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// RUN: %check_clang_tidy %s misc-unused-using-decls %t -- -- -fno-delayed-template-parsing -isystem %S/Inputs/
// ----- Definitions -----
template <typename T> class vector {};
namespace n {
class A;
class B;
class C;
class D;
class D { public: static int i; };
template <typename T> class E {};
template <typename T> class F {};
class G { public: static void func() {} };
class H { public: static int i; };
class I {
public:
static int ii;
};
template <typename T> class J {};
class G;
class H;
template <typename T> class K {};
template <template <typename> class S>
class L {};
template <typename T> class M {};
class N {};
template <int T> class P {};
const int Constant = 0;
class Base {
public:
void f();
};
D UsedInstance;
D UnusedInstance;
int UsedFunc() { return 1; }
int UnusedFunc() { return 1; }
template <typename T> int UsedTemplateFunc() { return 1; }
template <typename T> int UnusedTemplateFunc() { return 1; }
template <typename T> int UsedInTemplateFunc() { return 1; }
void OverloadFunc(int);
void OverloadFunc(double);
int FuncUsedByUsingDeclInMacro() { return 1; }
class ostream {
public:
ostream &operator<<(ostream &(*PF)(ostream &));
};
extern ostream cout;
ostream &endl(ostream &os);
enum Color1 { Green };
enum Color2 { Red };
enum Color3 { Yellow };
enum Color4 { Blue };
} // namespace n
#include "unused-using-decls.h"
namespace ns {
template <typename T>
class AA {
T t;
};
template <typename T>
T ff() { T t; return t; }
} // namespace ns
// ----- Using declarations -----
// eol-comments aren't removed (yet)
using n::A; // A
// CHECK-MESSAGES: :[[@LINE-1]]:10: warning: using decl 'A' is unused
// CHECK-FIXES: {{^}}// A
using n::B;
using n::C;
using n::D;
using n::E; // E
// CHECK-MESSAGES: :[[@LINE-1]]:10: warning: using decl 'E' is unused
// CHECK-FIXES: {{^}}// E
using n::F;
using n::G;
using n::H;
using n::I;
int I::ii = 1;
class Derived : public n::Base {
public:
using Base::f;
};
using n::UsedInstance;
using n::UsedFunc;
using n::UsedTemplateFunc;
using n::UnusedInstance; // UnusedInstance
// CHECK-MESSAGES: :[[@LINE-1]]:10: warning: using decl 'UnusedInstance' is unused
// CHECK-FIXES: {{^}}// UnusedInstance
using n::UnusedFunc; // UnusedFunc
// CHECK-MESSAGES: :[[@LINE-1]]:10: warning: using decl 'UnusedFunc' is unused
// CHECK-FIXES: {{^}}// UnusedFunc
using n::cout;
using n::endl;
using n::UsedInTemplateFunc;
using n::J;
template <typename T> void Callee() {
J<T> j;
UsedInTemplateFunc<T>();
}
using n::OverloadFunc; // OverloadFunc
// CHECK-MESSAGES: :[[@LINE-1]]:10: warning: using decl 'OverloadFunc' is unused
// CHECK-FIXES: {{^}}// OverloadFunc
#define DEFINE_INT(name) \
namespace INT { \
static const int _##name = 1; \
} \
using INT::_##name
DEFINE_INT(test);
#undef DEFIND_INT
#define USING_FUNC \
using n::FuncUsedByUsingDeclInMacro;
USING_FUNC
#undef USING_FUNC
namespace N1 {
// n::G is used in namespace N2.
// Currently, the check doesn't support multiple scopes. All the relevant
// using-decls will be marked as used once we see an usage even the usage is in
// other scope.
using n::G;
}
namespace N2 {
using n::G;
void f(G g);
}
void IgnoreFunctionScope() {
// Using-decls defined in function scope will be ignored.
using n::H;
}
using n::Color1;
// CHECK-MESSAGES: :[[@LINE-1]]:10: warning: using decl 'Color1' is unused
using n::Green;
// CHECK-MESSAGES: :[[@LINE-1]]:10: warning: using decl 'Green' is unused
using n::Color2;
using n::Color3;
using n::Blue;
using ns::AA;
using ns::ff;
using n::K;
using n::N;
// FIXME: Currently non-type template arguments are not supported.
using n::Constant;
// CHECK-MESSAGES: :[[@LINE-1]]:10: warning: using decl 'Constant' is unused
// ----- Usages -----
void f(B b);
void g() {
vector<C> data;
D::i = 1;
F<int> f;
void (*func)() = &G::func;
int *i = &H::i;
UsedInstance.i;
UsedFunc();
UsedTemplateFunc<int>();
cout << endl;
Color2 color2;
int t1 = Color3::Yellow;
int t2 = Blue;
MyClass a;
int t3 = 0;
a.func1<AA>(&t3);
a.func2<int, ff>(t3);
n::L<K> l;
}
template<class T>
void h(n::M<T>* t) {}
// n::N is used the explicit template instantiation.
template void h(n::M<N>* t);
// Test on Non-type template arguments.
template <int T>
void i(n::P<T>* t) {}
template void i(n::P<Constant>* t);
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