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Merge pull request #430 from ascherer/fix-note-on-ranges

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Fix note on ranges.
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Gabriel Dos Reis 2015-12-04 05:31:22 -08:00
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@ -2540,7 +2540,7 @@ Informal/non-explicit ranges are a source of errors.
##### Note
Ranges are extremely common in C++ code. Typically, they are implicit and their correct use is very hard to ensure. In particular, given a pair of arguments `(p, n)` designating an array [`p`:`p+n`), it is in general impossible to know if there really are n elements to access following `*p`. `span<T>` and `span_p<T>` are simple helper classes designating a [p:q) range and a range starting with p and ending with the first element for which a predicate is true, respectively.
Ranges are extremely common in C++ code. Typically, they are implicit and their correct use is very hard to ensure. In particular, given a pair of arguments `(p, n)` designating an array [`p`:`p+n`), it is in general impossible to know if there really are `n` elements to access following `*p`. `span<T>` and `span_p<T>` are simple helper classes designating a [`p`:`q`) range and a range starting with `p` and ending with the first element for which a predicate is true, respectively.
##### Note