28 Numerics library [numerics]

28.6 Numeric arrays [numarray]

28.6.10 valarray range access [valarray.range]

1
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In the begin and end function templates that follow, unspecified1 is a type that meets the requirements of a mutable Cpp17RandomAccessIterator ([random.access.iterators]) and models contiguous_iterator ([iterator.concept.contiguous]), whose value_type is the template parameter T and whose reference type is T&.
unspecified2 is a type that meets the requirements of a constant Cpp17RandomAccessIterator and models contiguous_iterator, whose value_type is the template parameter T and whose reference type is const T&.
2
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The iterators returned by begin and end for an array are guaranteed to be valid until the member function resize(size_t, T) is called for that array or until the lifetime of that array ends, whichever happens first.
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template<class T> unspecified1 begin(valarray<T>& v); template<class T> unspecified2 begin(const valarray<T>& v);
3
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Returns: An iterator referencing the first value in the array.
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template<class T> unspecified1 end(valarray<T>& v); template<class T> unspecified2 end(const valarray<T>& v);
4
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Returns: An iterator referencing one past the last value in the array.