for_each_in_region.hpp

#pragma once
 
#include "terminalpp/core.hpp"
#include "terminalpp/element.hpp"
#include "terminalpp/rectangle.hpp"
 
#include <concepts>  // IWYU pragma: keep
 
namespace terminalpp {
 
template <typename TwoDimensionalContainer>
concept element_container = requires(TwoDimensionalContainer tdc) {
    {
        tdc[terminalpp::coordinate_type{}][terminalpp::coordinate_type{}]
    } -> std::convertible_to<terminalpp::element>;
};
 
//* =========================================================================
//* =========================================================================
void for_each_in_region(
    element_container auto &&container,
    rectangle const &region,
    std::invocable<element &, coordinate_type, coordinate_type> auto &&callable)
{
    for (auto row = region.origin_.y_;
         row < region.origin_.y_ + region.size_.height_;
         ++row)
    {
        for (auto column = region.origin_.x_;
             column < region.origin_.x_ + region.size_.width_;
             ++column)
        {
            callable(container[column][row], column, row);
        }
    }
}
 
}  // namespace terminalpp