26 Numerics library [numerics]

26.7 Numeric arrays [numarray]

26.7.2 Class template valarray [template.valarray]

26.7.2.8 Member functions [valarray.members]

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void swap(valarray& v) noexcept;
1
#
Effects: *this obtains the value of v.
v obtains the value of *this.
2
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Complexity: Constant.
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size_t size() const;
3
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Returns: The number of elements in the array.
4
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Complexity: Constant time.
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T sum() const;
5
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Mandates: operator+= can be applied to operands of type T.
6
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Preconditions: size() > 0 is true.
7
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Returns: The sum of all the elements of the array.
If the array has length 1, returns the value of element 0.
Otherwise, the returned value is calculated by applying operator+= to a copy of an element of the array and all other elements of the array in an unspecified order.
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T min() const;
8
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Preconditions: size() > 0 is true.
9
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Returns: The minimum value contained in *this.
For an array of length 1, the value of element 0 is returned.
For all other array lengths, the determination is made using operator<.
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T max() const;
10
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Preconditions: size() > 0 is true.
11
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Returns: The maximum value contained in *this.
For an array of length 1, the value of element 0 is returned.
For all other array lengths, the determination is made using operator<.
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valarray shift(int n) const;
12
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Returns: A valarray of length size(), each of whose elements I is (*this)[I + n] if I + n is non-negative and less than size(), otherwise T().
[Note
:
If element zero is taken as the leftmost element, a positive value of n shifts the elements left n places, with zero fill.
— end note
]
13
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[Example
:
If the argument has the value -2, the first two elements of the result will be value-initialized; the third element of the result will be assigned the value of the first element of the argument; etc.
— end example
]
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valarray cshift(int n) const;
14
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Returns: A valarray of length size() that is a circular shift of *this.
If element zero is taken as the leftmost element, a non-negative value of n shifts the elements circularly left n places and a negative value of n shifts the elements circularly right places.
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valarray apply(T func(T)) const; valarray apply(T func(const T&)) const;
15
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Returns: A valarray whose length is size().
Each element of the returned array is assigned the value returned by applying the argument function to the corresponding element of *this.
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void resize(size_t sz, T c = T());
16
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Effects: Changes the length of the *this array to sz and then assigns to each element the value of the second argument.
Resizing invalidates all pointers and references to elements in the array.