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// Copyright 2015, Tobias Hermann and the FunctionalPlus contributors.
// https://github.com/Dobiasd/FunctionalPlus
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#include <fplus/fplus.hpp>
#include <range/v3/all.hpp>
const auto times_3 = [](int i){return 3 * i;};
const auto is_odd_int = [](int i){return i % 2 == 0;};
const auto as_string_length = [](int i){return std::to_string(i).size();};
int main()
{
const auto times_3 = [](int i){return 3 * i;};
const auto is_odd_int = [](int i){return i % 2 == 0;};
const auto as_string_length = [](int i){return std::to_string(i).size();};
typedef std::chrono::time_point<std::chrono::system_clock> Time;
for (int i = 0; i < 3; ++i)
{
// FunctionalPlus
Time startTimeFPlus = std::chrono::system_clock::now();
using namespace fplus;
const auto result_fplus = fwd::apply(
numbers(0, 15000000)
, fwd::transform(times_3)
, fwd::drop_if(is_odd_int)
, fwd::transform(as_string_length)
, fwd::sum());
Time endTimeFPlus = std::chrono::system_clock::now();
std::chrono::duration<double> elapsed_s_fplus =
endTimeFPlus - startTimeFPlus;
std::cout << "(check: " << result_fplus <<
"), elapsed time fplus: " << elapsed_s_fplus.count() << "s\n";
// range-v3
Time startTimeRangev3 = std::chrono::system_clock::now();
using namespace ranges;
const auto result_range_v3 =
accumulate(
view::ints(0)
| view::take(15000000)
| view::transform(times_3)
| view::remove_if(is_odd_int)
| view::transform(as_string_length)
, 0);
Time endTimeRangev3 = std::chrono::system_clock::now();
std::chrono::duration<double> elapsed_s_rangev3 =
endTimeRangev3 - startTimeRangev3;
std::cout << "(check: " << result_range_v3 <<
"), elapsed time range-v3: " << elapsed_s_rangev3.count() << "s\n";
}
}
|
