//
// libsemigroups - C++ library for semigroups and monoids
// Copyright (C) 2020 James D. Mitchell
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
#include "libsemigroups/timer.hpp"
#include <chrono>
// for nanoseconds, duration_cast, minutes, operator>
#include <cstddef>
// for size_t
#include <string>
// for string
#include "libsemigroups/string.hpp" // for to_string
namespace libsemigroups {
namespace detail {
namespace {
template <
typename T>
bool string_it(std::string& str,
std::chrono::nanoseconds& elapsed,
std::string unit,
size_t threshold) {
T x = std::chrono::duration_cast<T>(elapsed);
if (x > T(threshold)) {
str += detail::to_string(x.count()) + unit;
elapsed -= std::chrono::nanoseconds(x);
return true;
}
return false;
}
}
// namespace
// String containing the somewhat human readable amount of time, this is
// primarily intended for testing purposes
std::string Timer::string(std::chrono::nanoseconds elapsed) {
std::string out;
if (string_it<std::chrono::hours>(out, elapsed,
"h", 0)) {
string_it<std::chrono::minutes>(out, elapsed,
"m", 0);
return out;
}
else if (string_it<std::chrono::minutes>(out, elapsed,
"m", 0)) {
string_it<std::chrono::seconds>(out, elapsed,
"s", 0);
return out;
}
else if (string_it<std::chrono::milliseconds>(out, elapsed,
"ms", 9)) {
return out;
}
else if (string_it<std::chrono::microseconds>(
out, elapsed,
"\u03BCs", 9)) {
return out;
}
else {
string_it<std::chrono::nanoseconds>(out, elapsed,
"ns", 0);
return out;
}
}
}
// namespace detail
}
// namespace libsemigroups
