unique_ptr<> causes compliation errors in C++ - c++

Question

I am using this library: https://github.com/Agamnentzar/bluetooth-serial-port
BTSerialPortBinding::Create(address, channelID)
Returns new instance of BTSerialPortBinding object
address: string containint bluetooth address of the device
channelID: ID of the serial port channel
I have a statement:
unique_ptr<BTSerialPortBinding>bt(BTSerialPortBinding::Create(d1.address, 1));
When I separate the statement with the declaration in ArduinoDevice.h and initialisation in ArduinoDevice.cpp in constructor like so:
std::unique_ptr<BTSerialPortBinding> bt;
bt.reset(BTSerialPortBinding::Create("93:83:, 1));
When I added these statements I got the following error:
ArduinoDevice &ArduinoDevice::operator =(const ArduinoDevice &)': attempting to reference a deleted function
Relevant bit in Process.cpp file which is referenced by the error
dev = ArduinoDevice("/dev/tty.IP-DevB");
Process.h
#ifndef __PROCESS_H
#define __PROCESS_H
#define _USE_MATH_DEFINES
#include "ResonantLowpassFilter.h"
#include "ArduinoDevice.h"
//==============================================================================
/**
*/
class AudioProcessor : public AudioProcessor
{
public:
//==============================================================================
WahwahAudioProcessor();
~WahwahAudioProcessor();
void prepareToPlay (double sampleRate, int samplesPerBlock);
void releaseResources();
void processBlock (AudioSampleBuffer& buffer, MidiBuffer& midiMessages);
AudioProcessorEditor* createEditor();
int getNumParameters();
int getNumPrograms();
int getCurrentProgram();
void setCurrentProgram (int index);
const String getProgramName (int index);
void changeProgramName (int index, const String& newName);
float centreFrequency_, q_;
void updateFilterArduino();
ArduinoDevice dev; //instance to an Arduino device from which sensor data is read
};
#endif // _PROCESS
ArduinoDevice.h
#ifndef ArduinoDevice_h
#define ArduinoDevice_h
#include <stdio.h>
#include "BTSerialPortBinding.h"
#include <memory>
class ArduinoDevice
{
public:
ArduinoDevice(const char *dev="");
void connect();
void start(void);
void stop(void);
void read(void);
/**
Disconnects from Arduino device
**/
~ArduinoDevice();
private:
const char *device; //port address of the device (e.g. "/dev/tty.FireFly-E552-SPP")
std::unique_ptr<BTSerialPortBinding> bt; //bt serial port
void close(void);
};
#endif
Edit:
I am using Windows 10, Visual Studio 2015 and Microsoft's C++ Compiler. I am also using an extra JUCE library(https://www.juce.com/).
dev = ArduinoDevice("/dev/tty.IP-DevB"));
dev is declared in the Process.h file above its an instance of ArduinoDevice
My constructor looks like this:
ArduinoDevice::ArduinoDevice(const char *dev)
{
device = dev;
bt.reset(BTSerialPortBinding::Create("98:D3:31:FD:11:1A", 1));
}
I've now tried this in ArduinoDevice.cpp and declaration .h but I still get the same error as above:
ArduinoDevice&&(const char *dev);
{
data = dev.data;
dev.data = nullptr;
}

Answer 1

unique_ptr is not copyable. So when you declare it as a member of your class, your class becomes non-copyable too. The error exactly points that out. (Copy assignment operator is deleted because of that).
Note that usually the move assignment operator is automatically generated by the compiler for you. But in your case since you've explicitly defined a destructor for your class, compiler cant safely define a move assignment operator (or constructor) for you.