chsvmemex\generating_input_iterator.cpp

Demonstrates usage of the generating_input_iterator adapter.

#include <vector>
#include <functional>
#include <chsvlib/chsvmemex.h>
#include <iterator>
 
using namespace Chusov::Memory;
 
std::vector<unsigned> fill_generate(std::size_t count)
{
    std::vector<unsigned> v;
    unsigned val = 0;
    std::copy_n(generating_input_iterator<std::function<unsigned()>>([&val]() mutable {return ++val;}), count, std::back_inserter(v));
    return v;
}
 
std::vector<unsigned> fill_generate_cpp17(std::size_t count)
{
    std::vector<unsigned> v;
    unsigned val = 10;
    std::copy_n(generating_input_iterator([&val]() mutable {return val--;}), count, std::back_inserter(v)); //C++17 due to the deduced type of the lambda
    return v;
}
 
#include <iostream>
int main(int argc, char** argv)
{
    auto v = fill_generate(10);
    for (const auto& elem:v)
        std::cout << elem << ' ';
    std::cout << '\n';
    v = fill_generate_cpp17(10);
    for (const auto& elem:v)
        std::cout << elem << ' ';
    std::cout << '\n';
    return 0;
}
 
/*
Output:
>1 2 3 4 5 6 7 8 9 10 
>10 9 8 7 6 5 4 3 2 1 
>
*/