在C ++中，多重继承类中的下划线符号是什么意思？

Question

here is the code:

PiGenerator::PiGenerator(PP_Instance instance)
: pp::Instance(instance),
  graphics_2d_context_(NULL),
  pixel_buffer_(NULL),
  flush_pending_(false),
  quit_(false),
  compute_pi_thread_(0),
  pi_(0.0) {
  pthread_mutex_init(&pixel_buffer_mutex_, NULL);
}

Or is this even multi-inheritance? Can someone enlighten me?

Answer 1

（可能）只是一种约定：通常， private变量使用尾部下划线声明，以便人们可以轻松识别它们。

Answer 2

No, that isn't specific to multiple inheritance. That's just the naming convention the original programmer decided to make.

Answer 3

Those are actually fields of the class PiGenerator . They all constitute the initialization list , which provides values to the various fields of the class before the constructor is entered. In this example, pp::Instance is the only base class constructor involved, and the rest are field initializations.