked 28/8, 2018 at 10:55
1
Solved
I was playing with SFINAE and found behavior I cannot explain.
This compiles fine:
template<typename Integer,
std::enable_if_t<std::is_integral<Integer>::value>* = nullptr>
voi...
Corella asked 8/6, 2018 at 17:28
4
Solved
According to the draft of the standard N4713 (7.11/1):
A null pointer constant is an integer literal (5.13.2) with value zero or a prvalue of type std::nullptr_t.
and 21.2.3/2:
The macro NU...
Oftentimes asked 21/2, 2018 at 10:50
5
Solved
In my early days with C++, I seem to recall you could call a member function with a NULL pointer, and check for that in the member function:
class Thing {public: void x();}
void Thing::x()
{ if (...
2
Solved
When I am reading some example code of Qt, I usually see they initialize a pointer to nullptr, for example:
QPushButton *startButton = nullptr;
I have some very basic idea of nullptr, but never ...
2
Solved
currently I am reading "A tour of C++" by Byarne Stroustrup. The thing that matters: on "pointers, arrays and references" he gave an example about using nullptr like this:
int count_x(char* p, cha...
2
Solved
C++03 Standard say's:
5.3.5 Delete
[...] In either alternative, if the value of the operand of delete is the null pointer the operation has no effect.[...]
char *p = nullptr;
delete p; //no effec...
Nordine asked 17/11, 2017 at 16:12
1
Solved
And if so, why does the following code give me the warning
note: neither the destructor nor the class-specific operator delete will be called, even if they are declared when the class is defined...
Utica asked 17/11, 2017 at 15:7
4
Solved
I have a question about C++11 best practices. When clearing a shared_ptr, should I use the reset() function with no parameter, or should I set the shared_ptr to nullptr? For example:
std::shared_p...
Phrasing asked 22/4, 2013 at 16:3
1
I learned about std::nullptr_t that is the type of the null pointer literal, nullptr.
Then I made small program :
#include <iostream>
int main()
{
std::nullptr_t n1;
std::cout<<n...
5
Solved
I have three LPCWSTR string variables called A, B, C.
I am assigning them from another function which can sometimes return nullptr if something goes wrong. like this:
A = MyFunc();
B = MyFunc();
...
2
Solved
Actually I am writing my own version of all library classes, and I don't want to include the STL files into my class file.
So, for example, I want to check whether the node is equal to null.
If I w...
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