std::valarray::apply

 

C++

Language

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Utilities library

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Containers library

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Regular expressions library (C++11)

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Numerics library

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Member functions
valarray::valarray valarray::~valarray valarray::operator= valarray::operator[] valarray::swap valarray::size valarray::resize valarray::sum valarray::min valarray::max valarray::shift valarray::cshift valarray::apply	valarray::operator+ valarray::operator- valarray::operator~ valarray::operator! valarray::operator*= valarray::operator/= valarray::operator%= valarray::operator+= valarray::operator-= valarray::operator^= valarray::operator&= valarray::operator|= valarray::operator<<= valarray::operator>>=
Non-member functions
swap (C++11) begin (C++11) end (C++11) abs exp log log10 pow sqrt sin cos tan asin acos atan atan2 sinh cosh tanh	operator* operator/ operator% operator+ operator- operator^ operator& operator| operator<< operator>> operator&& operator operator== operator!= operator< operator> operator<= operator>=
Helper classes
slice_array gslice_array indirect_array	slice gslice mask_array

 

valarray<T> apply( T func(T) ) const;
valarray<T> apply( T func(const T&) ) const;

Returns a new valarray of the same size with values which are acquired by applying function func to the previous values of the elements.

Parameters

func

-

function to apply to the values

Return value

The resulting valarray with values acquired by applying function func.

Notes

The function can be implemented with the return type different from std::valarray. In this case, the replacement type has the following properties:

• All const member functions of std::valarray are provided.
• std::valarray, std::slice_array, std::gslice_array, std::mask_array and std::indirect_array can be constructed from the replacement type.
• All functions accepting a arguments of type const std::valarray& should also accept the replacement type.
• All functions accepting two arguments of type const std::valarray& should accept every combination of const std::valarray& and the replacement type.

Example

calculates and prints the first 10 factorials

#include <iostream>
#include <valarray>
#include <cmath>
 
int main()
{
    std::valarray<int> v = {1,2,3,4,5,6,7,8,9,10};
    v = v.apply([](int n)->int {
                    return std::round(std::tgamma(n+1));
                });
    for(auto n : v) {
        std::cout << n << ' ';
    }
    std::cout << '\n';
}

Output:

1 2 6 24 120 720 5040 40320 362880 3628800

See also

for_each	applies a function to a range of elements (function template)