Currently only covers what is needed to keep code compiling, plus
everything caps/structure/tags related.
This avoids unnecessary heap allocations for adding the NUL-terminator
of C strings, and especially makes caps/structure handling as efficient
as in C.
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/-/merge_requests/1190>
These assertions can only trigger because of bugs in the bindings
implementation or in the C code and not because of bugs in calling code,
so using debug assertions is perfectly fine for them and reduces the
number of assertions inlined everywhere in release builds.
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/-/merge_requests/1188>
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();
```
Previous proposition for constructing specific formatted values was
to use an operation such as `42 * Default::ONE` which, in retrospect,
doesn't seem idiomatic.
This commit adds `from_u64` and `from_usize` constructors for most
formatted values. Having `from_usize` is convenient when dealing with
quantities related to containers indices or length.
This also fixes the `Percent` from float constructors from which was
derived the `ONE` constant as well as previous display implementation.
Also removed the `pub` specifier for `Undefined` inner value. It wasn't
removed in a previous commit as `Undefined` can use the full range of
the inner type. But now, it seems preferable not to expose the inner
value for proper encapsulation and so as to reduce the differences with
other formatted values (kind of least astonishment principle).
... users would be able to bypass the range checks and build a
defined Rust value which would be interpreted as `None` in C code.
Added format module examples for formatted values constructions.
getters/setters are already generated for the `Aggregator` base class
and the property in the subclass is not really needed here. It also
causes problems with trait resolution as the getter/setter functions
will exist twice.
When I introduced the 'ser_de' feature, I couldn't find a way to
name it 'serde' while also make it pull the optional 'serde'
crate together with the other related dependencies.
With rustc >= 1.60 we can use 'dep:serde' to refer to the 'serde'
dependency as part of the 'serde' feature.
