[alg.generate]

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template<class ForwardIterator, class Generator>
  constexpr void generate(ForwardIterator first, ForwardIterator last,
                          Generator gen);
template<class ExecutionPolicy, class ForwardIterator, class Generator>
  void generate(ExecutionPolicy&& exec,
                ForwardIterator first, ForwardIterator last,
                Generator gen);

template<class OutputIterator, class Size, class Generator>
  constexpr OutputIterator generate_n(OutputIterator first, Size n, Generator gen);
template<class ExecutionPolicy, class ForwardIterator, class Size, class Generator>
  ForwardIterator generate_n(ExecutionPolicy&& exec,
                             ForwardIterator first, Size n, Generator gen);

Effects: The generate algorithms invoke the function object gen and assign the return value of gen through all the iterators in the range [first, last).

The generate_n algorithms invoke the function object gen and assign the return value of gen through all the iterators in the range [first, first + n) if n is positive, otherwise they do nothing.

23 Algorithms library [algorithms]

23.6 Mutating sequence operations [alg.modifying.operations]

23.6.7 Generate [alg.generate]