Zero-initializing an array data member in a constructor

Question

I\'ve got an array of class objects, and inside the class object I\'ve got another array that I\'d need to initialize to all zeros. The code compiles and runs, but my outpu

Answer 1

In Cache constructor, when you do :

byte[16]={0};

You are only setting the 16th byte of your array (which is out of bounds, so this operation has undefined behavior). Array objects are default-initialized in C++, because you store int, no initialization is performed.

You can use std::fill to initialize it :

Cache::Cache()  
{
  std::fill(byte, byte+16, 0);
}

Or you can use a regular for-loop over your array.