[cppyy] Consider Python int and float for make_unique optimization

The `std::make_unique` function is Pythonized to avoid unnecessary code
generation by TClingCallFunc, which might also go wrong (as reported in
GitHub issue #19122).

There is a fallback to calling the original `make_unique` for builtin
types (introduced in [1]), but we don't need that if we know the builtin
type can be readily used in the `unique_ptr` constructor, as is the case
for `int` and `float`.

Hence, this commit suggests to not use the fallback for `int` and
`float`, which also closes #19122 because no wrapper code has to be
generated anymore.

[1] wlav/cppyy@62a97c9

Author: guitargeek

bindings/pyroot/cppyy/cppyy/python/cppyy/__init__.py

@@ -153,6 +153,13 @@ def __init__(self, ptrcls, maker):
     def __call__(self, ptr):
         return py_make_smartptr(type(ptr), self.ptrcls)(ptr)
     def __getitem__(self, cls):
+        # For the builtin types that directly map to C++ types, we get the name
+        # immediately so we don't reach the fallback in the end.
+        # See also Utility::ConstructTemplateArgs() in CPyCpyy.
+        if cls is int:
+            cls = "int"
+        elif cls is float:
+            cls = "float"
         try:
             if not cls.__module__ == int.__module__:
                 return py_make_smartptr(cls, self.ptrcls)

bindings/pyroot/cppyy/cppyy/test/test_cpp11features.py

@@ -438,7 +438,6 @@ def test14_shared_ptr_passing(self):
             gc.collect()
             assert TestSmartPtr.s_counter == 0
 
-    @mark.xfail(strict=True, condition=IS_WINDOWS | IS_MAC_ARM, reason='ValueError: Could not find "make_unique<int>"')
     def test15_unique_ptr_template_deduction(self):
         """Argument type deduction with std::unique_ptr"""
 
@@ -458,7 +457,6 @@ def test15_unique_ptr_template_deduction(self):
         with raises(ValueError):  # not an RValue
             cppyy.gbl.UniqueTempl.returnptr[int](uptr_in)
 
-    @mark.xfail(strict=True, condition=IS_WINDOWS | IS_MAC_ARM, reason='TypeError: Could not find "make_unique<int>"')
     def test16_unique_ptr_moves(self):
         """std::unique_ptr requires moves"""