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.
- The `GST_FORMAT_PERCENT_SCALE` was not used to compute the value
to display.
- Added `Display` examples in the format module documentation.
- Simplified `glib_newtype_display` macro.
The `Signed` version for `GenericFormattedValue` was implemented as
`Signed<GenericFormattedValue>`, which failed to represent properly
the `None` variants when applicable and could represent inconsistent
`Signed` variant combined with `GenericFormattedValue` formats which
are internaly represented as signed integers.
Some operations were implemented on types that wouldn't result in
the expected physical unit. E.g.:
- `ClockTime / ClockTime` results in a unit-less factor.
- `u64 / ClockTime` would result in a `1 / ClockTime`. Since we don't
use any `Frequency` type, this operation is removed. Users should
use the `ClockTime` accessors to compute the expected value.
This commit also adds:
- multiplications with integers as the left hand side operands.
- `Partial{Eq,Ord} for `Signed<T>` with `T` as left hand side operand.
- `opt_add` / `opt_sub` for `Signed<T>` with `T` as left or right hand
side operands.
- missing tests for `Partial{Eq,Ord}` and `OptionOrd`.
This implementation can interfere with unrelated code and was removed:
- `Signed<usize>.` `PartialOrd` makes existing code computing the len
of slices needing type annotation because the len is later used in
a comparison for which the compiler is unable to determine if
the len is `Signed<usize>` or `usize`.
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.
The `SpecificFormattedValue` types are newtypes of `u64` or `u32`
and they all implement `Copy`. It shouldn't be needed to implement
operations on `&Type` nor `&inner_type`.
The functions `into_{signed,positive,negative}` used to be implemented
on the `FormattedValue` trait for convenience. This was wrong for the
following reasons:
- They aren't specific to `FormattedValue`s: they can also be
implemented for regular unsigned integers such as `u64`, `usize` or
`u32`.
- They were implemented for `format::Undefined` and all variants of
`GenericFormattedValue`, some of which are already signed.
This commit introduces the new trait `UnsignedIntoSigned`, which makes
it possible to fix both of the above problems.
Users can build a `Signed` from an `Undefined`, an `i64`, `isize` or
`i32` thanks to the `From` trait implementations.
Previous implementation for the glib format new types built a
`String` for the displayable value. This commit uses `fmt`
mechanisms so as to limit useless allocations.
