What does ~(uint32_t) mean?

Question

I'm reading a bit of C code in an OS kernel that says

x & ~(uint32_t)CST_IEc;

What does the ~() mean? It's a tilde followed by parentheses!

Answer 1

~() is actually two things:

1. (uint32_t) is a cast.
2. ~ is a bitwise complement operator.