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I'm working with a few HID devices, all of which have classes deriving from the following base class (in main.h ): class HIDDevice { public: hid_device *device; virtual void read(std::fstream)=0; virtual void write(std::fstream)=0; }; Here's one of the device classes deriving from it ( device.h ): class MyDevice : public HIDDevice { public: void read(std::fstream); void write(std::fstream); }; ...and a sample of the implementation: void MyDevice::read(std::fstream file) { // Read from card and write to file response = send_command(READ_DEVICE); file.write((char *)&response[0], response.size()); } ...and the caller: fstream file (filename, ios::binary | ios::in); dev->read(file); When I try and compile, I get the following error: main.cpp:294:27: error: use of deleted function ‘std::basic_fstream::basic_fstream(const std::basic_fstream&)’ In file included from source/main.cpp:24:0: /usr/include/c++/4.6/fstream:761:11: error: ‘std::basic_fstream::basic_fstream(const std::basic_fstream&)’ is implicitly deleted because the default definition would be ill-formed: ... and I have no idea why, probably because I'm fairly new to C++ and I've done something idiotic. Changing the arguments back to references (using &), I get the following error: /main.o:(.rodata._ZTV13MyDevice[vtable for MyDevice]+0x18): undefined reference to `MyDevice::write(std::basic_fstream >&)' Can anyone help me fix this problem?

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