Adding Dim3 class

src/pystencilssfg/extensions/gpu.py

+from pystencilssfg import lang
+
+
+def dim3class(gpu_runtime_header: str, *, cls_name: str = "dim3"):
+    """
+    >>> dim3 = dim3class("<hip/hip_runtime.h>")
+    >>> dim3().ctor(64, 1, 1)
+    dim3{64, 1, 1}
+
+    Args:
+        gpu_runtime_header: String with the name of the gpu runtime header
+        cls_name: String with the acutal name (default "dim3")
+    Returns:
+        Dim3Class: A `lang.CppClass` that mimics cuda's/hip's `dim3`
+    """
+    @lang.cppclass(cls_name, gpu_runtime_header)
+    class Dim3Class:
+        def ctor(self, dim0=1, dim1=1, dim2=1):
+            return self.ctor_bind(dim0, dim1, dim2)
+
+        @property
+        def x(self):
+            return lang.AugExpr.format("{}.x", self)
+
+        @property
+        def y(self):
+            return lang.AugExpr.format("{}.y", self)
+
+        @property
+        def z(self):
+            return lang.AugExpr.format("{}.z", self)
+
+        @property
+        def dims(self):
+            """The dims property."""
+            return [self.x, self.y, self.z]
+
+    return Dim3Class

src/pystencilssfg/lang/__init__.py

@@ -12,6 +12,7 @@ from .expressions import (
     depends,
     includes,
     CppClass,
+    cppclass,
     IFieldExtraction,
     SrcField,
     SrcVector,
@@ -36,6 +37,7 @@ __all__ = [
     "SrcVector",
     "cpptype",
     "CppClass",
+    "cppclass",
     "void",
     "Ref",
     "strip_ptr_ref",

src/pystencilssfg/lang/expressions.py

@@ -11,7 +11,7 @@ from pystencils.types import PsType, PsIntegerType, UserTypeSpec, create_type
 
 from ..exceptions import SfgException
 from .headers import HeaderFile
-from .types import strip_ptr_ref, CppType, CppTypeFactory
+from .types import strip_ptr_ref, CppType, CppTypeFactory, cpptype
 
 __all__ = [
     "SfgVar",
@@ -369,6 +369,26 @@ class CppClass(AugExpr):
         return self.bind(fstr, *args, require_headers=dtype.includes)
 
 
+def cppclass(
+    template_str: str, include: str | HeaderFile | Iterable[str | HeaderFile] = ()
+):
+    """
+    Convience class decorator for CppClass.
+    It adds to the decorate class the variable `template` via `lang.cpptype`
+    and sets `lang.CppClass` as a base clase.
+    >>> @cppclass("MyClass", "MyClass.hpp")
+    ... class MyClass:
+    ...    pass
+    """
+
+    def wrapper(cls):
+        new_cls = type(cls.__name__, (cls, CppClass), {})
+        new_cls.template = cpptype(template_str, include)
+        return new_cls
+
+    return wrapper
+
+
 _VarLike = (AugExpr, SfgVar, TypedSymbol)
 VarLike: TypeAlias = AugExpr | SfgVar | TypedSymbol
 """Things that may act as a variable.

tests/extensions/test_gpu.py

+from pystencilssfg.extensions.gpu import dim3class
+from pystencilssfg.lang import HeaderFile, AugExpr
+
+
+def test_dim3():
+    cuda_runtime = "<cuda_runtime.h>"
+    dim3 = dim3class(cuda_runtime, cls_name="dim3")
+    assert HeaderFile.parse(cuda_runtime) in dim3.template.includes
+    assert str(dim3().ctor(128, 1, 1)) == "dim3{128, 1, 1}"
+    assert str(dim3().ctor()) == "dim3{1, 1, 1}"
+    assert str(dim3().ctor(1, 1, 128)) == "dim3{1, 1, 128}"
+
+    block = dim3(ref=True, const=True).var("block")
+
+    dims = [
+        AugExpr.format(
+            "uint32_t(({} + {} - 1)/ {})",
+            1024,
+            block.dims[i],
+            block.dims[i],
+        )
+        for i in range(3)
+    ]
+
+    grid = dim3().ctor(*dims)
+    assert str(grid) == f"dim3{{{', '.join((str(d) for d in dims))}}}"

tests/lang/test_expressions.py

 import pytest
 
 from pystencilssfg import SfgException
-from pystencilssfg.lang import asvar, SfgVar, AugExpr, cpptype, HeaderFile, CppClass
+from pystencilssfg.lang import (
+    asvar,
+    SfgVar,
+    AugExpr,
+    cpptype,
+    HeaderFile,
+    CppClass,
+    cppclass,
+)
 
 import sympy as sp
 
@@ -118,3 +126,17 @@ def test_cppclass():
 
     ctor_expr = unbound.ctor(AugExpr(PsCustomType("bogus")).var("foo"))
     assert str(ctor_expr).strip() == r"mynamespace::MyClass< bogus >{foo}"
+
+
+def test_cppclass_decorator():
+
+    @cppclass("mynamespace::MyClass< {T} >", "MyHeader.hpp")
+    class MyClass(CppClass):
+        def ctor(self, arg: AugExpr):
+            return self.ctor_bind(arg)
+
+    unbound = MyClass(T="bogus")
+    assert unbound.get_dtype() == MyClass.template(T="bogus")
+
+    ctor_expr = unbound.ctor(AugExpr(PsCustomType("bogus")).var("foo"))
+    assert str(ctor_expr).strip() == r"mynamespace::MyClass< bogus >{foo}"