# std::seed_seq::size

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< cpp‎ | numeric‎ | random‎ | seed seq

std::size_t size() const noexcept; |  | (since C++11)

Returns the size of the stored initial seed sequence.

### Parameters

(none)

### Return value

The size of the private container that was populated at construction time.

### Complexity

Constant time.

### Example

Run this code

    #include <iostream>
    #include <random>

    int main()
    {
        std::seed_seq s1 = {-1, 0, 1};
        std::cout << s1.size() << '\n';
    }

Output:

    3

### Defect report

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR | Applied to | Behavior as published | Correct behavior
--- | --- | --- | ---
LWG 2440 | C++11 | `seed_seq::size` was not required to be noexcept | required

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