使用 void 函数作为回调，从 "std：：function<void ()>？

Question

我有一个基于boost：：Asio的串行端口读取器，它使用回调，如下所示：

void received(const char *data, unsigned int len)
{
string s(data, len);
cout <<  s  << endl;    
}
int main()
{
try {
CallbackAsyncSerial serial("COM4", 115200);
serial.setCallback(received);
for(;;)
{
if(serial.errorStatus() || serial.isOpen()==false)
{
cerr<<"Error: serial port unexpectedly closed"<<endl;
break;
}
char c;
cin.get(c); //blocking wait for standard input
serial.write(&c,1);
}
quit:
serial.close();
} catch (std::exception& e) {
cerr<<"Exception: "<<e.what()<<endl;
}
}

如上所述，这将编译并运行。现在我需要将其合并到现有类中，所以我有：

void MyClass::received(const char *data, unsigned int len)
{
string s(data, len);
cout <<  s  << endl;    
}
int MyClass::main()
{
try {
CallbackAsyncSerial serial("COM4", 115200);
serial.setCallback(received); //COMPILE ERROR HERE
for(;;)
{
if(serial.errorStatus() || serial.isOpen()==false)
{
cerr<<"Error: serial port unexpectedly closed"<<endl;
break;
}
char c;
cin.get(c); //blocking wait for standard input
serial.write(&c,1);
}
quit:
serial.close();
} catch (std::exception& e) {
cerr<<"Exception: "<<e.what()<<endl;
}
}

但是，添加MyClass::received会停止编译，给我：

Error (active)  E0415   no suitable constructor exists to convert from "void (const char *data, unsigned int len)" to "std::function<void (const char *, size_t)>"

我尝试将其调整为：

std::function< void() >received(const char *data, unsigned int len);

但我看到了同样的事情。 我需要在这里做什么？

Answer 1

在评论中回答 rafix07

我需要的是将setCallback行调整为：

serial.setCallback(
std::bind(&MyClass::received, this, std::placeholders::_1, std::placeholders::_2));