iota
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| Category: algorithms |
Component type: function |
Prototype
template <class ForwardIterator, class T>
void iota(ForwardIterator first, ForwardIterator last, T value);
Description
Iota assigns sequentially increasing values to a range. That is,
it assigns value to *first, value + 1 to *(first + 1)
and so on. In general, each iterator i in the range [first, last)
is assigned value + (i - first). [1]
Definition
Defined in the standard header numeric, and in the nonstandard
backward-compatibility header algo.h. This function is an SGI
extension; it is not part of the C++ standard.
Requirements on types
-
ForwardIterator is a model of Forward Iterator.
-
ForwardIterator is mutable.
-
T is Assignable.
-
If x is an object of type T, then x++ is defined.
-
T is convertible to ForwardIterator's value type.
Preconditions
-
[first, last) is a valid range.
Complexity
Linear. Exactly last - first assignments.
Example
int main()
{
vector<int> V(10);
iota(V.begin(), V.end(), 7);
copy(V.begin(), V.end(), ostream_iterator<int>(cout, " "));
cout << endl;
}
Notes
[1]
The name iota is taken from the programming language APL.
See also
fill, generate, partial_sum
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