All Questions
Tagged with polymorphism c++
3,651
questions
0
votes
0
answers
23
views
Cereal archive called from DLL cause polymorphism not to work
I am a newbie to cereal and lately I ran into an odd issue,
I have my serialization code inside an external DLL, in the code I use cereal's polymorphism functionality, when trying to invoke the ...
0
votes
0
answers
38
views
create object type based on base type member function return value
I am implementing a loadbalancer that should choose balancing strategy based on some logic:
class LoadBalancer{
public:
bool get_backend_cpu_info(){// some complicate logic involve member ...
- 13
-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
16
votes
1
answer
1k
views
How does C++ select the `delete` operator in case of replacement in subclass?
Let's assume I have the following code (https://godbolt.org/z/MW4ETf7a8):
X.h
#include <iostream>
struct X{
void* operator new(std::size_t size)
{
std::cout << "new X\...
- 2,339
2
votes
3
answers
154
views
In C++, compared to final or not virtual function, what is the advantage of CRTP?
I'm new to learning modern C++ programming. I have read many blogs and questions but haven't found the answer of this question. In C++, compared to final or not virtual function, what is the advantage ...
- 33
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 ...
0
votes
1
answer
52
views
Accessing Private Members of Derived Class through Base Class Pointer with Virtual Function in C++
I have a scenario in C++ where I'm accessing private members of a derived class through a base class pointer, and it seems to work without any errors. Here's a simplified version of the code:
#include ...
- 42
0
votes
0
answers
16
views
Derived class as argument of OpenCL kernel function
I am trying to compile the following OpenCL kernel code with clang-16:
clang-16 -cl-std=clc++2021 -c -emit-llvm -target spir64 -Xclang -finclude-default-header \
-o /workspace/test/...
1
vote
1
answer
44
views
Polymorphic return type for child classes
I want to make an abstract class with a pure virtual function process.
process should return a variable of type Result:
class Base {
public:
class Result {
public:
int a = 1;
...
- 1,423
1
vote
2
answers
71
views
C++ multiple inheritance- class method running twice
I have an exercise to practice multiple inheritance and polymorphism and something is not going well.
The exercise includes 4 classes I need to build:
Creature
char * name
int age
int ...
- 21
-1
votes
2
answers
63
views
Polymorphic behavior of derived class objects in C++ STL list [duplicate]
I am storing objects of base and derives classes (Account, StudentAccount, EmployeeAccount) in an STL list and process them with STL Iterator. The dynamic polymorphic behavior of objects is not ...
0
votes
0
answers
27
views
Unexpected vTable look-up for non-virtual method in C++ [duplicate]
The code snippet below explains the problem:
class base_obj_with_virtual_func
{
public:
int variable_int;
virtual void print_name() { std::cout << "Base obj " << this <...
- 1
0
votes
1
answer
39
views
Why is dynamic dispatch not working within a template function?
I have the following code. There is a base class (Node) and a derived class (NumberExprNode) that each have a virtual equality method.
#include <vector>
#include <memory>
#include <...
- 11
0
votes
1
answer
47
views
How to call derived type methods from vector of base type stored in a different class?
say I have some class foo that has a vector of pointers to another class Bar and a LogBarVec() method that logs each Bar's internal type:
class Foo {
std::vector<std::unique_ptr<Bar>> ...
0
votes
1
answer
75
views
When is it appropriate to assign a unique_ptr to a shared_ptr?
This is a follow up to the question that was asked here: Does C++11 unique_ptr and shared_ptr able to convert to each other's type? and more specifically the top voted answer.
The snippet that caught ...
- 1,181