fuzzy_template.cc

#include <iostream>
#include <map>
#include <unordered_map>

template<typename Key, typename Value>
using stdmap = std::map<Key, Value>;

template<typename Key, typename Value>
using stdumap = std::unordered_map<Key, Value>;

template<typename Key,
         typename Real = double,
         template<typename, typename...> class MapType = stdmap>
using fuzzy_set = MapType<Key, Real>;

template<typename FuzzySet>
auto fuzzy_mem(FuzzySet const& fz, typename FuzzySet::key_type key) -> typename FuzzySet::mapped_type {
  auto const it = fz.find(key);
  return it != fz.end()? it->second : 0;
}

auto main() -> int {
  auto const fs = fuzzy_set<int, double>{{4, 0.6}, {6, 0.9}, {1, 0.1}, {3, 0.8}};
  std::cout << fuzzy_mem(fs, 4) << '\n' << fuzzy_mem(fs, -1) << '\n';
  return 0;
}