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gst/format: introduce Constructor traits

Merged gst/format: introduce Constructor traits
fengalin/gstreamer-rs:format-constructor-traits into main
Merged François Laignel requested to merge fengalin/gstreamer-rs:format-constructor-traits into main
  1. Oct 18, 2022
    • François Laignel's avatar
      gst/format: make `from_u64` constructors `const` · 49faa03c
      François Laignel authored 
      This commit makes the formatted values' main constructors `const`,
so that they can be used in constant definitions.

`from_usize` constructors can't be made const because `try_into`
can't be used in `const` functions as of rustc 1.64.0. Same for
`Percent::from_ratio`: floating point arithmetic is not allowed.
      49faa03c
    • François Laignel's avatar
      gst/format: introduce Constructor traits · 384783b2
      François Laignel authored 
      Introduce a set of Constructor traits which are implemented on
integer of float depending on the formatted values. This traits
allows building formatted values using expressions such as:

```rust
let buffer_nb = 20.buffers();
let size = 42.k_bytes();
let duration = 15.minutes() + 30.seconds();
let quantity = 42.default_format();
let progress = 20.percent();
let progress = 0.2.percent_ratio();
```
      384783b2