241 lines · cpp
1// RUN: %check_clang_tidy %s misc-unused-using-decls %t -- --fix-notes -- -fno-delayed-template-parsing -isystem %S/Inputs2 3// ----- Definitions -----4template <typename T> class vector {};5namespace n {6class A;7class B;8class C;9class D;10class D { public: static int i; };11template <typename T> class E {};12template <typename T> class F {};13class G { public: static void func() {} };14class H { public: static int i; };15class I {16 public:17 static int ii;18};19template <typename T> class J {};20class G;21class H;22 23template <typename T> class K {};24template <template <typename> class S>25class L {};26 27template <typename T> class M {};28class N {};29 30template <int T> class P {};31const int Constant = 0;32 33template <typename T> class Q {};34 35class Base {36 public:37 void f();38};39 40D UsedInstance;41D UnusedInstance;42 43int UsedFunc() { return 1; }44int UnusedFunc() { return 1; }45template <typename T> int UsedTemplateFunc() { return 1; }46template <typename T> int UnusedTemplateFunc() { return 1; }47template <typename T> int UsedInTemplateFunc() { return 1; }48void OverloadFunc(int);49void OverloadFunc(double);50int FuncUsedByUsingDeclInMacro() { return 1; }51long double operator""_w(long double);52 53class ostream {54public:55 ostream &operator<<(ostream &(*PF)(ostream &));56};57extern ostream cout;58ostream &endl(ostream &os);59 60enum Color1 { Green };61 62enum Color2 { Red };63 64enum Color3 { Yellow };65 66enum Color4 { Blue };67 68} // namespace n69 70#include "unused-using-decls.h"71namespace ns {72template <typename T>73class AA {74 T t;75};76template <typename T>77T ff() { T t; return t; }78} // namespace ns79 80// ----- Using declarations -----81// eol-comments aren't removed (yet)82using n::A; // A83// CHECK-MESSAGES: :[[@LINE-1]]:10: warning: using decl 'A' is unused84// CHECK-MESSAGES: :[[@LINE-2]]:10: note: remove the using85// CHECK-FIXES: // A86using n::B;87using n::C;88using n::D;89using n::E; // E90// CHECK-MESSAGES: :[[@LINE-1]]:10: warning: using decl 'E' is unused91// CHECK-FIXES: // E92using n::F;93using n::G;94using n::H;95using n::I;96int I::ii = 1;97class Derived : public n::Base {98 public:99 using Base::f;100};101using n::UsedInstance;102using n::UsedFunc;103using n::UsedTemplateFunc;104using n::UnusedInstance; // UnusedInstance105// CHECK-MESSAGES: :[[@LINE-1]]:10: warning: using decl 'UnusedInstance' is unused106// CHECK-FIXES: // UnusedInstance107using n::UnusedFunc; // UnusedFunc108// CHECK-MESSAGES: :[[@LINE-1]]:10: warning: using decl 'UnusedFunc' is unused109// CHECK-FIXES: // UnusedFunc110using n::operator""_w;111using n::cout;112using n::endl;113 114using n::UsedInTemplateFunc;115using n::J;116template <typename T> void Callee() {117 J<T> j;118 UsedInTemplateFunc<T>();119}120 121using n::OverloadFunc; // OverloadFunc122// CHECK-MESSAGES: :[[@LINE-1]]:10: warning: using decl 'OverloadFunc' is unused123// CHECK-FIXES: // OverloadFunc124 125#define DEFINE_INT(name) \126 namespace INT { \127 static const int _##name = 1; \128 } \129 using INT::_##name130DEFINE_INT(test);131#undef DEFIND_INT132 133#define USING_FUNC \134 using n::FuncUsedByUsingDeclInMacro;135USING_FUNC136#undef USING_FUNC137 138namespace N1 {139// n::G is used in namespace N2.140// Currently, the check doesn't support multiple scopes. All the relevant141// using-decls will be marked as used once we see an usage even the usage is in142// other scope.143using n::G;144}145 146namespace N2 {147using n::G;148void f(G g);149}150 151void IgnoreFunctionScope() {152// Using-decls defined in function scope will be ignored.153using n::H;154}155 156using n::Color1;157// CHECK-MESSAGES: :[[@LINE-1]]:10: warning: using decl 'Color1' is unused158using n::Green;159// CHECK-MESSAGES: :[[@LINE-1]]:10: warning: using decl 'Green' is unused160using n::Color2;161using n::Color3;162using n::Blue;163 164using ns::AA;165using ns::ff;166 167using n::K;168 169using n::N;170 171// FIXME: Currently non-type template arguments are not supported.172using n::Constant;173// CHECK-MESSAGES: :[[@LINE-1]]:10: warning: using decl 'Constant' is unused174 175using n::Q;176 177// ----- Usages -----178void f(B b);179void g() {180 vector<C> data;181 D::i = 1;182 F<int> f;183 void (*func)() = &G::func;184 int *i = &H::i;185 UsedInstance.i;186 UsedFunc();187 UsedTemplateFunc<int>();188 1.5_w;189 cout << endl;190 Color2 color2;191 int t1 = Color3::Yellow;192 int t2 = Blue;193 194 MyClass a;195 int t3 = 0;196 a.func1<AA>(&t3);197 a.func2<int, ff>(t3);198 199 n::L<K> l;200}201 202template<class T>203void h(n::M<T>* t) {}204// n::N is used the explicit template instantiation.205template void h(n::M<N>* t);206 207// Test on Non-type template arguments.208template <int T>209void i(n::P<T>* t) {}210template void i(n::P<Constant>* t);211 212template <typename T, template <typename> class U> class Bar {};213// We used to report Q unsued, because we only checked the first template214// argument.215Bar<int, Q> *bar;216 217namespace gh69714 {218struct StructGH69714_1 {};219struct StructGH69714_2 {};220} // namespace gh69714221using gh69714::StructGH69714_1;222using gh69714::StructGH69714_2;223struct StructGH69714_1 a;224struct StructGH69714_2 *b;225 226namespace gh53444 {227namespace my_literals {228 template <char... Ts>229 int operator""_r() {230 return {};231 }232}233 234using my_literals::operator"" _r;235 236int foo() {237 auto x2 = 123_r;238}239 240}241