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Added Mike's suggested notes

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hsutter 2017-05-24 11:56:59 -07:00
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@ -112,7 +112,7 @@ void dangerous_process_ints(int* p, size_t n) {
}
~~~
A `span` supports range-`for`:
A `span` supports range-`for` -- note this is zero-overhead and does not need to perform any range check, because the range-`for` loop is is known by construction not to exceed the range's bounds:
~~~cpp
void process_ints(span<int> s) {
@ -122,7 +122,11 @@ void process_ints(span<int> s) {
}
~~~
Note that this is bounds-safe with zero overhead, because there is no range check needed -- the range-`for` loop is known by construction to not exceed the range's bounds.
A `span` also supports normal iteration using `.begin()` and `.end()`.
Note that you cannot compare iterators from different spans, even if they refer to the same array.
An iterator is valid as long as the `span` that it is iterating over exists.
## Element access: "How do I access a single element in a span?"