src/3rdParty/lru-cache/examples/wrap.cpp

/// The MIT License (MIT)
/// Copyright (c) 2016 Peter Goldsborough
///
/// Permission is hereby granted, free of charge, to any person obtaining a copy
/// of this software and associated documentation files (the "Software"), to
/// deal in the Software without restriction, including without limitation the
/// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
/// sell copies of the Software, and to permit persons to whom the Software is
/// furnished to do so, subject to the following conditions:
///
/// The above copyright notice and this permission notice shall be included in
/// all copies or substantial portions of the Software.
///
/// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
/// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
/// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
/// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
/// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
/// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
/// IN THE SOFTWARE.

#include <chrono>
#include <iostream>
#include <thread>

#include "lru/lru.hpp"

using namespace std::chrono_literals;

int f(int x) {
  std::this_thread::sleep_for(1s);
  return x;
}

auto main() -> int {
  // Use a time-to-live of 2 minutes and a
  // capacity of 128 for an LRU::TimedCache
  auto wrapped = LRU::timed_wrap(f, 2min, 128);

  std::cout << "Slow the first time ..." << '\n';
  wrapped(42);

  std::cout << "Fast the second time!" << '\n';
  wrapped(42);
}