Note: Before posting the question, I have gone through the existing questions on std::bad_weak_error while using shared_from_this
to pass the shared_ptr of the existing shared_ptr instance to another method. None of them are similar to this as:
- There is already an existing shared_ptr instance of the class created before trying to call
shared_from_this()
- The class inherits from std::enable_shared_from_this<> publically.
Here is the sample code to reproduce the error:
#include <iostream>
#include <memory>
class ILogger {
public:
virtual ~ILogger() {}
virtual void Log() = 0;
};
class LogManager;
class Logger : public ILogger {
public:
Logger(std::shared_ptr<LogManager> logManager)
: m_logManager(logManager)
{
}
void Log() override
{
std::cout << "Dump logs";
}
private:
std::shared_ptr<LogManager> m_logManager;
};
class ILogManager {
public:
virtual ~ILogManager() {}
virtual std::shared_ptr<ILogger> GetLogger() = 0;
};
class LogManager : public ILogManager, public std::enable_shared_from_this<LogManager> {
public:
virtual std::shared_ptr<ILogger> GetLogger()
{
return std::static_pointer_cast<ILogger>(std::make_shared<Logger>(this->shared_from_this()));
}
};
class LogManagerFactory {
public:
static ILogManager* Create()
{
auto logManager = new LogManager();
return logManager;
}
};
int main()
{
auto logManager = std::shared_ptr<ILogManager>(LogManagerFactory::Create());
auto logger = logManager->GetLogger();
}
The error:
Program returned: 139
terminate called after throwing an instance of 'std::bad_weak_ptr'
what(): bad_weak_ptr
Link to code: https://godbolt.org/z/GTcafM449
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