Macro hygiene is the concept of macros that work in all contexts; they don't affect and aren't affected by anything around them. Ideally all macros would be fully hygienic, but there are lots of pitfalls and traps that make it all too easy to accidentally write unhygienic macros. This guide attempts to provide a comprehensive resource for writing the most hygienic macros.
First, a little aside on the details of Rust's module system, and specifically paths; it is
The official installation guide (https://wiki.archlinux.org/index.php/Installation_Guide) contains a more verbose description.
| // haversin(θ) function | |
| func hsin(theta float64) float64 { | |
| return math.Pow(math.Sin(theta/2), 2) | |
| } | |
| // Distance function returns the distance (in meters) between two points of | |
| // a given longitude and latitude relatively accurately (using a spherical | |
| // approximation of the Earth) through the Haversin Distance Formula for | |
| // great arc distance on a sphere with accuracy for small distances | |
| // |
| # Install ARCH Linux with encrypted file-system and UEFI | |
| # The official installation guide (https://wiki.archlinux.org/index.php/Installation_Guide) contains a more verbose description. | |
| # Download the archiso image from https://www.archlinux.org/ | |
| # Copy to a usb-drive | |
| dd if=archlinux.img of=/dev/sdX bs=16M && sync # on linux | |
| # Boot from the usb. If the usb fails to boot, make sure that secure boot is disabled in the BIOS configuration. | |
| # Set swedish keymap |
