function template
<valarray>
std::abs
template<class T> valarray<T> abs (const valarray<T>& x);
Compute absolute value of valarray elements
Returns a valarray containing the absolute values of all the elements of x, in the same order.
The function calls abs (unqualified) for each element.
This function is overloaded in <cstdlib> for integral types (see cstdlib abs), in <cmath> for floating-point types (see cmath abs), and in <complex> for complex numbers (see complex abs).
Parameters
- x
- valarray containing elements of a type for which the unary function abs is defined.
Return value
A valarray object with the absolute values of the elements of x.
Example
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| // abs valarray example #include <iostream> // std::cout #include <cstddef> // std::size_t #include <cstdlib> // std::abs(int) #include <valarray> // std::valarray, std::abs(valarray) int main () { int val[] = {5, 3, -10, 4, -7}; std::valarray<int> foo (val,5); std::valarray<int> bar = abs (foo); std::cout << "foo:"; for (std::size_t i=0; i<foo.size(); ++i) std::cout << ' ' << foo[i]; std::cout << '\n'; std::cout << "bar:"; for (std::size_t i=0; i<bar.size(); ++i) std::cout << ' ' << bar[i]; std::cout << '\n'; return 0; }
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Output:
foo: 5 3 -10 4 -7 bar: 5 3 10 4 7 |