WCHAR wszFoo[CONSTANT_BAR] = {0}; <-- What does {0} mean?

Question

WCHAR wszFoo[CONSTANT_BAR] = {0}; 

I've never seen something like {0} used in C++ as part of the language. And I have no idea how to search for a question like this online. What is it?

Answer 1

See array initialization.

Missing initialization values use zero

If an explicit array size is specified, but an shorter initiliazation list is specified, the unspecified elements are set to zero.

float pressure[10] = {2.101, 2.32, 1.44};

This not only initializes the first three values, but all remaining elements are set to 0.0. To initialize an array to all zeros, initialize only the first value.