cpp-course/modules/09_cpp11/src/auto_and_range_for.cpp

#include "auto_and_range_for.hpp"

#include <algorithm>

namespace cpp11 {

auto double_values(const std::vector<int>& input) -> std::vector<int> {
    auto result = std::vector<int>{};
    result.reserve(input.size());
    std::ranges::for_each(input, [&result](const int value) { result.push_back(value * 2); });
    return result;
}

auto join_with_auto(const std::vector<std::string>& parts) -> std::string {
    auto result = std::string{};
    std::ranges::for_each(parts, [&result](const std::string& part) { result += part; });
    return result;
}

auto count_if_positive(const std::vector<int>& input) -> int {
    auto count = 0;
    std::ranges::for_each(input, [&count](const int value) { if (value > 0) ++count; });
    return count;
}

}  // namespace cpp11