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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/../algorithm/generate.html below:

std::generate - cppreference.com

template< class ForwardIt, class Generator >
void generate( ForwardIt first, ForwardIt last, Generator g );

1) Assigns each element in range [first, last) a value generated by the given function object g.

2) Same as (1), but executed according to policy.

This overload participates in overload resolution only if all following conditions are satisfied:

The signature of the function should be equivalent to the following:

The type Ret must be such that an object of type ForwardIt can be dereferenced and assigned a value of type Ret. ​

Exactly std::distance(first, last) invocations of g() and assignments.

The overload with a template parameter named ExecutionPolicy reports errors as follows:

• If execution of a function invoked as part of the algorithm throws an exception and ExecutionPolicy is one of the standard policies, std::terminate is called. For any other ExecutionPolicy, the behavior is implementation-defined.
• If the algorithm fails to allocate memory, std::bad_alloc is thrown.

template<class ForwardIt, class Generator>
constexpr //< since C++20
void generate(ForwardIt first, ForwardIt last, Generator g)
{
    for (; first != last; ++first)
        *first = g();
}

#include <algorithm>
#include <iostream>
#include <vector>
 
void println(std::string_view fmt, const auto& v)
{
    for (std::cout << fmt; const auto& e : v)
        std::cout << e << ' ';
    std::cout << '\n';
};
 
 
int f()
{
    static int i;
    return ++i;
}
 
int main()
{
    std::vector<int> v(5);
 
    std::generate(v.begin(), v.end(), f);
    println("v: ", v);
 
    // Initialize with default values 0,1,2,3,4 from a lambda function
    // Equivalent to std::iota(v.begin(), v.end(), 0);
    std::generate(v.begin(), v.end(), [n = 0] () mutable { return n++; });
    println("v: ", v);
}

Output:

v: 1 2 3 4 5
v: 0 1 2 3 4

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