Книга: Standard Template Library Programmer

Generalized numeric algorithms

iota

Category: algorithms

Component type: function

template <class ForwardIterator, class T>
void iota(ForwardIterator first, ForwardIterator last, T value);

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]

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.

• 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.

• [first, last) is a valid range.

Linear. Exactly last – first assignments.

int main() {
 vector<int> V(10);
 iota(V.begin(), V.end(), 7);
 copy(V.begin(), V.end(), ostream_iterator<int>(cout, " "));
 cout << endl;
}

[1] The name iota is taken from the programming language APL.

fill, generate, partial_sum

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