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This is probably a really silly question to experienced C++ developers, but what is the purpose of casting a -1 to uint32? I am translating a program from C++ to C# and there are many occasions when I see something like this:
static const uint32 AllTypes = static_cast<uint32>(-1);
What exactly does this do? How can the same be accomplished in C#?
On systems using two’s complement, casting
-1to unsigned gives the highest value an unsigned number can represent.In C# you can use
unchecked((UInt32)-1)or better:UInt32.MaxValue. This is well defined behavior, and works on all CPU architectures.According to the thread rve linked, casting
-1to unsigned results in all bits being set on all architectures in C++.