[clang-tidy] misc-non-private-member-variables-in-classes: ignore implicit methods

Otherwise we don't warn on a struct containing a single public int, but
we warn on a struct containing a single public std::string, which is
inconsistent.

llvm-svn: 351686

clang-tools-extra/clang-tidy/misc/NonPrivateMemberVariablesInClassesCheck.cpp

@@ -22,8 +22,8 @@ AST_MATCHER(CXXRecordDecl, hasMethods) {
   return std::distance(Node.method_begin(), Node.method_end()) != 0;
 }
 
-AST_MATCHER(CXXRecordDecl, hasNonStaticMethod) {
-  return hasMethod(unless(isStaticStorageClass()))
+AST_MATCHER(CXXRecordDecl, hasNonStaticNonImplicitMethod) {
+  return hasMethod(unless(anyOf(isStaticStorageClass(), isImplicit())))
       .matches(Node, Finder, Builder);
 }
 
@@ -66,10 +66,11 @@ void NonPrivateMemberVariablesInClassesCheck::registerMatchers(
       IgnorePublicMemberVariables ? isProtected() : unless(isPrivate()));
 
   // We only want the records that not only contain the mutable data (non-static
-  // member variables), but also have some logic (non-static member functions).
-  // We may optionally ignore records where all the member variables are public.
+  // member variables), but also have some logic (non-static, non-implicit
+  // member functions).  We may optionally ignore records where all the member
+  // variables are public.
   Finder->addMatcher(cxxRecordDecl(anyOf(isStruct(), isClass()), hasMethods(),
-                                   hasNonStaticMethod(),
+                                   hasNonStaticNonImplicitMethod(),
                                    unless(ShouldIgnoreRecord),
                                    forEach(InterestingField.bind("field")))
                          .bind("record"),

clang-tools-extra/docs/clang-tidy/checks/misc-non-private-member-variables-in-classes.rst

@@ -6,11 +6,11 @@ misc-non-private-member-variables-in-classes
 `cppcoreguidelines-non-private-member-variables-in-classes` redirects here
 as an alias for this check.
 
-Finds classes that contain non-static data members in addition to non-static
-member functions and diagnose all data members declared with a non-``public``
-access specifier. The data members should be declared as ``private`` and
-accessed through member functions instead of exposed to derived classes or
-class consumers.
+Finds classes that contain non-static data members in addition to user-declared
+non-static member functions and diagnose all data members declared with a
+non-``public`` access specifier. The data members should be declared as
+``private`` and accessed through member functions instead of exposed to derived
+classes or class consumers.
 
 Options
 -------

clang-tools-extra/test/clang-tidy/misc-non-private-member-variables-in-classes.cpp

@@ -35,6 +35,23 @@ private:
   int S1_v3;
 };
 
+// Only data and implicit or static methods, do not warn
+
+class C {
+public:
+  C() {}
+  ~C() {}
+};
+
+struct S1Implicit {
+  C S1Implicit_v0;
+};
+
+struct S1ImplicitAndStatic {
+  C S1Implicit_v0;
+  static void s() {}
+};
+
 //----------------------------------------------------------------------------//
 
 // All functions are static, do not warn.