refactor(metrics/histogram): 🎂 constructor accepts IntoIterator
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this is a very small, **non-breaking**, alteration to the signature of
`Histogram`'s constructor.
rather than accepting an `impl Iterator`, this commit changes the
parameter of `Histogram::new()` to be an `impl IntoIterator` instead.
this does not affect the existing contract because of the blanket
`impl<I: Iterator> IntoIterator for I` implementation provided by the
standard library.
by accepting `IntoIterator` however, callers providing a collection such
as a `[f64; 5]` array or a `Vec<f64>` vector do not need to invoke
`into_iter()` themselves at the call-site.
```rust
// now, constructing a histogram needn't involve `into_iter()`...
use prometheus_client::metrics::histogram::Histogram;
let histogram = Histogram::new([10.0, 100.0, 1_000.0]);
```
this leans on the same sugar used by `for {}` loops, see the relevant
section of the `std::iter` documentation here:
<https://doc.rust-lang.org/stable/std/iter/index.html#for-loops-and-intoiterator>
no changes are needed within `Histogram::new()` because we already call
`into_iter()` on the provider iterator when appending `f64::MAX` and
collecting the buckets into a `Vec<_>`.
Signed-off-by: katelyn martin <[email protected]>
cratelyn
changed the title
IntoIteratorIntoIterator
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this is a very small, non-breaking, alteration to the signature of
Histogram's constructor.rather than accepting an
impl Iterator, this commit changes the parameter ofHistogram::new()to be animpl IntoIteratorinstead. this does not affect the existing contract because of the blanketimpl<I: Iterator> IntoIterator for Iimplementation provided by the standard library.by accepting
IntoIteratorhowever, callers providing a collection such as a[f64; 5]array or aVec<f64>vector do not need to invokeinto_iter()themselves at the call-site.this leans on the same sugar used by
for {}loops, see the relevant section of thestd::iterdocumentation here:https://doc.rust-lang.org/stable/std/iter/index.html#for-loops-and-intoiterator
no changes are needed within
Histogram::new()because we already callinto_iter()on the provider iterator when appendingf64::MAXand collecting the buckets into aVec<_>.