std::acos(std::valarray)

From Cppreference

For each element in va computes arc cosine of the value of the element. This is done by applying acos (unqualified) function.

[edit] Parameters

[edit] Return value

Value array containing arc cosines of the values in va.

[edit] Notes

Unqualified function (acos) is used to perform the computation. If such function is not available, std::acos is used due to argument dependent lookup.

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.

[edit] Equivalent function

template< class T >
valarray<T> acos( const valarray<T>& va )
{
    valarray<T> other = va;
    for (T &i : other) {
        i = acos(i);
    }
}

[edit] Example