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Showing content from https://timsong-cpp.github.io/cppwp/n4140/valarray.cons below:

[valarray.cons]

valarray();

Effects: Constructs an object of class valarray<T>283 which has zero length.284

explicit valarray(size_t);

The array created by this constructor has a length equal to the value of the argument. The elements of the array are value-initialized ([dcl.init]).

valarray(const T&, size_t);

The array created by this constructor has a length equal to the second argument. The elements of the array are initialized with the value of the first argument.

valarray(const T*, size_t);

The array created by this constructor has a length equal to the second argument n. The values of the elements of the array are initialized with the first n values pointed to by the first argument.285 If the value of the second argument is greater than the number of values pointed to by the first argument, the behavior is undefined.

valarray(const valarray<T>&);

The array created by this constructor has the same length as the argument array. The elements are initialized with the values of the corresponding elements of the argument array.286

valarray(valarray<T>&& v) noexcept;

The array created by this constructor has the same length as the argument array. The elements are initialized with the values of the corresponding elements of the argument array.

valarray(initializer_list<T> il);

Effects: Same as valarray(il.begin(), il.size()).

valarray(const slice_array<T>&); valarray(const gslice_array<T>&); valarray(const mask_array<T>&); valarray(const indirect_array<T>&);

These conversion constructors convert one of the four reference templates to a valarray.

~valarray();

The destructor is applied to every element of *this; an implementation may return all allocated memory.

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