836 questions
4
votes
3
answers
188
views
Why is having ambiguous (default) constructor due to overloading not an error or at least a warning?
The following class compiles just fine:
class Time {
public:
Time(int h = 0, int m = 0, int s = 0); // constructor with default parameters
Time(); // default ...
- 7,290
1
vote
3
answers
114
views
Calling parameterized constructor only to update one member variable
I have a class with a default constructor which initializes many member variables via initializer lists.
I wish to have a parametrized constructor which only updates one of the member variables. A ...
- 4,159
2
votes
1
answer
136
views
Member of struct constructed twice in custom constructor?
struct PhiBlock
{
int64_t bsize; // block size
vector<int64_t> ind; // 0/1 to track [pmin(y) > pb]
fenwick_tree phi_sum; // partial sums
PhiBlock ...
- 11.5k
0
votes
1
answer
85
views
std::string and default move constructor causing heap corruption
While refactoring some code, I've run into an issue with heap corruption.
namespace GPU
{
struct ShaderStage
{
public:
ShaderStage(ShaderStageType, const Path&);
...
- 11
6
votes
1
answer
311
views
Overloaded default constructor with initializer list constructor that is also a default constructor and list initialization
Consider the following example that compiles with clang but is rejected by edg, gcc and msvc. Demo
#include <initializer_list>
struct C
{
C(){}
C(std::initializer_list<int> i = {...
- 47k
3
votes
1
answer
169
views
If I do not declare move constructor, the copy one is called, but if I delete the move constructor - compilation error - why?
struct X
{
X() = default;
X(const X& src)
{
cout << "copy" << endl;
}
};
int main()
{
X x1;
X x2(move(x1));
}
Output:
copy
struct ...
- 1,607
1
vote
1
answer
120
views
Trying to understand the different ways of initializing std::string
std::string str;
std::string(str);
std::string str = {};
Are they the same? If no then what's the difference? And when should I use each of them?
New to C++ and trying to understand the different ...
- 39
2
votes
0
answers
110
views
Difference between deleting and not writing a constructor [duplicate]
The following code snippet
#include <iostream>
#include <vector>
class IntegerContainer {
public:
IntegerContainer()
{
std::cout << "default" << std::...
- 521
2
votes
3
answers
431
views
Why do we still need to implement 'noArgsConstructor' if Java gives a non-parameterized constructor by default?
In Spring boot if we are creating a POJO class and we end up creating only a parameterized constructor and not any default constructor then Java will throw errors, why does this happen if Java ...
- 148
1
vote
2
answers
154
views
What value to assign to a char* in default constructor c++?
I have a class String and I've made a field char* name, default, parameterized, copy constructor, destructor and overwritten operator =.
My question is how my default constructor should look like for ...
- 21
1
vote
3
answers
195
views
Are these three default constructors equivalent in C++?
Consider the following code:
#include <type_traits>
template<typename T>
struct A1 {
T t;
// implicitly-declared default constructor
};
template<typename T>
struct A2 {
...
- 44.5k
0
votes
1
answer
62
views
Using default constructor to set the object attribute to default value in C++
I created a class Event
class Event {
char m_event_desc[DESC_LENGTH + 1]; // description of the event
unsigned int m_time; // time when the event starts
unsigned int getHour();
...
- 19
-1
votes
1
answer
105
views
why default constructor is not used in value initialisation in c++ [duplicate]
c++ primer says :
The default constructor is used automatically whenever an object is default or
value initialized.
Default initialization happens
• When we define nonstatic variables (§ 2.2.1, p. 43)...
0
votes
1
answer
80
views
Non-aggregate initialization
I need to implement an AutoDocs class that will contain information about the license plate number and driver's full name. It is necessary to implement the class with the following invariants: the ...
- 13
-1
votes
2
answers
182
views
Could an implicit compiler created default constructor have more than a null body?
Could an implicit compiler created default constructor have more than a null body?
According to IBM's website, the answer is: no.
I have this project that's kind of stumping me though:
This is where ...
- 163