What is reason behind getting error of "object of abstract class type is not allowed" ?

[Qt embedded developer]

When i am running the code at that time i am getting below error :

object of abstract class type "app::transaction::flow::CustomBootFlow" is not allowed

I want to know how to resolve it ?

#include "FlowFactory.h"
#include "Transactions.h"
#include "flows/Flows.h"

namespace app
{

FlowFactory::FlowFactory()
{
	appTransactionDefinition = new app::transaction::Transactions() ;
}

FlowFactory::~FlowFactory()
{
	if (appTransactionDefinition!=NULL)
		delete appTransactionDefinition ;
}

boomer::transaction::flow::BaseFlow *FlowFactory::createFlowForTransactionType(const boomer::transaction::Transaction &tr)
{
	if ((app::transaction::Transactions *)appTransactionDefinition->isBootTransaction(tr.id))
		return new app::transaction::flow::CustomBootFlow();

	return NULL;
}
}

[Qt embedded developer]

@Qt-embedded-developer said in What is reason behind getting error of "object of abstract class type is not allowed" ?:

boomer::transaction::flow::BaseFlow *FlowFactory::createFlowForTransactionType(const boomer::transaction::Transaction &tr)

there are i have done 2 changes in 2 file:

1] flowfactory.h

public:
virtual boomer::transaction::flow::BaseFlow *createFlowForTransactionType(const boomer::transaction::Transaction &tr) ;

2] CustomBootFlow.h

protected:
virtual void ConfigureOOB();
virtual boomer::transaction::TransactionResult InitializeEMVCTConfiguration();
virtual boomer::transaction::TransactionResult InitializeEMVCTLSConfiguration();

[JonB]

@Qt-embedded-developer
So it tells you app::transaction::flow::CustomBootFlow is an abstract class. Meaning you cannot instantiate directly from it (does your new app::transaction::Transactions() return a app::transaction::flow::CustomBootFlow?), it is designed for you to need to subclass from it, implement whatever pure virtual methods it has, and off you go.

If you still don't understand Google for C++ abstract class.

[Qt embedded developer]

@Qt-embedded-developer said in What is reason behind getting error of "object of abstract class type is not allowed" ?:

boomer::transaction::flow::BaseFlow *FlowFactory::createFlowForTransactionType(const boomer::transaction::Transaction &tr)

there are i have done 2 changes in 2 file:

1] flowfactory.h

public:
virtual boomer::transaction::flow::BaseFlow *createFlowForTransactionType(const boomer::transaction::Transaction &tr) ;

2] CustomBootFlow.h

protected:
virtual void ConfigureOOB();
virtual boomer::transaction::TransactionResult InitializeEMVCTConfiguration();
virtual boomer::transaction::TransactionResult InitializeEMVCTLSConfiguration();