std::slice_array<T>::operator=
void operator=( const T& value ) const; |
(1) | |
void operator=( const std::valarray<T>& val_arr ) const; |
(2) | |
const slice_array& operator=( const slice_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::slice_array to assign |
Return value
1-2) (none)
3)
*this
Exceptions
May throw implementation-defined exceptions.
Example
#include <iostream>
#include <valarray>
void print(char const* remark, std::valarray<int> const& v = {})
{
std::cout << remark;
if (v.size() != 0) {
std::cout << ":";
for (int e : v) std::cout << ' ' << e;
}
std::cout << '\n';
}
int main()
{
std::valarray<int> v1{1,2,3,4,5,6,7,8};
std::slice_array<int> s1 = v1[std::slice(1, 4, 2)];
print("v1", v1);
print("s1", s1);
print("\n(1) operator=( const T& )");
print("s1 = 42");
s1 = 42; // (1)
print("s1", s1);
print("v1", v1);
print("\n(2) operator=( const std::valarray<T>& )");
std::valarray<int> v2{10,11,12,13,14,15};
print("v2", v2);
print("s1 = v2");
s1 = v2; // (2)
print("s1", s1);
print("v1", v1);
print("\n(3) operator=( const slice_array& )");
v1 = {1,2,3,4,5,6,7,8};
std::slice_array<int> s2 = v1[std::slice(0, 4, 1)];
std::slice_array<int> s3 = v2[std::slice(1, 4, 1)];
print("v1", v1);
print("v2", v2);
print("s2", s2);
print("s3", s3);
print("s2 = s3");
s2 = s3; // (3) Note: LHS and RHS must have same size.
print("s2", s2);
print("v1", v1);
}
Output:
v1: 1 2 3 4 5 6 7 8 s1: 2 4 6 8 (1) operator=( const T& ) s1 = 42 s1: 42 42 42 42 v1: 1 42 3 42 5 42 7 42 (2) operator=( const std::valarray<T>& ) v2: 10 11 12 13 14 15 s1 = v2 s1: 10 11 12 13 v1: 1 10 3 11 5 12 7 13 (3) operator=( const slice_array& ) v1: 1 2 3 4 5 6 7 8 v2: 10 11 12 13 14 15 s2: 1 2 3 4 s3: 11 12 13 14 s2 = s3 s2: 11 12 13 14 v1: 11 12 13 14 5 6 7 8
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