std::mask_array<T>::operator=
void operator=( const T& value ) const; |
(1) | |
void operator=( const std::valarray<T>& val_arr ) const; |
(2) | |
const mask_array& operator=( const mask_array& sl_arr) const; |
(3) | (since C++11) |
Assigns values to all referred elements.
1) Assigns
value to all of the elements.
2) Assigns the elements of
val_arr to the referred to elements of
*this.
3) Assigns the selected elements from
sl_arr to the referred to elements of
*this.
Parameters
| value | - | a value to assign to all of the referred elements |
| val_arr | - | std::valarray to assign |
| sl_arr | - | std::mask_array to assign |
Return value
1-2) (none)
3)
*this
Exceptions
May throw implementation-defined exceptions.
Example
#include <iomanip>
#include <iostream>
#include <valarray>
void print(std::valarray<int> const& v)
{
for (int e : v) std::cout << std::setw(2) << e << ' ';
std::cout << '\n';
}
int main()
{
const auto init = {1, 2, 3, 4, 5, 6, 7, 8};
std::valarray<int> v;
v = init;
v[(v % 2) == 0] = 0; // (1)
print(v);
v = init;
v[(v % 2) == 1] = std::valarray<int>{-1, -2, -3, -4}; // (2)
print(v);
v = init;
v[(v % 2) == 0] = v[(v % 2) == 1]; // (3)
print(v);
}
Output:
1 0 3 0 5 0 7 0 -1 2 -2 4 -3 6 -4 8 1 1 3 3 5 5 7 7
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