`fugit`

fugit provides a comprehensive library of Duration and Instant for the handling of time in embedded systems, doing all it can at compile time.

This library is a heavily inspired of std::chrono's Duration from C++ which does all it can at compile time.

Aims

no_std library with goals of user-friendliness and performance first
- All methods are const fn that can be (i.e. non-trait methods)
- Use no traits, concrete types all the way for maximum const-ification
- Operations are supported between different bases and backing storages instead of implementing custom traits
- All constants needed for comparing or changing timebase are guaranteed compile time generated
Support for both u32 and u64 backing storage with efficient instruction lowering on MCUs
- On Cortex-M3 and up: no soft-impls pulled in for both u32 and u64 except when changing base on u64
- Comparisons on u32 and u64 do not use division, only changing base with all constants calculated at compile time
Selection of base happens at compile time
- A common problem is that run time changing of base robs us of a lot of optimization opportunities, but since there are no traits and short-hands select the correct base at compile time.