================
@@ -0,0 +1,677 @@
+// RUN: %check_clang_tidy -check-suffix=,CPP20ORLATER -std=c++20-or-later %s
modernize-use-structured-binding %t -- -- -I %S/Inputs/use-structured-binding/
+// RUN: %check_clang_tidy -std=c++17 %s modernize-use-structured-binding %t --
-- -I %S/Inputs/use-structured-binding/
+#include "fake_std_pair_tuple.h"
+
+template<typename T>
+void MarkUsed(T x);
+
+struct TestClass {
+ int a;
+ int b;
+ TestClass() : a(0), b(0) {}
+ TestClass& operator++();
+ TestClass(int x, int y) : a(x), b(y) {}
+};
+
+void DecomposeByAssignWarnCases() {
+ {
+ auto P = getPair<int, int>();
+ // CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use a structured binding to
decompose a pair [modernize-use-structured-binding]
+ // CHECK-FIXES: auto [x, y] = getPair<int, int>();
+ // CHECK-NEXT: // REMOVE
+ int x = P.first;
+ int y = P.second; // REMOVE
+ // CHECK-FIXES: // REMOVE
+ }
+
+ {
+ auto P = getPair<int, int>();
+ // CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use a structured binding to
decompose a pair [modernize-use-structured-binding]
+ // CHECK-FIXES: auto [x, y] = getPair<int, int>();
+ int x = P.first, y = P.second; // REMOVE
+ // CHECK-FIXES: // REMOVE
+ }
+
+ {
+ auto P = getPair<int, int>();
+ // CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use a structured binding to
decompose a pair [modernize-use-structured-binding]
+ // CHECK-FIXES: auto [x, y] = getPair<int, int>();
+ int x = P.first, y = P.second; // REMOVE
+ // CHECK-FIXES: // REMOVE
+ int z;
+ }
+
+ {
+ auto P = getPair<int, int>();
+ // CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use a structured binding to
decompose a pair [modernize-use-structured-binding]
+ // CHECK-FIXES: auto [x, y] = getPair<int, int>();
+ // CHECK-NEXT: // REMOVE
+ int x = P.first;
+ auto y = P.second; // REMOVE
+ // CHECK-FIXES: // REMOVE
+ }
+
+ {
+ const auto P = getPair<int, int>();
+ // CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use a structured binding to
decompose a pair [modernize-use-structured-binding]
+ // CHECK-FIXES: const auto [x, y] = getPair<int, int>();
+ // CHECK-NEXT: // REMOVE
+ const int x = P.first;
+ const auto y = P.second; // REMOVE
+ // CHECK-FIXES: // REMOVE
+ }
+
+ {
+ std::pair<int, int> otherP;
+ auto& P = otherP;
+ // CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use a structured binding to
decompose a pair [modernize-use-structured-binding]
+ // CHECK-FIXES: auto& [x, y] = otherP;
+ // CHECK-NEXT: // REMOVE
+ int& x = P.first;
+ auto& y = P.second; // REMOVE
+ // CHECK-FIXES: // REMOVE
+ }
+
+ {
+ std::pair<int, int> otherP;
+ const auto& P = otherP;
+ // CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use a structured binding to
decompose a pair [modernize-use-structured-binding]
+ // CHECK-FIXES: const auto& [x, y] = otherP;
+ // CHECK-NEXT: // REMOVE
+ const int& x = P.first;
+ const auto& y = P.second; // REMOVE
+ // CHECK-FIXES: // REMOVE
+ }
+
+ {
+ auto P = getPair<int, int>();
+ // CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use a structured binding to
decompose a pair [modernize-use-structured-binding]
+ // CHECK-FIXES: auto [x, y] = getPair<int, int>();
+ // CHECK-NEXT: // REMOVE
+ int x = P.first;
+ int y = P.second; // REMOVE
+ // CHECK-FIXES: // REMOVE
+
+ auto another_p = getPair<int, int>();
+ // CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use a structured binding to
decompose a pair [modernize-use-structured-binding]
+ // CHECK-FIXES: auto [another_x, another_y] = getPair<int, int>();
+ // CHECK-NEXT: // REMOVE
+ int another_x = another_p.first;
+ int another_y = another_p.second; // REMOVE
+ // CHECK-FIXES: // REMOVE
+ }
+}
+
+void forRangeWarnCases() {
+ std::pair<int, int> Pairs[10];
+ for (auto P : Pairs) {
+ // CHECK-MESSAGES: :[[@LINE-1]]:8: warning: use a structured binding to
decompose a pair [modernize-use-structured-binding]
+ // CHECK-FIXES: for (auto [x, y] : Pairs) {
+ // CHECK-NEXT: // REMOVE
+ int x = P.first;
+ int y = P.second; // REMOVE
+ // CHECK-FIXES: // REMOVE
+ }
+
+ for (auto P : Pairs) {
+ // CHECK-MESSAGES: :[[@LINE-1]]:8: warning: use a structured binding to
decompose a pair [modernize-use-structured-binding]
+ // CHECK-FIXES: for (auto [x, y] : Pairs) {
+ int x = P.first, y = P.second; // REMOVE
+ // CHECK-FIXES: // REMOVE
+ }
+
+ for (auto P : Pairs) {
+ // CHECK-MESSAGES: :[[@LINE-1]]:8: warning: use a structured binding to
decompose a pair [modernize-use-structured-binding]
+ // CHECK-FIXES: for (auto [x, y] : Pairs) {
+ int x = P.first, y = P.second; // REMOVE
+ // CHECK-FIXES: // REMOVE
+ int z;
+ }
+
+ for (const auto P : Pairs) {
+ // CHECK-MESSAGES: :[[@LINE-1]]:8: warning: use a structured binding to
decompose a pair [modernize-use-structured-binding]
+ // CHECK-FIXES: for (const auto [x, y] : Pairs) {
+ // CHECK-NEXT: // REMOVE
+ const int x = P.first;
+ const int y = P.second; // REMOVE
+ // CHECK-FIXES: // REMOVE
+ }
+
+ for (auto& P : Pairs) {
+ // CHECK-MESSAGES: :[[@LINE-1]]:8: warning: use a structured binding to
decompose a pair [modernize-use-structured-binding]
+ // CHECK-FIXES: for (auto& [x, y] : Pairs) {
+ // CHECK-NEXT: // REMOVE
+ int& x = P.first;
+ int& y = P.second; // REMOVE
+ // CHECK-FIXES: // REMOVE
+ }
+
+ for (const auto& P : Pairs) {
+ // CHECK-MESSAGES: :[[@LINE-1]]:8: warning: use a structured binding to
decompose a pair [modernize-use-structured-binding]
+ // CHECK-FIXES: for (const auto& [x, y] : Pairs) {
+ // CHECK-NEXT: // REMOVE
+ const int& x = P.first;
+ const int& y = P.second; // REMOVE
+ // CHECK-FIXES: // REMOVE
+ }
+
+ std::pair<TestClass, TestClass> ClassPairs[10];
+ for (auto P : ClassPairs) {
+ // CHECK-MESSAGES: :[[@LINE-1]]:8: warning: use a structured binding to
decompose a pair [modernize-use-structured-binding]
+ // CHECK-FIXES: for (auto [c1, c2] : ClassPairs) {
+ // CHECK-NEXT: // REMOVE
+ TestClass c1 = P.first;
+ TestClass c2 = P.second; // REMOVE
+ // CHECK-FIXES: // REMOVE
+ }
+
+ for (const auto P : ClassPairs) {
+ // CHECK-MESSAGES: :[[@LINE-1]]:8: warning: use a structured binding to
decompose a pair [modernize-use-structured-binding]
+ // CHECK-FIXES: for (const auto [c1, c2] : ClassPairs) {
+ // CHECK-NEXT: // REMOVE
+ const TestClass c1 = P.first;
+ const TestClass c2 = P.second; // REMOVE
+ // CHECK-FIXES: // REMOVE
+ }
+}
+
+void forRangeNotWarnCases() {
+ std::pair<int, int> Pairs[10];
+ for (auto P : Pairs) {
+ int x = P.first;
+ MarkUsed(x);
+ int y = P.second;
+ }
+
+ for (auto P : Pairs) {
+ MarkUsed(P);
+ int x = P.first;
+ int y = P.second;
+ }
+
+ for (auto P : Pairs) {
+ int x = P.first;
+ int y = P.second;
+ MarkUsed(P);
+ }
+
+ std::pair<TestClass, TestClass> ClassPairs[10];
+ for (auto P : ClassPairs) {
+ TestClass c1 = P.first;
+ ++ c1 ;
+ TestClass c2 = P.second;
+ }
+
+ int c;
+ for (auto P : ClassPairs) {
+ TestClass c1 = P.first;
+ c ++ ;
+ TestClass c2 = P.second;
+ }
+}
+
+void stdTieWarnCases() {
+ // CHECK-NEXT: // REMOVE
+ int a = 0;
+ int b = 0; // REMOVE
+ // CHECK-FIXES: // REMOVE
+ std::tie(a, b) = getPair<int, int>();
+ // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: use a structured binding to
decompose a pair [modernize-use-structured-binding]
+ // CHECK-FIXES: auto [a, b] = getPair<int, int>();
+
+ int x = 0, y = 0; // REMOVE
+ // CHECK-FIXES: // REMOVE
+ std::tie(x, y) = getPair<int, int>();
+ // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: use a structured binding to
decompose a pair [modernize-use-structured-binding]
+ // CHECK-FIXES: auto [x, y] = getPair<int, int>();
+
+ // CHECK-NEXT: // REMOVE
+ int* pa = nullptr;
+ int* pb = nullptr; // REMOVE
+ // CHECK-FIXES: // REMOVE
+ std::tie(pa, pb) = getPair<int*, int*>();
+ // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: use a structured binding to
decompose a pair [modernize-use-structured-binding]
+ // CHECK-FIXES: auto [pa, pb] = getPair<int*, int*>();
+
+ // CHECK-NEXT: // REMOVE
+ TestClass c1 (1, 2);
+ TestClass c2 = TestClass {3, 4}; // REMOVE
+ // CHECK-FIXES: // REMOVE
+ std::tie(c1, c2) = getPair<TestClass, TestClass>();
+ // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: use a structured binding to
decompose a pair [modernize-use-structured-binding]
+ // CHECK-FIXES: auto [c1, c2] = getPair<TestClass, TestClass>();
+}
+
+void stdTieNotWarnCases() {
+ int a = 0;
+ int b = 0;
+ a = 4;
+ std::tie(a, b) = getPair<int, int>(); // no warning
+
+ int c = 0, d = 0;
+ int e = 0;
+ std::tie(a, b) = getPair<int, int>(); // no warning
+
+ int* pa = nullptr;
+ int* pb = nullptr;
+ MarkUsed(pa);
+ std::tie(pa, pb) = getPair<int*, int*>(); // no warning
+
+ TestClass c1 (1, 2);
+ TestClass c2 = TestClass {3, 4};
+ MarkUsed(c2);
+ std::tie(c1, c2) = getPair<TestClass, TestClass>();
+}
+
+void NotWarnForVarHasSpecifiers() {
+ {
+ auto P = getPair<int, int>();
+ const int x = P.first;
+ int y = P.second;
+ }
+
+ {
+ auto P = getPair<int, int>();
+ volatile int x = P.first;
+ int y = P.second;
+ }
+
+ {
+ auto P = getPair<int, int>();
+ int x = P.first;
+ [[maybe_unused]] int y = P.second;
+ }
+
+ {
+ static auto P = getPair<int, int>();
+ int x = P.first;
+ int y = P.second;
+ }
+
+ {
+ thread_local auto P = getPair<int, int>();
+ int x = P.first;
+ int y = P.second;
+ }
+
+ {
+ extern int a;
+ int b = 0;
+ std::tie(a, b) = getPair<int, int>();
+ }
+}
+
+void NotWarnForMultiUsedPairVar() {
+ {
+ auto P = getPair<int, int>();
+ int x = P.first;
+ int y = P.second;
+ MarkUsed(P);
+ }
+
+ {
+ auto P = getPair<int, int>();
+ int x = P.first;
+ MarkUsed(P);
+ int y = P.second;
+ }
+
+ {
+ auto P = getPair<int, int>();
+ MarkUsed(P);
+ int x = P.first;
+ int y = P.second;
+ }
+
+ {
+ std::pair<int, int> Pairs[10];
+ for (auto P : Pairs) {
+ int x = P.first;
+ int y = P.second;
+
+ MarkUsed(P);
+ }
+ }
+}
+
+#define DECOMPOSE(P) \
+ int x = P.first; \
+ int y = P.second; \
+
+void NotWarnForMacro1() {
+ auto P = getPair<int, int>();
+ DECOMPOSE(P);
+}
+
+#define GETPAIR auto P = getPair<int, int>()
+
+void NotWarnForMacro2() {
+ GETPAIR;
+ int x = P.first;
+ int y = P.second;
+}
+
+void captureByVal() {
+ auto P = getPair<int, int>();
+ // CHECK-MESSAGES-CPP20ORLATER: :[[@LINE-1]]:3: warning: use a structured
binding to decompose a pair [modernize-use-structured-binding]
+ // CHECK-FIXES-CPP20ORLATER: auto [x, y] = getPair<int, int>();
+ // CHECK-NEXT-CPP20ORLATER: // REMOVE
+ int x = P.first;
+ int y = P.second; // REMOVE
+ // CHECK-FIXES-CPP20ORLATER: // REMOVE
+
+ auto lambda = [x]() {
+ int y = x;
+ };
+}
+
+void captureByRef() {
+ auto P = getPair<int, int>();
+ // CHECK-MESSAGES-CPP20ORLATER: :[[@LINE-1]]:3: warning: use a structured
binding to decompose a pair [modernize-use-structured-binding]
+ // CHECK-FIXES-CPP20ORLATER: auto [x, y] = getPair<int, int>();
+ // CHECK-NEXT-CPP20ORLATER: // REMOVE
+ int x = P.first;
+ int y = P.second; // REMOVE
+ // CHECK-FIXES-CPP20ORLATER: // REMOVE
+
+ auto lambda = [&x]() {
+ x = 1;
+ };
+}
+
+void captureByAllRef() {
+ auto P = getPair<int, int>();
+ // CHECK-MESSAGES-CPP20ORLATER: :[[@LINE-1]]:3: warning: use a structured
binding to decompose a pair [modernize-use-structured-binding]
+ // CHECK-FIXES-CPP20ORLATER: auto [x, y] = getPair<int, int>();
+ // CHECK-NEXT-CPP20ORLATER: // REMOVE
+ int x = P.first;
+ int y = P.second; // REMOVE
+ // CHECK-FIXES-CPP20ORLATER: // REMOVE
+
+ auto lambda = [&]() {
+ x = 1;
+ };
+}
+
+void deepLambda() {
+ auto P = getPair<int, int>();
+ // CHECK-MESSAGES-CPP20ORLATER: :[[@LINE-1]]:3: warning: use a structured
binding to decompose a pair [modernize-use-structured-binding]
+ // CHECK-FIXES-CPP20ORLATER: auto [x, y] = getPair<int, int>();
+ // CHECK-NEXT-CPP20ORLATER: // REMOVE
+ int x = P.first;
+ int y = P.second; // REMOVE
+ // CHECK-FIXES-CPP20ORLATER: // REMOVE
+
+ {
+ auto lambda = [x]() {
+ int y = x;
+ };
+ }
+}
+
+void forRangeNotWarn() {
+ std::pair<int, int> Pairs[10];
+ for (auto P : Pairs) {
+ // CHECK-MESSAGES-CPP20ORLATER: :[[@LINE-1]]:8: warning: use a structured
binding to decompose a pair [modernize-use-structured-binding]
+ // CHECK-FIXES-CPP20ORLATER: for (auto [x, y] : Pairs) {
+ // CHECK-NEXT-CPP20ORLATER: // REMOVE
+ int x = P.first;
+ int y = P.second; // REMOVE
+ // CHECK-FIXES-CPP20ORLATER: // REMOVE
+
+ auto lambda = [&]() {
+ x = 1;
+ };
+ }
+}
+
+void stdTieNotWarn() {
+ // CHECK-NEXT-CPP20ORLATER: // REMOVE
+ int x = 0;
+ int y = 0; // REMOVE
+ // CHECK-FIXES-CPP20ORLATER: // REMOVE
+ std::tie(x, y) = getPair<int, int>();
+ // CHECK-MESSAGES-CPP20ORLATER: :[[@LINE-1]]:3: warning: use a structured
binding to decompose a pair [modernize-use-structured-binding]
+ // CHECK-FIXES-CPP20ORLATER: auto [x, y] = getPair<int, int>();
+
+ auto lambda = [&x]() {
+ x = 1;
+ };
+}
+
+struct otherPair {
+ int first;
+ int second;
+};
+
+void OtherPairTest() {
+ {
+ auto P = otherPair();
+ // CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use a structured binding to
decompose a pair [modernize-use-structured-binding]
+ // CHECK-FIXES: auto [x, y] = otherPair();
+ // CHECK-NEXT: // REMOVE
+ int x = P.first;
+ int y = P.second; // REMOVE
+ // CHECK-FIXES: // REMOVE
+ }
+
+ {
+ const auto P = otherPair();
+ // CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use a structured binding to
decompose a pair [modernize-use-structured-binding]
+ // CHECK-FIXES: const auto [x, y] = otherPair();
+ // CHECK-NEXT: // REMOVE
+ const int x = P.first;
+ const auto y = P.second; // REMOVE
+ // CHECK-FIXES: // REMOVE
+ }
+
+ {
+ otherPair otherP;
+ auto& P = otherP;
+ // CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use a structured binding to
decompose a pair [modernize-use-structured-binding]
+ // CHECK-FIXES: auto& [x, y] = otherP;
+ // CHECK-NEXT: // REMOVE
+ int& x = P.first;
+ auto& y = P.second; // REMOVE
+ // CHECK-FIXES: // REMOVE
+ }
+
+ {
+ std::pair<int, int> otherP;
+ const auto& P = otherP;
+ // CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use a structured binding to
decompose a pair [modernize-use-structured-binding]
+ // CHECK-FIXES: const auto& [x, y] = otherP;
+ // CHECK-NEXT: // REMOVE
+ const int& x = P.first;
+ const auto& y = P.second; // REMOVE
+ // CHECK-FIXES: // REMOVE
+ }
+}
+
+void OtherPairNotWarnCases() {
+ {
+ auto P = otherPair();
+ const int x = P.first;
+ int y = P.second;
+ }
+
+ {
+ auto P = otherPair();
+ volatile int x = P.first;
+ int y = P.second;
+ }
+
+ {
+ auto P = otherPair();
+ int x = P.first;
+ [[maybe_unused]] int y = P.second;
+ }
+
+ {
+ static auto P = getPair<int, int>();
+ int x = P.first;
+ int y = P.second;
+ }
+}
+
+struct otherNonPair1 {
+ int first;
+ int second;
+
+private:
+ int third;
+};
+
+struct otherNonPair2 {
+ int first;
+ int second;
+ int third;
+};
+
+void OtherNonPairTest() {
+ {
+ auto P = otherNonPair1();
+ int x = P.first;
+ int y = P.second;
+ }
+
+ {
+ auto P = otherNonPair2();
+ int x = P.first;
+ int y = P.second;
+ }
+}
+
+template<typename PairType>
+PairType getCertainPair();
+
+struct ConstFieldPair {
+ const int first;
+ int second;
+};
+
+void ConstFieldPairTests() {
+ {
+ const ConstFieldPair P = getCertainPair<ConstFieldPair>();
+ // CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use a structured binding to
decompose a pair [modernize-use-structured-binding]
+ // CHECK-FIXES: const auto [x, y] = getCertainPair<ConstFieldPair>();
+ // CHECK-NEXT: // REMOVE
+ const int x = P.first;
+ const int y = P.second; // REMOVE
+ // CHECK-FIXES: // REMOVE
+ }
+
+ {
+ const ConstFieldPair& P = getCertainPair<ConstFieldPair>();
+ // CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use a structured binding to
decompose a pair [modernize-use-structured-binding]
+ // CHECK-FIXES: const auto& [x, y] = getCertainPair<ConstFieldPair>();
+ // CHECK-NEXT: // REMOVE
+ const int& x = P.first;
+ const int& y = P.second; // REMOVE
+ // CHECK-FIXES: // REMOVE
+ }
+
+ {
+ ConstFieldPair P = getCertainPair<ConstFieldPair>(); // no warning
+ int x = P.first;
+ int y = P.second;
+ }
+}
+
+struct PointerFieldPair {
+ int* first;
+ int second;
+};
+
+void PointerFieldPairTests() {
+ {
+ PointerFieldPair P = getCertainPair<PointerFieldPair>();
+ // CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use a structured binding to
decompose a pair [modernize-use-structured-binding]
+ // CHECK-FIXES: auto [x, y] = getCertainPair<PointerFieldPair>();
+ // CHECK-NEXT: // REMOVE
+ int* x = P.first;
+ int y = P.second; // REMOVE
+ // CHECK-FIXES: // REMOVE
+ }
+
+ {
+ PointerFieldPair P = getCertainPair<PointerFieldPair>(); // no warning
+ const int* x = P.first;
+ int y = P.second;
+ }
+}
+
+struct ConstRefFieldPair {
+ const int& first;
+ int second;
+ ConstRefFieldPair(int& f, int s) : first(f), second(s) {}
+};
+
+void ConstRefFieldPairTests() {
+ {
+ ConstRefFieldPair P = getCertainPair<ConstRefFieldPair>();
+ // CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use a structured binding to
decompose a pair [modernize-use-structured-binding]
+ // CHECK-FIXES: auto [x, y] = getCertainPair<ConstRefFieldPair>();
+ // CHECK-NEXT: // REMOVE
+ const int& x = P.first;
+ int y = P.second; // REMOVE
+ // CHECK-FIXES: // REMOVE
+ }
+
+ {
+ ConstRefFieldPair P = getCertainPair<ConstRefFieldPair>();; // no warning
+ int x = P.first;
+ int y = P.second;
+ }
+}
+
+struct StaticFieldPair {
+ static int first;
+ int second;
+};
+
+void StaticFieldPairTests() {
+ {
+ StaticFieldPair P; // Should not warn
+ int x = P.first;
+ int y = P.second;
+ }
+
+ {
+ StaticFieldPair P; // Should not warn
+ static int x = P.first;
+ int y = P.second;
+ }
+}
+
+void IgnoreDirectInit() {
+ {
+ std::pair<int, int> P{1, 1};
+ int x = P.first;
+ int y = P.second;
+ }
+
+ {
+ std::pair<int, int> P(1, 1);
+ int x = P.first;
+ int y = P.second;
+ }
+
+ {
+ std::pair<int, int> P;
+ int x = P.first;
+ int y = P.second;
+ }
+}
+
+void StdMapTestCases() {
+ for (auto p : std::unordered_map<int, int>()) {
+ // CHECK-MESSAGES: :[[@LINE-1]]:8: warning: use a structured binding to
decompose a pair [modernize-use-structured-binding]
+ // CHECK-FIXES: for (auto [x, y] : std::unordered_map<int, int>()) {
+ // CHECK-NEXT: // REMOVE
+ int x = p.first;
+ int y = p.second; // REMOVE
+ // CHECK-FIXES: // REMOVE
+ }
+}
+
----------------
vbvictor wrote:
If we have only FN, I think we can leave it as is.
https://github.com/llvm/llvm-project/pull/158462
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