[clang-tidy][NFC] replace comparison of begin and end iterators with range empty (#91994)

Improves readability by changing comparisons of `*_begin` and `*_end`
iterators into `.empty()` on their range.

Author: 5chmidti

clang-tools-extra/clang-tidy/bugprone/SuspiciousEnumUsageCheck.cpp

@@ -171,8 +171,7 @@ void SuspiciousEnumUsageCheck::check(const MatchFinder::MatchResult &Result) {
     // Skip when one of the parameters is an empty enum. The
     // hasDisjointValueRange function could not decide the values properly in
     // case of an empty enum.
-    if (EnumDec->enumerator_begin() == EnumDec->enumerator_end() ||
-        OtherEnumDec->enumerator_begin() == OtherEnumDec->enumerator_end())
+    if (EnumDec->enumerators().empty() || OtherEnumDec->enumerators().empty())
       return;
 
     if (!hasDisjointValueRange(EnumDec, OtherEnumDec))

clang-tools-extra/clang-tidy/cppcoreguidelines/MisleadingCaptureDefaultByValueCheck.cpp

@@ -67,8 +67,7 @@ static std::string createReplacementText(const LambdaExpr *Lambda) {
       AppendName("this");
     }
   }
-  if (!Replacement.empty() &&
-      Lambda->explicit_capture_begin() != Lambda->explicit_capture_end()) {
+  if (!Replacement.empty() && !Lambda->explicit_captures().empty()) {
     // Add back separator if we are adding explicit capture variables.
     Stream << ", ";
   }

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

@@ -192,9 +192,7 @@ void UnusedParametersCheck::check(const MatchFinder::MatchResult &Result) {
 
     // In non-strict mode ignore function definitions with empty bodies
     // (constructor initializer counts for non-empty body).
-    if (StrictMode ||
-        (Function->getBody()->child_begin() !=
-         Function->getBody()->child_end()) ||
+    if (StrictMode || !Function->getBody()->children().empty() ||
         (isa<CXXConstructorDecl>(Function) &&
          cast<CXXConstructorDecl>(Function)->getNumCtorInitializers() > 0))
       warnOnUnusedParameter(Result, Function, I);

clang-tools-extra/clang-tidy/modernize/UseConstraintsCheck.cpp

@@ -254,7 +254,7 @@ findInsertionForConstraint(const FunctionDecl *Function, ASTContext &Context) {
         return utils::lexer::findPreviousTokenKind(Init->getSourceLocation(),
                                                    SM, LangOpts, tok::colon);
     }
-    if (Constructor->init_begin() != Constructor->init_end())
+    if (!Constructor->inits().empty())
       return std::nullopt;
   }
   if (Function->isDeleted()) {