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#pragma once
#include <vector>
template <typename T>
class Grid
{
public:
using Index = std::size_t;
struct Pos
{
T x, y;
Pos(T x, T y) : x(x), y(y) {}
};
Grid() = default;
Grid(Index width, Index height);
Grid(Index width, Index height, T value);
bool is_valid(Index x, Index y) const;
bool is_valid(Pos pos) const;
Index width() const;
Index height() const;
T operator()(Pos pos) const;
T operator()(Index x, Index y) const;
T& operator()(Pos pos);
T& operator()(Index x, Index y);
std::vector<T> const& getAllEntries() const;
void resize(Index width, Index height);
void assign(Index width, Index height, T value);
void setDefaultValue(T value);
private:
Index _width;
Index _height;
std::vector<T> _entries;
T default_value;
};
template <typename T>
Grid<T>::Grid(Index width, Index height)
: _width(width), _height(height), _entries(_width*_height) {}
template <typename T>
Grid<T>::Grid(Index width, Index height, T value)
: _width(width), _height(height), _entries(_width*_height, value) {}
template <typename T>
bool Grid<T>::is_valid(Index x, Index y) const
{
return x >= 0 && x < _width && y >= 0 && y < _height;
}
template <typename T>
bool Grid<T>::is_valid(Pos pos) const
{
return is_valid(pos.x, pos.y);
}
template <typename T>
auto Grid<T>::width() const -> Index
{
return _width;
}
template <typename T>
auto Grid<T>::height() const -> Index
{
return _height;
}
template <typename T>
T Grid<T>::operator()(Pos pos) const
{
return is_valid(pos) ? _entries[pos.x + _width*pos.y] : default_value;
}
template <typename T>
T Grid<T>::operator()(Index x, Index y) const
{
return is_valid(x, y) ? _entries[x + _width*y] : default_value;
}
template <typename T>
T& Grid<T>::operator()(Pos pos)
{
return is_valid(pos) ? _entries[pos.x + _width*pos.y] : default_value;
}
template <typename T>
T& Grid<T>::operator()(Index x, Index y)
{
return is_valid(x, y) ? _entries[x + _width*y] : default_value;
}
template <typename T>
std::vector<T> const& Grid<T>::getAllEntries() const
{
return _entries;
}
template <typename T>
void Grid<T>::resize(Index width, Index height)
{
_width = width;
_height = height;
_entries.resize(_width*_height);
}
template <typename T>
void Grid<T>::assign(Index width, Index height, T value)
{
_width = width;
_height = height;
_entries.assign(_width*_height, value);
}
template <typename T>
void Grid<T>::setDefaultValue(T value)
{
default_value = value;
}
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