[clang] [clang-tools-extra] [clang-tidy] Add new check `modernize-use-designated-initializers` (PR #80541)

[Piotr Zegar via cfe-commits]

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In-Reply-To: <llvm.org/llvm/llvm-project/pull/80541 at github.com>


================
@@ -0,0 +1,171 @@
+//===--- UseDesignatedInitializersCheck.cpp - clang-tidy ------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "UseDesignatedInitializersCheck.h"
+#include "../utils/DesignatedInitializers.h"
+#include "clang/AST/APValue.h"
+#include "clang/AST/Decl.h"
+#include "clang/AST/Expr.h"
+#include "clang/AST/Stmt.h"
+#include "clang/ASTMatchers/ASTMatchFinder.h"
+#include "clang/ASTMatchers/ASTMatchers.h"
+#include "clang/ASTMatchers/ASTMatchersMacros.h"
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Lex/Lexer.h"
+
+using namespace clang::ast_matchers;
+
+namespace clang::tidy::modernize {
+
+static constexpr char IgnoreSingleElementAggregatesName[] =
+    "IgnoreSingleElementAggregates";
+static constexpr bool IgnoreSingleElementAggregatesDefault = true;
+
+static constexpr char RestrictToPODTypesName[] = "RestrictToPODTypes";
+static constexpr bool RestrictToPODTypesDefault = false;
+
+static constexpr char IgnoreMacrosName[] = "IgnoreMacros";
+static constexpr bool IgnoreMacrosDefault = true;
+
+namespace {
+
+struct Designators {
+
+  Designators(const InitListExpr *InitList) : InitList(InitList) {
+    assert(InitList->isSyntacticForm());
+  };
+
+  unsigned size() { return get().size(); }
+
+  std::optional<llvm::StringRef> operator[](const SourceLocation &Location) {
+    const auto Result = get().find(Location);
+    if (Result == get().end())
----------------
PiotrZSL wrote:

avoid double calls to get()

https://github.com/llvm/llvm-project/pull/80541