[libcxx-commits] [libcxx] [libc++] Adds is_implemented function for new ftm generator. (PR #134538)
Mark de Wever via libcxx-commits
libcxx-commits at lists.llvm.org
Tue Apr 8 10:40:06 PDT 2025
https://github.com/mordante updated https://github.com/llvm/llvm-project/pull/134538
>From 3736fdd4d9e4772daa4f78656b81d239d0735044 Mon Sep 17 00:00:00 2001
From: Mark de Wever <koraq at xs4all.nl>
Date: Sat, 5 Apr 2025 12:15:08 +0200
Subject: [PATCH 1/3] [NFC][libc++][test] Refactor new ftm generator tests.
This uses the python unit test framework instead of just asserts.
This improves the diagnostics when a test fails.
---
.../feature_test_macro/ftm_metadata.sh.py | 73 ++++++++------
.../feature_test_macro/implemented_ftms.sh.py | 98 +++++++++---------
.../feature_test_macro/standard_ftms.sh.py | 99 ++++++++++---------
.../feature_test_macro/std_dialects.sh.py | 35 ++++---
.../feature_test_macro/version_header.sh.py | 28 ++++--
.../version_header_implementation.sh.py | 36 +++----
6 files changed, 208 insertions(+), 161 deletions(-)
diff --git a/libcxx/test/libcxx/feature_test_macro/ftm_metadata.sh.py b/libcxx/test/libcxx/feature_test_macro/ftm_metadata.sh.py
index 4f23773f9a0a5..52696d8bc3605 100644
--- a/libcxx/test/libcxx/feature_test_macro/ftm_metadata.sh.py
+++ b/libcxx/test/libcxx/feature_test_macro/ftm_metadata.sh.py
@@ -9,39 +9,48 @@
# RUN: %{python} %s %{libcxx-dir}/utils %{libcxx-dir}/test/libcxx/feature_test_macro/test_data.json
import sys
+import unittest
-sys.path.append(sys.argv[1])
+UTILS = sys.argv[1]
+TEST_DATA = sys.argv[2]
+del sys.argv[1:3]
+
+sys.path.append(UTILS)
from generate_feature_test_macro_components import FeatureTestMacros, Metadata
-def test(output, expected):
- assert output == expected, f"expected\n{expected}\n\noutput\n{output}"
-
-
-ftm = FeatureTestMacros(sys.argv[2])
-
-test(
- ftm.ftm_metadata,
- {
- "__cpp_lib_any": Metadata(
- headers=["any"], test_suite_guard=None, libcxx_guard=None
- ),
- "__cpp_lib_barrier": Metadata(
- headers=["barrier"],
- test_suite_guard="!defined(_LIBCPP_VERSION) || (_LIBCPP_HAS_THREADS && _LIBCPP_AVAILABILITY_HAS_SYNC)",
- libcxx_guard="_LIBCPP_HAS_THREADS && _LIBCPP_AVAILABILITY_HAS_SYNC",
- ),
- "__cpp_lib_format": Metadata(
- headers=["format"], test_suite_guard=None, libcxx_guard=None
- ),
- "__cpp_lib_parallel_algorithm": Metadata(
- headers=["algorithm", "numeric"], test_suite_guard=None, libcxx_guard=None
- ),
- "__cpp_lib_variant": Metadata(
- headers=["variant"], test_suite_guard=None, libcxx_guard=None
- ),
- "__cpp_lib_missing_FTM_in_older_standard": Metadata(
- headers=[], test_suite_guard=None, libcxx_guard=None
- ),
- },
-)
+class Test(unittest.TestCase):
+ def setUp(self):
+ self.ftm = FeatureTestMacros(TEST_DATA)
+ self.maxDiff = None # This causes the diff to be printed when the test fails
+
+ def test_implementation(self):
+ expected = {
+ "__cpp_lib_any": Metadata(
+ headers=["any"], test_suite_guard=None, libcxx_guard=None
+ ),
+ "__cpp_lib_barrier": Metadata(
+ headers=["barrier"],
+ test_suite_guard="!defined(_LIBCPP_VERSION) || (_LIBCPP_HAS_THREADS && _LIBCPP_AVAILABILITY_HAS_SYNC)",
+ libcxx_guard="_LIBCPP_HAS_THREADS && _LIBCPP_AVAILABILITY_HAS_SYNC",
+ ),
+ "__cpp_lib_format": Metadata(
+ headers=["format"], test_suite_guard=None, libcxx_guard=None
+ ),
+ "__cpp_lib_parallel_algorithm": Metadata(
+ headers=["algorithm", "numeric"],
+ test_suite_guard=None,
+ libcxx_guard=None,
+ ),
+ "__cpp_lib_variant": Metadata(
+ headers=["variant"], test_suite_guard=None, libcxx_guard=None
+ ),
+ "__cpp_lib_missing_FTM_in_older_standard": Metadata(
+ headers=[], test_suite_guard=None, libcxx_guard=None
+ ),
+ }
+ self.assertEqual(self.ftm.ftm_metadata, expected)
+
+
+if __name__ == "__main__":
+ unittest.main()
diff --git a/libcxx/test/libcxx/feature_test_macro/implemented_ftms.sh.py b/libcxx/test/libcxx/feature_test_macro/implemented_ftms.sh.py
index 942cd4b608760..92e14757ddd49 100644
--- a/libcxx/test/libcxx/feature_test_macro/implemented_ftms.sh.py
+++ b/libcxx/test/libcxx/feature_test_macro/implemented_ftms.sh.py
@@ -9,51 +9,61 @@
# RUN: %{python} %s %{libcxx-dir}/utils %{libcxx-dir}/test/libcxx/feature_test_macro/test_data.json
import sys
+import unittest
-sys.path.append(sys.argv[1])
+UTILS = sys.argv[1]
+TEST_DATA = sys.argv[2]
+del sys.argv[1:3]
+
+sys.path.append(UTILS)
from generate_feature_test_macro_components import FeatureTestMacros
-def test(output, expected):
- assert output == expected, f"expected\n{expected}\n\noutput\n{output}"
-
-
-ftm = FeatureTestMacros(sys.argv[2])
-test(
- ftm.implemented_ftms,
- {
- "__cpp_lib_any": {
- "c++17": "201606L",
- "c++20": "201606L",
- "c++23": "201606L",
- "c++26": "201606L",
- },
- "__cpp_lib_barrier": {
- "c++20": "201907L",
- "c++23": "201907L",
- "c++26": "299900L",
- },
- "__cpp_lib_format": {
- "c++20": None,
- "c++23": None,
- "c++26": None,
- },
- "__cpp_lib_parallel_algorithm": {
- "c++17": "201603L",
- "c++20": "201603L",
- "c++23": "201603L",
- "c++26": "201603L",
- },
- "__cpp_lib_variant": {
- "c++17": "202102L",
- "c++20": "202102L",
- "c++23": "202102L",
- "c++26": "202102L",
- },
- "__cpp_lib_missing_FTM_in_older_standard": {
- "c++17": None,
- "c++20": None,
- "c++26": None,
- },
- },
-)
+class Test(unittest.TestCase):
+ def setUp(self):
+ self.ftm = FeatureTestMacros(TEST_DATA)
+ self.maxDiff = None # This causes the diff to be printed when the test fails
+
+ def test_implementation(self):
+
+ expected = {
+ "__cpp_lib_any": {
+ "c++17": "201606L",
+ "c++20": "201606L",
+ "c++23": "201606L",
+ "c++26": "201606L",
+ },
+ "__cpp_lib_barrier": {
+ "c++20": "201907L",
+ "c++23": "201907L",
+ "c++26": "299900L",
+ },
+ "__cpp_lib_format": {
+ "c++20": None,
+ "c++23": None,
+ "c++26": None,
+ },
+ "__cpp_lib_parallel_algorithm": {
+ "c++17": "201603L",
+ "c++20": "201603L",
+ "c++23": "201603L",
+ "c++26": "201603L",
+ },
+ "__cpp_lib_variant": {
+ "c++17": "202102L",
+ "c++20": "202102L",
+ "c++23": "202102L",
+ "c++26": "202102L",
+ },
+ "__cpp_lib_missing_FTM_in_older_standard": {
+ "c++17": None,
+ "c++20": None,
+ "c++26": None,
+ },
+ }
+
+ self.assertEqual(self.ftm.implemented_ftms, expected)
+
+
+if __name__ == "__main__":
+ unittest.main()
diff --git a/libcxx/test/libcxx/feature_test_macro/standard_ftms.sh.py b/libcxx/test/libcxx/feature_test_macro/standard_ftms.sh.py
index 95c9b9baaf2fa..ac3e284261d03 100644
--- a/libcxx/test/libcxx/feature_test_macro/standard_ftms.sh.py
+++ b/libcxx/test/libcxx/feature_test_macro/standard_ftms.sh.py
@@ -9,52 +9,61 @@
# RUN: %{python} %s %{libcxx-dir}/utils %{libcxx-dir}/test/libcxx/feature_test_macro/test_data.json
import sys
+import unittest
-sys.path.append(sys.argv[1])
+UTILS = sys.argv[1]
+TEST_DATA = sys.argv[2]
+del sys.argv[1:3]
+
+sys.path.append(UTILS)
from generate_feature_test_macro_components import FeatureTestMacros
-def test(output, expected):
- assert output == expected, f"expected\n{expected}\n\noutput\n{output}"
-
-
-ftm = FeatureTestMacros(sys.argv[2])
-test(
- ftm.standard_ftms,
- {
- "__cpp_lib_any": {
- "c++17": "201606L",
- "c++20": "201606L",
- "c++23": "201606L",
- "c++26": "201606L",
- },
- "__cpp_lib_barrier": {
- "c++20": "201907L",
- "c++23": "201907L",
- "c++26": "299900L",
- },
- "__cpp_lib_format": {
- "c++20": "202110L",
- "c++23": "202207L",
- "c++26": "202311L",
- },
- "__cpp_lib_parallel_algorithm": {
- "c++17": "201603L",
- "c++20": "201603L",
- "c++23": "201603L",
- "c++26": "201603L",
- },
- "__cpp_lib_variant": {
- "c++17": "202102L",
- "c++20": "202106L",
- "c++23": "202106L",
- "c++26": "202306L",
- },
- "__cpp_lib_missing_FTM_in_older_standard": {
- "c++17": "2017L",
- "c++20": "2020L",
- "c++23": "2020L",
- "c++26": "2026L",
- },
- },
-)
+class Test(unittest.TestCase):
+ def setUp(self):
+ self.ftm = FeatureTestMacros(TEST_DATA)
+ self.maxDiff = None # This causes the diff to be printed when the test fails
+
+ def test_implementation(self):
+ expected = {
+ "__cpp_lib_any": {
+ "c++17": "201606L",
+ "c++20": "201606L",
+ "c++23": "201606L",
+ "c++26": "201606L",
+ },
+ "__cpp_lib_barrier": {
+ "c++20": "201907L",
+ "c++23": "201907L",
+ "c++26": "299900L",
+ },
+ "__cpp_lib_format": {
+ "c++20": "202110L",
+ "c++23": "202207L",
+ "c++26": "202311L",
+ },
+ "__cpp_lib_parallel_algorithm": {
+ "c++17": "201603L",
+ "c++20": "201603L",
+ "c++23": "201603L",
+ "c++26": "201603L",
+ },
+ "__cpp_lib_variant": {
+ "c++17": "202102L",
+ "c++20": "202106L",
+ "c++23": "202106L",
+ "c++26": "202306L",
+ },
+ "__cpp_lib_missing_FTM_in_older_standard": {
+ "c++17": "2017L",
+ "c++20": "2020L",
+ "c++23": "2020L",
+ "c++26": "2026L",
+ },
+ }
+
+ self.assertEqual(self.ftm.standard_ftms, expected)
+
+
+if __name__ == "__main__":
+ unittest.main()
diff --git a/libcxx/test/libcxx/feature_test_macro/std_dialects.sh.py b/libcxx/test/libcxx/feature_test_macro/std_dialects.sh.py
index 368020c91e1d2..e3cca860f9ce6 100644
--- a/libcxx/test/libcxx/feature_test_macro/std_dialects.sh.py
+++ b/libcxx/test/libcxx/feature_test_macro/std_dialects.sh.py
@@ -9,22 +9,31 @@
# RUN: %{python} %s %{libcxx-dir}/utils %{libcxx-dir}/test/libcxx/feature_test_macro/test_data.json
import sys
+import unittest
-sys.path.append(sys.argv[1])
+UTILS = sys.argv[1]
+TEST_DATA = sys.argv[2]
+del sys.argv[1:3]
+
+sys.path.append(UTILS)
from generate_feature_test_macro_components import FeatureTestMacros
-def test(output, expected):
- assert output == expected, f"expected\n{expected}\n\noutput\n{output}"
+class Test(unittest.TestCase):
+ def setUp(self):
+ self.ftm = FeatureTestMacros(TEST_DATA)
+ self.maxDiff = None # This causes the diff to be printed when the test fails
+
+ def test_implementation(self):
+ expected = [
+ "c++17",
+ "c++20",
+ "c++23",
+ "c++26",
+ ]
+
+ self.assertEqual(self.ftm.std_dialects, expected)
-ftm = FeatureTestMacros(sys.argv[2])
-test(
- ftm.std_dialects,
- [
- "c++17",
- "c++20",
- "c++23",
- "c++26",
- ],
-)
+if __name__ == "__main__":
+ unittest.main()
diff --git a/libcxx/test/libcxx/feature_test_macro/version_header.sh.py b/libcxx/test/libcxx/feature_test_macro/version_header.sh.py
index 1e53d5fd92830..e3053c18a5211 100644
--- a/libcxx/test/libcxx/feature_test_macro/version_header.sh.py
+++ b/libcxx/test/libcxx/feature_test_macro/version_header.sh.py
@@ -9,19 +9,23 @@
# RUN: %{python} %s %{libcxx-dir}/utils %{libcxx-dir}/test/libcxx/feature_test_macro/test_data.json
import sys
+import unittest
-sys.path.append(sys.argv[1])
-from generate_feature_test_macro_components import FeatureTestMacros
+UTILS = sys.argv[1]
+TEST_DATA = sys.argv[2]
+del sys.argv[1:3]
+sys.path.append(UTILS)
+from generate_feature_test_macro_components import FeatureTestMacros
-def test(output, expected):
- assert output == expected, f"expected\n{expected}\n\noutput\n{output}"
+class Test(unittest.TestCase):
+ def setUp(self):
+ self.ftm = FeatureTestMacros(TEST_DATA)
+ self.maxDiff = None # This causes the diff to be printed when the test fails
-ftm = FeatureTestMacros(sys.argv[2])
-test(
- ftm.version_header,
- """// -*- C++ -*-
+ def test_implementeation(self):
+ expected = """// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
@@ -70,5 +74,9 @@ def test(output, expected):
#endif // _LIBCPP_STD_VER >= 26
#endif // _LIBCPP_VERSIONH
-""",
-)
+"""
+ self.assertEqual(self.ftm.version_header, expected)
+
+
+if __name__ == "__main__":
+ unittest.main()
diff --git a/libcxx/test/libcxx/feature_test_macro/version_header_implementation.sh.py b/libcxx/test/libcxx/feature_test_macro/version_header_implementation.sh.py
index 2771a2f7d8abf..2ab6a9be7339b 100644
--- a/libcxx/test/libcxx/feature_test_macro/version_header_implementation.sh.py
+++ b/libcxx/test/libcxx/feature_test_macro/version_header_implementation.sh.py
@@ -18,10 +18,11 @@
sys.path.append(UTILS)
from generate_feature_test_macro_components import FeatureTestMacros, VersionHeader
+
class Test(unittest.TestCase):
def setUp(self):
self.ftm = FeatureTestMacros(TEST_DATA)
- self.maxDiff = None # This causes the diff to be printed when the test fails
+ self.maxDiff = None # This causes the diff to be printed when the test fails
def test_implementation(self):
expected = {
@@ -51,11 +52,11 @@ def test_implementation(self):
),
},
{
- "__cpp_lib_missing_FTM_in_older_standard" : VersionHeader(
- value = "2017L",
- implemented = False,
- need_undef = False,
- condition = None,
+ "__cpp_lib_missing_FTM_in_older_standard": VersionHeader(
+ value="2017L",
+ implemented=False,
+ need_undef=False,
+ condition=None,
),
},
],
@@ -85,11 +86,11 @@ def test_implementation(self):
),
},
{
- "__cpp_lib_missing_FTM_in_older_standard" : VersionHeader(
- value = "2020L",
- implemented = False,
- need_undef = False,
- condition = None,
+ "__cpp_lib_missing_FTM_in_older_standard": VersionHeader(
+ value="2020L",
+ implemented=False,
+ need_undef=False,
+ condition=None,
),
},
],
@@ -129,11 +130,11 @@ def test_implementation(self):
),
},
{
- "__cpp_lib_missing_FTM_in_older_standard" : VersionHeader(
- value = "2026L",
- implemented = False,
- need_undef = False,
- condition = None,
+ "__cpp_lib_missing_FTM_in_older_standard": VersionHeader(
+ value="2026L",
+ implemented=False,
+ need_undef=False,
+ condition=None,
),
},
],
@@ -141,5 +142,6 @@ def test_implementation(self):
self.assertEqual(self.ftm.version_header_implementation, expected)
-if __name__ == '__main__':
+
+if __name__ == "__main__":
unittest.main()
>From 72954e170f2c91c10d4dd4702db981a7b8c756fc Mon Sep 17 00:00:00 2001
From: Mark de Wever <koraq at xs4all.nl>
Date: Sat, 5 Apr 2025 12:15:09 +0200
Subject: [PATCH 2/3] [libc++] Adds is_implemented function for new ftm
generator.
At the moment the ftm macro for __cpp_lib_to_chars will have the
following values:
standard_ftms: {
"c++17": "201611L",
"c++20": "201611L",
"c++23": "201611L",
"c++26": "201611L",
}
implemented_ftms: {
"c++17": None,
}
This is an issue with the test whether the FTM is implemented it does:
self.implemented_ftms[ftm][std] == self.standard_ftms[ftm][std]
This will fail in C++20 since implemented_ftms[ftm] does not have the
key c++20. This adds a new helper function and removes the None entries
when a FTM is not implemented.
---
.../feature_test_macro/implemented_ftms.sh.py | 12 +-----
.../feature_test_macro/is_implemented.sh.py | 39 +++++++++++++++++++
.../generate_feature_test_macro_components.py | 19 ++++++++-
3 files changed, 58 insertions(+), 12 deletions(-)
create mode 100644 libcxx/test/libcxx/feature_test_macro/is_implemented.sh.py
diff --git a/libcxx/test/libcxx/feature_test_macro/implemented_ftms.sh.py b/libcxx/test/libcxx/feature_test_macro/implemented_ftms.sh.py
index 92e14757ddd49..4f445d55c883c 100644
--- a/libcxx/test/libcxx/feature_test_macro/implemented_ftms.sh.py
+++ b/libcxx/test/libcxx/feature_test_macro/implemented_ftms.sh.py
@@ -38,11 +38,7 @@ def test_implementation(self):
"c++23": "201907L",
"c++26": "299900L",
},
- "__cpp_lib_format": {
- "c++20": None,
- "c++23": None,
- "c++26": None,
- },
+ "__cpp_lib_format": {},
"__cpp_lib_parallel_algorithm": {
"c++17": "201603L",
"c++20": "201603L",
@@ -55,11 +51,7 @@ def test_implementation(self):
"c++23": "202102L",
"c++26": "202102L",
},
- "__cpp_lib_missing_FTM_in_older_standard": {
- "c++17": None,
- "c++20": None,
- "c++26": None,
- },
+ "__cpp_lib_missing_FTM_in_older_standard": {},
}
self.assertEqual(self.ftm.implemented_ftms, expected)
diff --git a/libcxx/test/libcxx/feature_test_macro/is_implemented.sh.py b/libcxx/test/libcxx/feature_test_macro/is_implemented.sh.py
new file mode 100644
index 0000000000000..0414722b89a76
--- /dev/null
+++ b/libcxx/test/libcxx/feature_test_macro/is_implemented.sh.py
@@ -0,0 +1,39 @@
+# ===----------------------------------------------------------------------===##
+#
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+#
+# ===----------------------------------------------------------------------===##
+
+# RUN: %{python} %s %{libcxx-dir}/utils %{libcxx-dir}/test/libcxx/feature_test_macro/test_data.json
+
+import sys
+import unittest
+
+UTILS = sys.argv[1]
+TEST_DATA = sys.argv[2]
+del sys.argv[1:3]
+
+sys.path.append(UTILS)
+from generate_feature_test_macro_components import FeatureTestMacros, Metadata
+
+
+class Test(unittest.TestCase):
+ def setUp(self):
+ self.ftm = FeatureTestMacros(TEST_DATA)
+ self.maxDiff = None # This causes the diff to be printed when the test fails
+
+ def test_implementation(self):
+ # FTM not available in C++14.
+ self.assertEqual(self.ftm.is_implemented("__cpp_lib_any", "c++14"), False)
+ self.assertEqual(self.ftm.is_implemented("__cpp_lib_any", "c++17"), True)
+
+ self.assertEqual(self.ftm.is_implemented("__cpp_lib_format", "c++20"), False)
+
+ # FTM C++20 202106L, libc++ has 202102L
+ self.assertEqual(self.ftm.is_implemented("__cpp_lib_variant", "c++20"), False)
+
+
+if __name__ == "__main__":
+ unittest.main()
diff --git a/libcxx/utils/generate_feature_test_macro_components.py b/libcxx/utils/generate_feature_test_macro_components.py
index 53252d5e2d673..ecf31f5af7fb2 100755
--- a/libcxx/utils/generate_feature_test_macro_components.py
+++ b/libcxx/utils/generate_feature_test_macro_components.py
@@ -2012,7 +2012,8 @@ def get_ftms(
else:
break
- entry[std] = last
+ if last:
+ entry[std] = last
result[feature["name"]] = entry
return result
@@ -2208,6 +2209,20 @@ def implemented_ftms(self) -> Dict[Ftm, Dict[Std, Optional[Value]]]:
return get_ftms(self.__data, self.std_dialects, True)
+ def is_implemented(self, ftm: Ftm, std: Std) -> bool:
+ """Has the FTM `ftm` been implemented in the dialect `std`?"""
+
+ # When a paper for C++20 has not been implemented in libc++, then there will be no
+ # FTM entry in implemented_ftms for C++23 and later.
+ #
+ # Typically standard_ftms is not used with invalid values in the code, but
+ # guard just in case.
+ if not std in self.implemented_ftms[ftm].keys() or not std in self.standard_ftms[ftm].keys():
+ return False
+
+ return self.implemented_ftms[ftm][std] == self.standard_ftms[ftm][std]
+
+
@functools.cached_property
def ftm_metadata(self) -> Dict[Ftm, Metadata]:
"""Returns the metadata of the FTMs defined in the Standard.
@@ -2241,7 +2256,7 @@ def version_header_implementation(self) -> Dict[Std, Dict[Ftm, VersionHeader]]:
continue
last_value = value
- implemented = self.implemented_ftms[ftm][std] == self.standard_ftms[ftm][std]
+ implemented = self.is_implemented(ftm, std)
entry = VersionHeader(
value,
implemented,
>From 14c5af3d814e39b9a811f19595430ebcb61f8328 Mon Sep 17 00:00:00 2001
From: Mark de Wever <koraq at xs4all.nl>
Date: Tue, 8 Apr 2025 19:39:57 +0200
Subject: [PATCH 3/3] Update
libcxx/utils/generate_feature_test_macro_components.py
Co-authored-by: Louis Dionne <ldionne.2 at gmail.com>
---
libcxx/utils/generate_feature_test_macro_components.py | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/libcxx/utils/generate_feature_test_macro_components.py b/libcxx/utils/generate_feature_test_macro_components.py
index ecf31f5af7fb2..4c09f4750aefb 100755
--- a/libcxx/utils/generate_feature_test_macro_components.py
+++ b/libcxx/utils/generate_feature_test_macro_components.py
@@ -2213,10 +2213,8 @@ def is_implemented(self, ftm: Ftm, std: Std) -> bool:
"""Has the FTM `ftm` been implemented in the dialect `std`?"""
# When a paper for C++20 has not been implemented in libc++, then there will be no
- # FTM entry in implemented_ftms for C++23 and later.
- #
- # Typically standard_ftms is not used with invalid values in the code, but
- # guard just in case.
+ # FTM entry in implemented_ftms for C++23 and later. Similarly, a paper like <format>
+ # has no entry in standard_ftms for e.g. C++11.
if not std in self.implemented_ftms[ftm].keys() or not std in self.standard_ftms[ftm].keys():
return False
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