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fix(braces): exempt C++20 templated lambdas from trailing-semicolon check #458

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fix(braces): exempt C++20 templated lambdas from trailing-semicolon check #458

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fix(braces): exempt C++20 templated lambdas from trailing-semicolon c…
breidenbach0 Jul 29, 2026
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[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Jul 31, 2026
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1 change: 1 addition & 0 deletions CHANGELOG.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,7 @@ TBA
===

* Fixed a whitespace/newline false positive for control conditions containing lambdas. (#410)
* Fixed a false positive where C++20 templated lambdas (``[]<T>(...)``) triggered the redundant trailing semicolon warning. (#385)

2.0.2 (2025-04-08)
===========
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1 change: 1 addition & 0 deletions cpplint.py
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Expand Up @@ -5186,6 +5186,7 @@ def CheckTrailingSemicolon(filename, clean_lines, linenum, error):
)
)
or (func and not re.search(r"\boperator\s*\[\s*\]", func.group(1)))
or re.search(r"\]\s*<.*>\s*$", line_prefix)
or re.search(r"\b(?:struct|union)\s+alignas\s*$", line_prefix)
or re.search(r"\bdecltype$", line_prefix)
or re.search(r"\brequires.*$", line_prefix)
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15 changes: 15 additions & 0 deletions cpplint_unittest.py
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Expand Up @@ -3186,6 +3186,21 @@ def testLambda(self):
# Avoid false positives with operator[]
self.TestLint("table_to_children[&*table].push_back(dependent);", "")

# C++20 templated lambdas: []<T>(...) must not trigger the redundant
# trailing semicolon check. Regression test for #385.
self.TestLint("auto x = []<typename T>(T) {};", "")
self.TestLint("auto x = [&]<typename T, int N>(T (&a)[N]) {};", "")
self.TestMultiLineLint(
"auto x = []<typename T>(T t) {\n return t;\n};\n",
"",
)
# A templated *function* (not a lambda) with a redundant trailing
# semicolon must still be flagged.
self.TestLint(
"template <typename T> void f() {};",
"You don't need a ; after a } [readability/braces] [4]",
)

def testBraceInitializerList(self):
self.TestLint("MyStruct p = {1, 2};", "")
self.TestLint("MyStruct p{1, 2};", "")
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