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<tbody> </tbody> template< class T > valarray<T> abs( const valarray<T>& va ); |
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va. (
abs) . , std::abs .:
Unqualified function (
abs) is used to perform the computation. If such function is not available, std::abs is used due to argument dependent lookup. std::valarray. , :
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The function can be implemented with the return type different from std::valarray. In this case, the replacement type has the following properties:
- std::valarray,
std::slice_array,std::gslice_array,std::mask_arraystd::indirect_array.:std::valarray,std::slice_array,std::gslice_array,std::mask_arrayandstd::indirect_arraycan be constructed from the replacement type. - ,
const std::valarray&.:All functions accepting a arguments of typeconst std::valarray&should also accept the replacement type. const std::valarray&const std::valarray&.:All functions accepting two arguments of typeconst std::valarray&should accept every combination ofconst std::valarray&and the replacement type.
template< class T >
valarray<T> abs( const valarray<T>& va )
{
valarray<T> other = va;
for (T &i : other) {
i = abs(i);
}
return other; // proxy object may be returned
}
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#include <valarray>
#include <iostream>
int main()
{
std::valarray<int> v{1, -2, 3, -4, 5, -6, 7, -8};
std::valarray<int> v2 = std::abs(v);
for(auto n : v2) {
std::cout << n << ' ';
}
std::cout << '\n';
}
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