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Exzap 2022-08-22 22:21:23 +02:00
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src/util/helpers/MapAdaptor.h Normal file
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#pragma once
// https://ideone.com/k0H8Ei
#include <iostream>
#include <map>
#include <boost/iterator/transform_iterator.hpp>
template <typename T, typename F>
struct map_adaptor
{
map_adaptor(const T& t, const F& f) : _t(t), _f(f) {}
map_adaptor(map_adaptor& a) = delete;
map_adaptor(map_adaptor&& a) = default;
[[nodiscard]] auto begin() { return boost::make_transform_iterator(_t.begin(), _f); }
[[nodiscard]] auto end() { return boost::make_transform_iterator(_t.end(), _f); }
[[nodiscard]] auto cbegin() const { return boost::make_transform_iterator(_t.cbegin(), _f); }
[[nodiscard]] auto cend() const { return boost::make_transform_iterator(_t.cend(), _f); }
protected:
const T& _t;
F _f;
};
template <typename T, typename F>
auto get_map_adaptor(const T& t, const F& f) { return map_adaptor<T, F>(t, f); }
template <typename T>
auto get_keys(const T& t) { return get_map_adaptor(t, [](const auto& p) { return p.first; }); }
template <typename T>
auto get_values(const T& t) { return get_map_adaptor(t, [](const auto& p) { return p.second; }); }