Error C2512 no appropriate default constructor available

Development Programming & Scripting C++
, ,
1

Hi
I’m trying to do instantiate a new object from custom class, but when I’m compilling i get these error :

error C2512 no appropriate default constructor available

this what I want to do :

UQuizQuestion *UquizAPI::getQuestion() {
	UQuizQuestion *question = new UQuizQuestion();
	question->setQuestion("test");

	return question;
}

and this is my Question class :
#include “quizMobile.h”
#include “QuizQuestion.h”

UQuizQuestion::UQuizQuestion(const class FPostConstructInitializeProperties& PCIP)
	: Super(PCIP)
{
	this->nbAnswers = 0;
}

FString				UQuizQuestion::getQuestion(){
	return this->_question;
}

TArray<FString>		UQuizQuestion::getAnswers(){
	return this->_answer;
}

void				UQuizQuestion::setQuestion(FString question){
	this->_question = question;
}

void				UQuizQuestion::setAnswers(TArray<FString> answers) {
	this->_answer = answers;
	this->nbAnswers = answers.Num();
}

void				UQuizQuestion::addAnswer(FString answer){
	this->_answer.Add(answer);
	this->nbAnswers++;
}

and the Header :

#pragma once

#include "Object.h"
#include "QuizQuestion.generated.h"

/**
 * 
 */
UCLASS()
class UQuizQuestion : public UObject
{
	GENERATED_UCLASS_BODY()

private:
	FString				_question;
	TArray<FString>		_answer;
	int					nbAnswers;

public:
	UFUNCTION(BlueprintCallable, Category = "Quiz API")
	FString				getQuestion();
	void				setQuestion(FString question);

	UFUNCTION(BlueprintCallable, Category = "Quiz API")
	TArray<FString>		getAnswers();
	void				setAnswers(TArray<FString> answers);
	void				addAnswer(FString answer);
	
};
2

I just got this same error a few minutes ago. This the solution I found. Here is how you have to instantiate objects derived from UObject:

UQuizQuestion *question = UQuizQuestion::StaticClass()->GetDefaultObject<UQuizQuestion>();
3

I also resolve it with that :

UQuizQuestion *question = new UQuizQuestion(FPostConstructInitializeProperties::FPostConstructInitializeProperties());
4

The easiest correct way to allocate a new instance of a UObject is to use NewObject:

UQuizQuestion* NewQuestion = NewObject<UQuizQuestion>();

This will ensure your object is created in the right package and set up correctly. There’s some information about UObject creation here.

5

Please note that this is accessing the default object for the class UQuizQuestion, not creating a new instance of it.

6

I got this error as well, except I wasn’t trying to create a new object. My solution was putting the following:

 : Super(ObjectInitializer)

after the constructor of a child class whose parent class constructor used FObjectInitializer as a parameter.