All Questions
Tagged with inheritance c++
10,429
questions
-1
votes
0
answers
31
views
Error inheriting non pure virtual function from class that implement another class
In my code i have this three classes, i'm using the visual studio compiler and it's compiling without any error and runs fine.
But i don't need the methodes width and height in my interface IBrick, if ...
-2
votes
0
answers
55
views
Is there a way to make my compiler warn if my method-call explicitly calls up to a non-direct-parent superclass? [duplicate]
Background: After some careless refactoring, the following dumb mistake crept into my codebase, resulting in a somewhat-hard-to-track-down runtime misbehavior:
class Grandparent
{
public:
void Foo(...
- 72.5k
1
vote
1
answer
73
views
How to provide a 'blanket implementation' of a static method for the derived class?
Consider this:
struct Base {
static Base make() { return {}; }
};
struct Derived : public Base {
// I _would_ want to have a `static Derived make()` automagically here
};
One approach to the ...
- 480
2
votes
1
answer
86
views
How to return smart pointers and covariance in C++
I am following this tutorial to understand how to return smart pointers and covariance in C++.
#include <memory>
#include <iostream>
class cloneable
{
public:
virtual ~...
- 7,650
4
votes
1
answer
94
views
Assign base object without changing inherited ones?
How valid is it to assign a new object to a base one, without changing the inherited ones?
The example below works as expected, but is it by chance?
This example is simple, but is there any situation ...
- 684
-2
votes
1
answer
54
views
When calling an inherited method from a derived class it tries to use the uninitialised fields of the base class [closed]
I have two classes. One called Agent, and the other called Player. Agent is the base class and Player is the derived class.
When calling the function SetHand() from the derived Player class, I run ...
-1
votes
0
answers
34
views
invalid covariant return type for [duplicate]
Consider the following example, which is some part of the bigger codebase, in the getInstance() if I dont return a pointer to the derived class, i.e., just void or int or a different type, the ...
- 7,650
5
votes
3
answers
170
views
Initialization order of inherited constructors
I have this example:
#include <iostream>
#define print(X) std::cout << X << std::endl
struct B1 {
B1(int _i = 5): i(_i) { print("B1 constructor"); };
int i;
};
...
- 1,932
1
vote
1
answer
87
views
Inherited functions returning self reference with derived type
I am trying to create a system where one base class has a bunch of functions, then derived classes can inherit it and add more functions. However, all of these functions return the this keyword and I ...
-1
votes
0
answers
56
views
Compiler misidentifying/unrecognising type [duplicate]
I have the following class with constructor:
command.h:
#include "./robots.h"
enum class CMD { //...... };
class CommandTemplate {
//.....
public:
virtual std::unique_ptr<...
- 1
1
vote
3
answers
81
views
Inheriting Structs in C++
I am working with the LibAV library, converting it from C to C++ (and moving to an object oriented style).
This library has structs to hold data, which need to be created using specific allocation ...
- 51
0
votes
0
answers
56
views
C++ continue base class bitfield in derived class
I have a base class with a bitfield
enum Enum {
ENUM1,
ENUM2,
...
ENUM8
};
struct Base {
Enum type : 3;
};
I am inheriting a class
struct Derived : public Base {
bool bf1 : 1;
u32 bf2 : 19,...
- 31
0
votes
1
answer
65
views
Calling student method from parent class definition
I'm making an LCD menu and having trouble with the lcdmenu (main menu) and submenu interaction.
class submenu;
class lcdmenu
{
protected:
command **commandlist;
submenu **submenulist;
... ...
0
votes
1
answer
76
views
Abstract function's copy constructor deleted, class inherited from this class gives error
Given header files named Point.h:
#pragma once
struct Point {
double x, y;
};
and Shape.h:
#pragma once
#include "Point.h"
#include <vector>
class Shape {
public:
...
- 11
0
votes
1
answer
74
views
Strange inheritance behavior with base class
I hope someone can help me since can't quite understand how it is possible that the following code can work.
I have a base class with some classes that derive from it.
Each derived class has its own ...
