Questions tagged [polymorphism]
In computer science, polymorphism is a programming language feature that allows values of different data types to be handled in a uniform manner.
polymorphism
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Using Assumed Rank with Unlimited Polymorphic Issues
There must be something I'm misunderstanding.
I'm attempting to use an assumed rank unlimited polymorphic variable to store data. When I do this I either get access violations or corrupted data. I ...
- 1,549
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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 ...
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36
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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
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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
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votes
1
answer
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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\...
- 2,329
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97
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How do you use polymorphism with Go maps?
I'm curious on what kind of patterns should used in Go for such cases. So let's suppose, you have a Request struct that holds some information for making an HTTP request, along with the parameters ...
- 433
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15
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Efficient design solution for handling dynamic marking schemes with multiple levels and subjects
We're developing a grading system for a school with multiple levels (e.g., elementary, middle school, high school) and various subjects within each level (n subjects < 200). The challenge is that:
...
2
votes
3
answers
150
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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
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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 ...
5
votes
2
answers
104
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How to change the type of a polymorphic record using lenses?
In the following code snippet, how do I write the toRecordWrite function such that it can work with any DbRecord with similar type-level mechanics, eg. UserPoly id createdAt updatedAt email username ...
- 6,693
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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
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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
31
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polymorphic type displaying as blank in the inspector
It's not easy to specifically explain what the problem is, and the code through which the problem could be originating is extensive, and I am uncertain how to narrow it down beyond what I already have,...
- 178
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How do I implement this properly? A question that involves Java generics, inheritance, and consumers
I'm trying to implement a sort-of Builder pattern that takes in raw data, and depending on what needs to be built, gets a predefined schema with a set of Consumers, specifically targeted for what ...
- 116
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Is there a way to use `JsonTransformingSerializer` with the base class while letting Kotlin automatically generate the class hierarchy?
I am trying to deserialize a json object that has a recursive hierarchy, however, the json structure does not include type discriminators:
...
"ObjectName": {
...
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