locking_map.h

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#ifndef META_LOCKING_MAP_H_
#define META_LOCKING_MAP_H_

#include <unordered_map>
#include <memory>
#include <mutex>

#include "util/optional.h"

namespace meta
{
namespace caching
{

template <class Key, class Value>
class locking_map
{
  public:
    locking_map() = default;

    locking_map(locking_map&&);

    locking_map& operator=(locking_map rhs);

    void swap(locking_map& other);

    void insert(const Key& key, const Value& value);

    template <class... Args>
    void emplace(Args&&... args);

    util::optional<Value> find(const Key& key) const;

    using iterator = typename std::unordered_map<Key, Value>::iterator;
    using const_iterator =
        typename std::unordered_map<Key, Value>::const_iterator;

    iterator begin();

    iterator end();

    const_iterator begin() const;

    const_iterator end() const;

  private:
    std::unordered_map<Key, Value> map_;
    mutable std::mutex mutables_;
};
}
}

#include "caching/maps/locking_map.tcc"
#endif