cpplint · yangfan-yf-yf · Jul 25, 2026 · Jul 25, 2026 · Jul 25, 2026 · Jul 25, 2026
diff --git a/CHANGELOG.rst b/CHANGELOG.rst
@@ -8,6 +8,7 @@ TBA
 * Fixed a whitespace/newline false positive for control conditions containing lambdas. (#410)
 * We now error on relative include paths (``./``, ``../``). (#432)
    * This makes ``#include "./foo.h"`` produce two separate errors: that foo.cpp should include foo.h and that relative paths are not allowed.
+* Deleted single-argument constructors no longer trigger ``runtime/explicit``. (#386)
 
 2.0.2 (2025-04-08)
 ===========

diff --git a/cpplint.py b/cpplint.py
@@ -3786,6 +3786,43 @@ def InnermostClass(self):
         return None
 
 
+def _GetConstructorSuffix(clean_lines, linenum, match_end):
+    """Returns the constructor declaration suffix up to its top-level terminator."""
+    constructor_suffix = []
+    paren_depth = 0
+    bracket_depth = 0
+    brace_depth = 0
+    suffix_line = clean_lines.elided[linenum][match_end:]
+    next_line = linenum + 1
+
+    while True:
+        for char in suffix_line:
+            if char == ";" and not paren_depth and not bracket_depth and not brace_depth:
+                constructor_suffix.append(char)
+                return "".join(constructor_suffix)
+            if char == "{" and not paren_depth and not bracket_depth and not brace_depth:
+                return "".join(constructor_suffix)
+
+            constructor_suffix.append(char)
+            if char == "(":
+                paren_depth += 1
+            elif char == ")":
+                paren_depth -= 1
+            elif char == "[":
+                bracket_depth += 1
+            elif char == "]":
+                bracket_depth -= 1
+            elif char == "{":
+                brace_depth += 1
+            elif char == "}":
+                brace_depth -= 1
+
+        if next_line >= clean_lines.NumLines():
+            return "".join(constructor_suffix)
+        suffix_line = "\n" + clean_lines.elided[next_line]
+        next_line += 1
+
+
 def CheckForNonStandardConstructs(filename, clean_lines, linenum, nesting_state, error):
     r"""Logs an error if we see certain non-ANSI constructs ignored by gcc-2.
 
@@ -3932,6 +3969,16 @@ def CheckForNonStandardConstructs(filename, clean_lines, linenum, nesting_state,
 
     if explicit_constructor_match:
         is_marked_explicit = explicit_constructor_match.group(1)
+        constructor_suffix = _GetConstructorSuffix(
+            clean_lines, linenum, explicit_constructor_match.end()
+        )
+        is_deleted = bool(
+            re.search(
+                r"=\s*delete\s*(?:\(.*\))?\s*;\s*$",
+                constructor_suffix,
+                re.DOTALL,
+            )
+        )
 
         if not explicit_constructor_match.group(2):
             constructor_args = []
@@ -3990,6 +4037,7 @@ def CheckForNonStandardConstructs(filename, clean_lines, linenum, nesting_state,
 
         if (
             not is_marked_explicit
+            and not is_deleted
             and onearg_constructor
             and not initializer_list_constructor
             and not copy_constructor

diff --git a/cpplint_unittest.py b/cpplint_unittest.py
@@ -1639,6 +1639,68 @@ class Foo {
           };""",
                 "Single-parameter constructors should be marked explicit.  [runtime/explicit] [4]",
             )
+            # Deleted constructors cannot be called implicitly.
+            self.TestMultiLineLint(
+                """
+          class Foo {
+            Foo(int f) = delete;
+          };""",
+                "",
+            )
+            # Deleted constructors may include a noexcept suffix or split the
+            # deleted marker across lines.
+            self.TestMultiLineLint(
+                """
+          class Foo {
+            Foo(int f) noexcept = delete;
+          };""",
+                "",
+            )
+            self.TestMultiLineLint(
+                """
+          class Foo {
+            Foo(int f) noexcept(noexcept(T{})) = delete;
+          };""",
+                "",
+            )
+            self.TestMultiLineLint(
+                """
+          class Foo {
+            template <class T>
+            Foo(T value) requires Integral<T> = delete;
+          };""",
+                "",
+            )
+            self.TestMultiLineLint(
+                """
+          class Foo {
+            template <class T>
+            Foo(T value) requires Integral<T>;
+          };""",
+                "Single-parameter constructors should be marked explicit.  [runtime/explicit] [4]",
+            )
+            self.TestMultiLineLint(
+                """
+          class Foo {
+            Foo(int f) throw() = delete;
+          };""",
+                "",
+            )
+            self.TestMultiLineLint(
+                """
+          class Foo {
+            Foo(int f) = delete("use Bar instead");
+          };""",
+                "",
+            )
+            self.TestMultiLineLint(
+                """
+          class Foo {
+            Foo(int f)
+                = delete;
+          };""",
+                "",
+            )
             # missing explicit is bad, even with whitespace
             self.TestMultiLineLint(
                 """