在 C++ 中使用宏的可变参数

Question

I have 2 platforms which require different library functions but I want to minimize the code required to support them.

C++14 Code :

#ifdef PLATFORM2
#define FUNCTION_AUTO unsigned int dmd
#else
#define FUNCTION_AUTO void
#endif

//-- WITHIN THE LIBRARY -- //
double getQuality(FUNCTION_AUTO){
  //Computing
  // return value;
}

//-- MAIN EXECUTABLE -- //
int main() {
  std::cout << "Hello World!\n";
#ifdef PLATFORM2
  getQuality(100);
#else
  getQuality();
  #endif
}

Is there a better way to define getQuality(..) to be common between the 2 platforms without using preprocessor manipulation ?

Answer 1

The normal approach here would be to abstract the platform specific bits into a library and have a consistent abstraction on top of them.

platform.h

double Quality();

platform_a.cc

#inclue "platform.h"

double Quality() {
  return getQuality();
}

platform_b.cc

#include "platform.h"

double Quality() {
  return getQuality(100);
}

main.c

#include <iostream>
#include "platform.h"

int main() {
  std::cout << Quality();
}