Rust is another compiling language that may replace the position of C/C++ in server filed.
It runs fast and can be written easily comparing with Python/Go. Python is a dynamic language
and is limited in GIL, while Go is limited in its GC. That is reason why I prefer to learning Rust.
Without managing memory by yourself, GC limitation and GIL limitation, I like the feeling of
flying and do what I want. Actual it is a kind of feature of a programming language. In reality,
we are going to choose a proper language when developing a poject according to the condition
that can save cost and a better future of extending.
1.Rust macro:
If we add `!` affter a callee function, we call on a macro. And it is normal function when we call
without `!`.
println!("Hello World")