BLI_multi_value_map.hh

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/* SPDX-FileCopyrightText: 2023 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#pragma once

 
#include "BLI_map.hh"
#include "BLI_struct_equality_utils.hh"
#include "BLI_vector.hh"
 
namespace blender {
 
template<typename Key, typename Value> class MultiValueMap {
 public:
  using size_type = int64_t;
 
 private:
  using MapType = Map<Key, Vector<Value>>;
  MapType map_;
 
 public:
  void add(const Key &key, const Value &value)
  {
    this->add_as(key, value);
  }
  void add(const Key &key, Value &&value)
  {
    this->add_as(key, std::move(value));
  }
  void add(Key &&key, const Value &value)
  {
    this->add_as(std::move(key), value);
  }
  void add(Key &&key, Value &&value)
  {
    this->add_as(std::move(key), std::move(value));
  }
  template<typename ForwardKey, typename ForwardValue>
  void add_as(ForwardKey &&key, ForwardValue &&value)
  {
    Vector<Value> &vector = map_.lookup_or_add_default_as(std::forward<ForwardKey>(key));
    vector.append(std::forward<ForwardValue>(value));
  }
 
  void add_non_duplicates(const Key &key, const Value &value)
  {
    Vector<Value> &vector = map_.lookup_or_add_default_as(key);
    vector.append_non_duplicates(value);
  }

  void add_multiple(const Key &key, Span<Value> values)
  {
    this->add_multiple_as(key, values);
  }
  void add_multiple(Key &&key, Span<Value> values)
  {
    this->add_multiple_as(std::move(key), values);
  }
  template<typename ForwardKey> void add_multiple_as(ForwardKey &&key, Span<Value> values)
  {
    Vector<Value> &vector = map_.lookup_or_add_default_as(std::forward<ForwardKey>(key));
    vector.extend(values);
  }

  Span<Value> lookup(const Key &key) const
  {
    return this->lookup_as(key);
  }
  template<typename ForwardKey> Span<Value> lookup_as(const ForwardKey &key) const
  {
    const Vector<Value> *vector = map_.lookup_ptr_as(key);
    if (vector != nullptr) {
      return vector->as_span();
    }
    return {};
  }

  MutableSpan<Value> lookup(const Key &key)
  {
    return this->lookup_as(key);
  }
  template<typename ForwardKey> MutableSpan<Value> lookup_as(const ForwardKey &key)
  {
    Vector<Value> *vector = map_.lookup_ptr_as(key);
    if (vector != nullptr) {
      return vector->as_mutable_span();
    }
    return {};
  }

  int64_t size() const
  {
    return map_.size();
  }

  bool is_empty() const
  {
    return map_.is_empty();
  }

  typename MapType::ItemIterator items() const
  {
    return map_.items();
  }

  typename MapType::KeyIterator keys() const
  {
    return map_.keys();
  }

  typename MapType::ValueIterator values() const
  {
    return map_.values();
  }
 
  void clear()
  {
    map_.clear();
  }
 
  void clear_and_shrink()
  {
    map_.clear_and_shrink();
  }
 
  BLI_STRUCT_EQUALITY_OPERATORS_1(MultiValueMap, map_)
};
 
}  // namespace blender