Box2D: the integer index space of a 2D cell-centered Cartesian grid. More...

#include <pops/core/foundation/types.hpp>
#include <algorithm>
#include <cstdint>

Include dependency graph for box2d.hpp:

This graph shows which files directly or indirectly include this file:

Classes
struct	pops::Box2D
	2D integer index space, cell-centered. More...

Namespaces
namespace	pops

Functions
POPS_HD constexpr int	pops::floor_div (int a, int b)
	Integer division of a by b rounded down (handles a < 0 AND b < 0). POPS_HD constexpr (kernels).

Detailed Description

Box2D: the integer index space of a 2D cell-centered Cartesian grid.

Building block of the AMR stack, inspired by AMReX's Box. Corners lo / hi INCLUSIVE (AMReX convention); box EMPTY if hi < lo along a direction. Pure integer arithmetic: no data, no parallelism, fully testable. Indices may be NEGATIVE (ghost layers), hence the FLOOR division in coarsen (consistent on both sides of zero). length/nx/ny are POPS_HD (called from Geometry::dx()/dy() inside a device kernel). Concrete 2D to match the physical targets: 2D is an official, introspectable invariant of the core (pops.capabilities()["dimension"] == 2, ADR-0001 Decision 1; see docs/sphinx/reference/known-limitations.md), not an oversight. The move to a Dim-template (BoxND) is a generalization deferred to a future milestone (Option B).

include/pops/mesh/index/box2d.hpp File Reference¶

Classes

Namespaces

Functions

Detailed Description