Defined in header <valarray> | ||
---|---|---|
template< class T > class mask_array; |
std::gslice_array
is a helper template used by std::mask_array
subscript operator. It has reference semantics to a subset of the array specified by an mask array (std::valarray<bool>
object).
Member types
Type | Definition |
---|---|
value_type | T |
Member functions
constructs a mask_array (public member function) | |
(destructor)
| destroys a mask_array (public member function) |
operator=
| assigns contents (public member function) |
performs arithmetic operation on the array referred by mask. (public member function) |
Example
#include <iostream> #include <valarray> int main() { std::valarray<int> data = {0,1,2,3,4,5,6,7,8,9}; std::cout << "Initial valarray: "; for(int n: data) std::cout << n << ' '; std::cout << '\n'; data[data > 5] = -1; // the type of data>5 is std::valarray<bool> // the type of data[data>5] is std::mask_array<int> std::cout << "After v[v>5]=-1: "; for(int n: data) std::cout << n << ' '; std::cout << '\n'; }
Output:
Initial valarray: 0 1 2 3 4 5 6 7 8 9 After v[v>5]=-1: 0 1 2 3 4 5 -1 -1 -1 -1
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