#defining constants in C++

Question

In various C code, I see constants defined like this:

#define T 100

Whereas in C++ examples, it is almost always:

const int T =         


        

Answer 1

Preprocessor macros do not respect the scope - it's a simple text substitution - while static const int blah = 1; can be enclosed in a namespace. The compiler will still optimize both cases (unless you take address of that variable) but it's type- and scope-safe.