map2d.h

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#pragma once
#include <map>
 
namespace hgps {
 
template <class TROW, class TCOL, class TCell> class Map2d {
  public:
    using IteratorType = typename std::map<TROW, std::map<TCOL, TCell>>::iterator;
 
    using ConstIteratorType = typename std::map<TROW, std::map<TCOL, TCell>>::const_iterator;
 
    Map2d() = default;
 
    Map2d(std::map<TROW, std::map<TCOL, TCell>> &&data) noexcept : table_{std::move(data)} {}
 
    bool empty() const noexcept { return table_.empty(); }
 
    std::size_t size() const noexcept { return rows() * columns(); }
 
    std::size_t rows() const noexcept { return table_.size(); }
 
    std::size_t columns() const noexcept {
        if (table_.size() > 0) {
 
            // Assuming that inner map has same size.
            return table_.begin()->second.size();
        }
 
        return 0;
    }
 
    bool contains(const TROW &row_key) const { return table_.contains(row_key); }
 
    bool contains(const TROW &row_key, const TCOL &col_key) const {
        if (table_.contains(row_key)) {
            return table_.at(row_key).contains(col_key);
        }
 
        return false;
    }
 
    std::map<TCOL, TCell> &row(const TROW &row_key) { return table_.at(row_key); }
 
    const std::map<TCOL, TCell> &row(const TROW &row_key) const { return table_.at(row_key); }
 
    TCell &at(const TROW &row_key, const TCOL &col_key) { return table_.at(row_key).at(col_key); }
 
    const TCell &at(const TROW &row_key, const TCOL &col_key) const {
        return table_.at(row_key).at(col_key);
    }
 
    IteratorType begin() noexcept { return table_.begin(); }
 
    IteratorType end() noexcept { return table_.end(); }
 
    ConstIteratorType begin() const noexcept { return table_.cbegin(); }
 
    ConstIteratorType end() const noexcept { return table_.cend(); }
 
    ConstIteratorType cbegin() const noexcept { return table_.cbegin(); }
 
    ConstIteratorType cend() const noexcept { return table_.cend(); }
 
  private:
    std::map<TROW, std::map<TCOL, TCell>> table_;
};
} // namespace hgps