为什么我的fstream被隐式删除？ [英] Why is my fstream being implicitly deleted?

问题描述

我正在使用一些HID设备，所有设备都有从以下基类派生的类（在 main.h 中）：

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;
};

这是从中派生出来的设备类之一（ device.h ） ：

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);
};

...以及实施示例：

...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());
}

...和来电者：

fstream file (filename, ios::binary | ios::in);
dev->read(file);

当我尝试编译时，我收到以下错误：

When I try and compile, I get the following error:

main.cpp：294：27：错误：使用已删除的函数'std :: basic_fstream :: basic_fstream（const std :: basic_fstream&）'

源自source / main.cpp的文件：24：0：
/usr/include/c++/4.6/fstream:761:11：错误：'std :: basic_fstream :: basic_fstream（const std :: basic_fstream& '）被隐式删除，因为默认定义不正确：

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:

...我不知道为什么，可能因为我对C ++很新，我做了一些愚蠢的事情。

... and I have no idea why, probably because I'm fairly new to C++ and I've done something idiotic.

将参数更改回引用（使用&），我收到以下错误：

Changing the arguments back to references (using &), I get the following error:

/main.o:(.rodata._ZTV13MyDevice [vtable for MyDevice] + 0x18）：未定义引用`MyDevice :: write（std） :: basic_fstream>&）'

/main.o:(.rodata._ZTV13MyDevice[vtable for MyDevice]+0x18): undefined reference to `MyDevice::write(std::basic_fstream >&)'

任何人都可以帮我解决这个问题吗？

Can anyone help me fix this problem?

解决方案

尝试通过引用抛弃那些 std :: fstream 。

Try tossing those std::fstreams around by reference.

class MyDevice : public HIDDevice {
    public:
        void read(std::fstream&);
        void write(std::fstream&);
};

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