C / C++ / MFC

Recently, I have been working with C++ includes and while examining those used in LLVM, I came across several H header files that caught my attention. I noticed that they were not templated and contained both declarations and definitions with code. To my surprise, I found that these header files were included in multiple CPP source files. Although they only define classes, I am concerned that this may result in code bloat since each source file must generate the binary for each class implementation. In my own work, I prefer to place the implementation of any non-templated class in its own CPP source file and let the linker handle it. I consider this to be essential. However, since the writers of LLVM are undoubtedly more knowledgeable, experienced, clever, and intelligent than I am, I wonder if there is something that I do not understand. Thank you.

for(i=0; i<= 100; i++)
{
  myServo.write(i);
  val = myServo.read();

  switch(val)
  {
    case 0:
    break;

   case 50:
   break;

   case 100:
   break;

 default:
//Here??
 break;
}