day 6

Summary:

Continuing practicing the Rust Syntax. Nothing major. The "do something meaningful day is still in the future"

Rust by Practice

• Learned about "an inner lint attribute that allows the overflowing_literals lint".
• Sometimes the "usual behaviour" can be achieved using unsafe code. Rust wants to protect us.
• *mut i32 is a raw mutable pointer to an i32.
• If we want to use let u:U = T.into() or let u: U = U::from(T) we should do the: impl From<T> for U
• Learned about the TryFrom and TryInto that return a Result and can be use for conversions that might fail.
• We can shorten and extend the lifetimes with the transmute
• map has normal return inside the closure, and_then has Result return inside the closure.
• A single Cargo package managed by one Cargo.toml can contain multiple crate targets: at most one library crate from src/lib.rs, one default binary crate from src/main.rs usually named after the package, and additional binary crates from files in src/bin/*.rs.
• We can control the visibility of stuff with: pub(in crate::a)
• 12.1: Type Conversion - as
• 12.2: Type Conversion - from/into
• 12.3: Type Conversion - others
• 13.1: Result and panic - panic!
• 13.2: Result and panic - result and ?
• 14.1: Crate and Module - package and crate
• 14.2: Crate and Module - module
• 14.3: Crate and Module - advanced use and pub