| // RUN: %clang_cc1 -fsyntax-only -verify=cxx11 -std=c++11 -Wno-unused -Wno-uninitialized \ |
| // RUN: -Wunsequenced -Wno-c++17-extensions -Wno-c++14-extensions %s |
| // RUN: %clang_cc1 -fsyntax-only -verify=cxx17 -std=c++17 -Wno-unused -Wno-uninitialized \ |
| // RUN: -Wunsequenced -Wno-c++17-extensions -Wno-c++14-extensions %s |
| |
| int f(int, int = 0); |
| |
| struct A { |
| int x, y; |
| }; |
| struct S { |
| S(int, int); |
| int n; |
| }; |
| |
| // TODO: Implement the C++17 sequencing rules. |
| void test() { |
| int a; |
| int xs[10]; |
| ++a = 0; // ok |
| a + ++a; // cxx11-warning {{unsequenced modification and access to 'a'}} |
| // cxx17-warning@-1 {{unsequenced modification and access to 'a'}} |
| a = ++a; // ok |
| a + a++; // cxx11-warning {{unsequenced modification and access to 'a'}} |
| // cxx17-warning@-1 {{unsequenced modification and access to 'a'}} |
| a = a++; // cxx11-warning {{multiple unsequenced modifications to 'a'}} |
| // TODO cxx17-warning@-1 {{multiple unsequenced modifications to 'a'}} |
| ++ ++a; // ok |
| (a++, a++); // ok |
| ++a + ++a; // cxx11-warning {{multiple unsequenced modifications to 'a'}} |
| // cxx17-warning@-1 {{multiple unsequenced modifications to 'a'}} |
| a++ + a++; // cxx11-warning {{multiple unsequenced modifications to 'a'}} |
| // cxx17-warning@-1 {{multiple unsequenced modifications to 'a'}} |
| (a++, a) = 0; // ok, increment is sequenced before value computation of LHS |
| a = xs[++a]; // ok |
| a = xs[a++]; // cxx11-warning {{multiple unsequenced modifications to 'a'}} |
| // TODO cxx17-warning@-1 {{multiple unsequenced modifications to 'a'}} |
| (a ? xs[0] : xs[1]) = ++a; // cxx11-warning {{unsequenced modification and access to 'a'}} |
| // TODO cxx17-warning@-1 {{unsequenced modification and access to 'a'}} |
| a = (++a, ++a); // ok |
| a = (a++, ++a); // ok |
| a = (a++, a++); // cxx11-warning {{multiple unsequenced modifications to 'a'}} |
| // TODO cxx17-warning@-1 {{multiple unsequenced modifications to 'a'}} |
| f(a, a); // ok |
| f(a = 0, a); // cxx11-warning {{unsequenced modification and access to 'a'}} |
| // cxx17-warning@-1 {{unsequenced modification and access to 'a'}} |
| f(a, a += 0); // cxx11-warning {{unsequenced modification and access to 'a'}} |
| // cxx17-warning@-1 {{unsequenced modification and access to 'a'}} |
| f(a = 0, a = 0); // cxx11-warning {{multiple unsequenced modifications to 'a'}} |
| // cxx17-warning@-1 {{multiple unsequenced modifications to 'a'}} |
| a = f(++a); // ok |
| a = f(a++); // ok |
| a = f(++a, a++); // cxx11-warning {{multiple unsequenced modifications to 'a'}} |
| // cxx17-warning@-1 {{multiple unsequenced modifications to 'a'}} |
| |
| // Compound assignment "A OP= B" is equivalent to "A = A OP B" except that A |
| // is evaluated only once. |
| (++a, a) = 1; // ok |
| (++a, a) += 1; // ok |
| a = ++a; // ok |
| a += ++a; // cxx11-warning {{unsequenced modification and access to 'a'}} |
| // TODO cxx17-warning@-1 {{unsequenced modification and access to 'a'}} |
| |
| A agg1 = { a++, a++ }; // ok |
| A agg2 = { a++ + a, a++ }; // cxx11-warning {{unsequenced modification and access to 'a'}} |
| // cxx17-warning@-1 {{unsequenced modification and access to 'a'}} |
| |
| S str1(a++, a++); // cxx11-warning {{multiple unsequenced modifications to 'a'}} |
| // cxx17-warning@-1 {{multiple unsequenced modifications to 'a'}} |
| S str2 = { a++, a++ }; // ok |
| S str3 = { a++ + a, a++ }; // cxx11-warning {{unsequenced modification and access to 'a'}} |
| // cxx17-warning@-1 {{unsequenced modification and access to 'a'}} |
| |
| struct Z { A a; S s; } z = { { ++a, ++a }, { ++a, ++a } }; // ok |
| a = S { ++a, a++ }.n; // ok |
| A { ++a, a++ }.x; // ok |
| a = A { ++a, a++ }.x; // cxx11-warning {{multiple unsequenced modifications to 'a'}} |
| // TODO cxx17-warning@-1 {{multiple unsequenced modifications to 'a'}} |
| A { ++a, a++ }.x + A { ++a, a++ }.y; // cxx11-warning {{multiple unsequenced modifications to 'a'}} |
| // cxx17-warning@-1 {{multiple unsequenced modifications to 'a'}} |
| |
| (xs[2] && (a = 0)) + a; // ok |
| (0 && (a = 0)) + a; // ok |
| (1 && (a = 0)) + a; // cxx11-warning {{unsequenced modification and access to 'a'}} |
| // cxx17-warning@-1 {{unsequenced modification and access to 'a'}} |
| |
| (xs[3] || (a = 0)) + a; // ok |
| (0 || (a = 0)) + a; // cxx11-warning {{unsequenced modification and access to 'a'}} |
| // cxx17-warning@-1 {{unsequenced modification and access to 'a'}} |
| (1 || (a = 0)) + a; // ok |
| |
| (xs[4] ? a : ++a) + a; // ok |
| (0 ? a : ++a) + a; // cxx11-warning {{unsequenced modification and access to 'a'}} |
| // cxx17-warning@-1 {{unsequenced modification and access to 'a'}} |
| (1 ? a : ++a) + a; // ok |
| (0 ? a : a++) + a; // cxx11-warning {{unsequenced modification and access to 'a'}} |
| // cxx17-warning@-1 {{unsequenced modification and access to 'a'}} |
| (1 ? a : a++) + a; // ok |
| (xs[5] ? ++a : ++a) + a; // FIXME: warn here |
| |
| (++a, xs[6] ? ++a : 0) + a; // cxx11-warning {{unsequenced modification and access to 'a'}} |
| // cxx17-warning@-1 {{unsequenced modification and access to 'a'}} |
| |
| // Here, the read of the fourth 'a' might happen before or after the write to |
| // the second 'a'. |
| a += (a++, a) + a; // cxx11-warning {{unsequenced modification and access to 'a'}} |
| // cxx17-warning@-1 {{unsequenced modification and access to 'a'}} |
| |
| int *p = xs; |
| a = *(a++, p); // ok |
| a = a++ && a; // ok |
| p[(long long unsigned)(p = 0)]; // cxx11-warning {{unsequenced modification and access to 'p'}} |
| |
| A *q = &agg1; |
| (q = &agg2)->y = q->x; // cxx11-warning {{unsequenced modification and access to 'q'}} |
| // TODO cxx17-warning@-1 {{unsequenced modification and access to 'q'}} |
| |
| // This has undefined behavior if a == 0; otherwise, the side-effect of the |
| // increment is sequenced before the value computation of 'f(a, a)', which is |
| // sequenced before the value computation of the '&&', which is sequenced |
| // before the assignment. We treat the sequencing in '&&' as being |
| // unconditional. |
| a = a++ && f(a, a); |
| |
| // This has undefined behavior if a != 0. FIXME: We should diagnose this. |
| (a && a++) + a; |
| |
| (xs[7] && ++a) * (!xs[7] && ++a); // ok |
| |
| xs[0] = (a = 1, a); // ok |
| (a -= 128) &= 128; // ok |
| ++a += 1; // ok |
| |
| xs[8] ? ++a + a++ : 0; // cxx11-warning {{multiple unsequenced modifications to 'a'}} |
| // cxx17-warning@-1 {{multiple unsequenced modifications to 'a'}} |
| xs[8] ? 0 : ++a + a++; // cxx11-warning {{multiple unsequenced modifications to 'a'}} |
| // cxx17-warning@-1 {{multiple unsequenced modifications to 'a'}} |
| xs[8] ? ++a : a++; // ok |
| |
| xs[8] && (++a + a++); // cxx11-warning {{multiple unsequenced modifications to 'a'}} |
| // cxx17-warning@-1 {{multiple unsequenced modifications to 'a'}} |
| xs[8] || (++a + a++); // cxx11-warning {{multiple unsequenced modifications to 'a'}} |
| // cxx17-warning@-1 {{multiple unsequenced modifications to 'a'}} |
| |
| (__builtin_classify_type(++a) ? 1 : 0) + ++a; // ok |
| (__builtin_constant_p(++a) ? 1 : 0) + ++a; // ok |
| (__builtin_object_size(&(++a, a), 0) ? 1 : 0) + ++a; // ok |
| (__builtin_expect(++a, 0) ? 1 : 0) + ++a; // cxx11-warning {{multiple unsequenced modifications to 'a'}} |
| // cxx17-warning@-1 {{multiple unsequenced modifications to 'a'}} |
| } |
| |
| namespace members { |
| |
| struct S1 { |
| unsigned bf1 : 2; |
| unsigned bf2 : 2; |
| unsigned a; |
| unsigned b; |
| static unsigned x; |
| void member_f(S1 &s); |
| }; |
| |
| void S1::member_f(S1 &s) { |
| ++a + ++a; // cxx11-warning {{multiple unsequenced modifications to 'a'}} |
| // cxx17-warning@-1 {{multiple unsequenced modifications to 'a'}} |
| a + ++a; // cxx11-warning {{unsequenced modification and access to 'a'}} |
| // cxx17-warning@-1 {{unsequenced modification and access to 'a'}} |
| ++a + ++b; // no-warning |
| a + ++b; // no-warning |
| |
| // TODO: Warn here. |
| ++s.a + ++s.a; // no-warning TODO {{multiple unsequenced modifications to}} |
| s.a + ++s.a; // no-warning TODO {{unsequenced modification and access to}} |
| ++s.a + ++s.b; // no-warning |
| s.a + ++s.b; // no-warning |
| |
| ++a + ++s.a; // no-warning |
| a + ++s.a; // no-warning |
| ++a + ++s.b; // no-warning |
| a + ++s.b; // no-warning |
| |
| // TODO Warn here for bit-fields in the same memory location. |
| ++bf1 + ++bf1; // cxx11-warning {{multiple unsequenced modifications to 'bf1'}} |
| // cxx17-warning@-1 {{multiple unsequenced modifications to 'bf1'}} |
| bf1 + ++bf1; // cxx11-warning {{unsequenced modification and access to 'bf1'}} |
| // cxx17-warning@-1 {{unsequenced modification and access to 'bf1'}} |
| ++bf1 + ++bf2; // no-warning TODO {{multiple unsequenced modifications to}} |
| bf1 + ++bf2; // no-warning TODO {{unsequenced modification and access to}} |
| |
| // TODO Warn here for bit-fields in the same memory location. |
| ++s.bf1 + ++s.bf1; // no-warning TODO {{multiple unsequenced modifications to}} |
| s.bf1 + ++s.bf1; // no-warning TODO {{unsequenced modification and access to}} |
| ++s.bf1 + ++s.bf2; // no-warning TODO {{multiple unsequenced modifications to}} |
| s.bf1 + ++s.bf2; // no-warning TODO {{unsequenced modification and access to}} |
| |
| ++bf1 + ++s.bf1; // no-warning |
| bf1 + ++s.bf1; // no-warning |
| ++bf1 + ++s.bf2; // no-warning |
| bf1 + ++s.bf2; // no-warning |
| |
| struct Der : S1 {}; |
| Der d; |
| Der &d_ref = d; |
| S1 &s1_ref = d_ref; |
| |
| ++s1_ref.a + ++d_ref.a; // no-warning TODO {{multiple unsequenced modifications to member 'a' of 'd'}} |
| ++s1_ref.a + d_ref.a; // no-warning TODO {{unsequenced modification and access to member 'a' of 'd'}} |
| ++s1_ref.a + ++d_ref.b; // no-warning |
| ++s1_ref.a + d_ref.b; // no-warning |
| |
| ++x + ++x; // cxx11-warning {{multiple unsequenced modifications to 'x'}} |
| // cxx17-warning@-1 {{multiple unsequenced modifications to 'x'}} |
| ++x + x; // cxx11-warning {{unsequenced modification and access to 'x'}} |
| // cxx17-warning@-1 {{unsequenced modification and access to 'x'}} |
| ++s.x + x; // no-warning TODO {{unsequenced modification and access to static member 'x' of 'S1'}} |
| ++this->x + x; // cxx11-warning {{unsequenced modification and access to 'x'}} |
| // cxx17-warning@-1 {{unsequenced modification and access to 'x'}} |
| ++d_ref.x + ++S1::x; // no-warning TODO {{unsequenced modification and access to static member 'x' of 'S1'}} |
| } |
| |
| struct S2 { |
| union { unsigned x, y; }; |
| void f2(); |
| }; |
| |
| void S2::f2() { |
| ++x + ++x; // no-warning TODO {{multiple unsequenced modifications to}} |
| x + ++x; // no-warning TODO {{unsequenced modification and access to}} |
| ++x + ++y; // no-warning |
| x + ++y; // no-warning |
| } |
| |
| void f2(S2 &s) { |
| ++s.x + ++s.x; // no-warning TODO {{multiple unsequenced modifications to}} |
| s.x + ++s.x; // no-warning TODO {{unsequenced modification and access to}} |
| ++s.x + ++s.y; // no-warning |
| s.x + ++s.y; // no-warning |
| } |
| |
| struct S3 { |
| union { |
| union { |
| unsigned x; |
| }; |
| }; |
| unsigned y; |
| void f3(); |
| }; |
| |
| void S3::f3() { |
| ++x + ++x; // no-warning TODO {{multiple unsequenced modifications to}} |
| x + ++x; // no-warning TODO {{unsequenced modification and access to}} |
| ++x + ++y; // no-warning |
| x + ++y; // no-warning |
| } |
| |
| void f3(S3 &s) { |
| ++s.x + ++s.x; // no-warning TODO {{multiple unsequenced modifications to}} |
| s.x + ++s.x; // no-warning TODO {{unsequenced modification and access to}} |
| ++s.x + ++s.y; // no-warning |
| s.x + ++s.y; // no-warning |
| } |
| |
| struct S4 : S3 { |
| unsigned y; |
| void f4(); |
| }; |
| |
| void S4::f4() { |
| ++x + ++x; // no-warning TODO {{multiple unsequenced modifications to}} |
| x + ++x; // no-warning TODO {{unsequenced modification and access to}} |
| ++x + ++y; // no-warning |
| x + ++y; // no-warning |
| ++S3::y + ++y; // no-warning |
| S3::y + ++y; // no-warning |
| } |
| |
| void f4(S4 &s) { |
| ++s.x + ++s.x; // no-warning TODO {{multiple unsequenced modifications to}} |
| s.x + ++s.x; // no-warning TODO {{unsequenced modification and access to}} |
| ++s.x + ++s.y; // no-warning |
| s.x + ++s.y; // no-warning |
| ++s.S3::y + ++s.y; // no-warning |
| s.S3::y + ++s.y; // no-warning |
| } |
| |
| static union { |
| unsigned Ux; |
| unsigned Uy; |
| }; |
| |
| void f5() { |
| ++Ux + ++Ux; // no-warning TODO {{multiple unsequenced modifications to}} |
| Ux + ++Ux; // no-warning TODO {{unsequenced modification and access to}} |
| ++Ux + ++Uy; // no-warning |
| Ux + ++Uy; // no-warning |
| } |
| |
| void f6() { |
| struct S { unsigned x, y; } s; |
| ++s.x + ++s.x; // no-warning TODO {{multiple unsequenced modifications to}} |
| s.x + ++s.x; // no-warning TODO {{unsequenced modification and access to}} |
| ++s.x + ++s.y; // no-warning |
| s.x + ++s.y; // no-warning |
| |
| struct { unsigned x, y; } t; |
| ++t.x + ++t.x; // no-warning TODO {{multiple unsequenced modifications to}} |
| t.x + ++t.x; // no-warning TODO {{unsequenced modification and access to}} |
| ++t.x + ++t.y; // no-warning |
| t.x + ++t.y; // no-warning |
| } |
| |
| } // namespace members |
| |
| namespace references { |
| void reference_f() { |
| // TODO: Check that we can see through references. |
| // For now this is completely unhandled. |
| int a; |
| int xs[10]; |
| int &b = a; |
| int &c = b; |
| int &ra1 = c; |
| int &ra2 = b; |
| int other; |
| |
| ++ra1 + ++ra2; // no-warning TODO {{multiple unsequenced modifications to}} |
| ra1 + ++ra2; // no-warning TODO {{unsequenced modification and access to}} |
| ++ra1 + ++other; // no-warning |
| ra1 + ++other; // no-warning |
| |
| // Make sure we handle reference cycles. |
| int &ref_cycle = ref_cycle; |
| ++ref_cycle + ++ref_cycle; // cxx11-warning {{multiple unsequenced modifications to 'ref_cycle'}} |
| // cxx17-warning@-1 {{multiple unsequenced modifications to 'ref_cycle'}} |
| ref_cycle + ++ref_cycle; // cxx11-warning {{unsequenced modification and access to 'ref_cycle'}} |
| // cxx17-warning@-1 {{unsequenced modification and access to 'ref_cycle'}} |
| } |
| } // namespace references |
| |
| namespace std { |
| using size_t = decltype(sizeof(0)); |
| template<typename> struct tuple_size; |
| template<size_t, typename> struct tuple_element { using type = int; }; |
| } |
| namespace bindings { |
| |
| struct A { int x, y; }; |
| typedef int B[2]; |
| struct C { template<int> int get(); }; |
| struct D : A {}; |
| |
| } // namespace bindings |
| template<> struct std::tuple_size<bindings::C> { enum { value = 2 }; }; |
| namespace bindings { |
| void testa() { |
| A a; |
| { |
| auto [x, y] = a; |
| ++x + ++x; // cxx11-warning {{multiple unsequenced modifications to 'x'}} |
| // cxx17-warning@-1 {{multiple unsequenced modifications to 'x'}} |
| ++x + x; // cxx11-warning {{unsequenced modification and access to 'x'}} |
| // cxx17-warning@-1 {{unsequenced modification and access to 'x'}} |
| ++x + ++y; // no-warning |
| ++x + y; // no-warning |
| ++x + ++a.x; // no-warning |
| ++x + a.x; // no-warning |
| } |
| { |
| auto &[x, y] = a; |
| ++x + ++x; // cxx11-warning {{multiple unsequenced modifications to 'x'}} |
| // cxx17-warning@-1 {{multiple unsequenced modifications to 'x'}} |
| ++x + x; // cxx11-warning {{unsequenced modification and access to 'x'}} |
| // cxx17-warning@-1 {{unsequenced modification and access to 'x'}} |
| ++x + ++y; // no-warning |
| ++x + y; // no-warning |
| ++x + ++a.x; // no-warning TODO |
| ++x + a.x; // no-warning TODO |
| } |
| } |
| void testb() { |
| B b; |
| { |
| auto [x, y] = b; |
| ++x + ++x; // cxx11-warning {{multiple unsequenced modifications to 'x'}} |
| // cxx17-warning@-1 {{multiple unsequenced modifications to 'x'}} |
| ++x + x; // cxx11-warning {{unsequenced modification and access to 'x'}} |
| // cxx17-warning@-1 {{unsequenced modification and access to 'x'}} |
| ++x + ++y; // no-warning |
| ++x + y; // no-warning |
| ++x + ++b[0]; // no-warning |
| ++x + b[0]; // no-warning |
| } |
| { |
| auto &[x, y] = b; |
| ++x + ++x; // cxx11-warning {{multiple unsequenced modifications to 'x'}} |
| // cxx17-warning@-1 {{multiple unsequenced modifications to 'x'}} |
| ++x + x; // cxx11-warning {{unsequenced modification and access to 'x'}} |
| // cxx17-warning@-1 {{unsequenced modification and access to 'x'}} |
| ++x + ++y; // no-warning |
| ++x + y; // no-warning |
| ++x + ++b[0]; // no-warning TODO |
| ++x + b[0]; // no-warning TODO |
| } |
| } |
| void testc() { |
| C c; |
| { |
| auto [x, y] = c; |
| ++x + ++x; // cxx11-warning {{multiple unsequenced modifications to 'x'}} |
| // cxx17-warning@-1 {{multiple unsequenced modifications to 'x'}} |
| ++x + x; // cxx11-warning {{unsequenced modification and access to 'x'}} |
| // cxx17-warning@-1 {{unsequenced modification and access to 'x'}} |
| ++x + ++y; // no-warning |
| ++x + y; // no-warning |
| } |
| { |
| auto &[x, y] = c; |
| ++x + ++x; // cxx11-warning {{multiple unsequenced modifications to 'x'}} |
| // cxx17-warning@-1 {{multiple unsequenced modifications to 'x'}} |
| ++x + x; // cxx11-warning {{unsequenced modification and access to 'x'}} |
| // cxx17-warning@-1 {{unsequenced modification and access to 'x'}} |
| ++x + ++y; // no-warning |
| ++x + y; // no-warning |
| } |
| } |
| void testd() { |
| D d; |
| { |
| auto [x, y] = d; |
| ++x + ++x; // cxx11-warning {{multiple unsequenced modifications to 'x'}} |
| // cxx17-warning@-1 {{multiple unsequenced modifications to 'x'}} |
| ++x + x; // cxx11-warning {{unsequenced modification and access to 'x'}} |
| // cxx17-warning@-1 {{unsequenced modification and access to 'x'}} |
| ++x + ++y; // no-warning |
| ++x + y; // no-warning |
| ++x + ++d.x; // no-warning |
| ++x + d.x; // no-warning |
| } |
| { |
| auto &[x, y] = d; |
| ++x + ++x; // cxx11-warning {{multiple unsequenced modifications to 'x'}} |
| // cxx17-warning@-1 {{multiple unsequenced modifications to 'x'}} |
| ++x + x; // cxx11-warning {{unsequenced modification and access to 'x'}} |
| // cxx17-warning@-1 {{unsequenced modification and access to 'x'}} |
| ++x + ++y; // no-warning |
| ++x + y; // no-warning |
| ++x + ++d.x; // no-warning TODO |
| ++x + d.x; // no-warning TODO |
| } |
| } |
| } // namespace bindings |
| |
| namespace templates { |
| |
| template <typename T> |
| struct Bar { |
| T get() { return 0; } |
| }; |
| |
| template <typename X> |
| struct Foo { |
| int Run(); |
| Bar<int> bar; |
| }; |
| |
| enum E {e1, e2}; |
| bool operator&&(E, E); |
| |
| void foo(int, int); |
| |
| template <typename X> |
| int Foo<X>::Run() { |
| char num = 0; |
| |
| // Before instantiation, Clang may consider the builtin operator here as |
| // unresolved function calls, and treat the arguments as unordered when |
| // the builtin operator evaluatation is well-ordered. Waiting until |
| // instantiation to check these expressions will prevent false positives. |
| if ((num = bar.get()) < 5 && num < 10) { } |
| if ((num = bar.get()) < 5 || num < 10) { } |
| if (static_cast<E>((num = bar.get()) < 5) || static_cast<E>(num < 10)) { } |
| |
| if (static_cast<E>((num = bar.get()) < 5) && static_cast<E>(num < 10)) { } |
| // cxx11-warning@-1 {{unsequenced modification and access to 'num'}} |
| // cxx17-warning@-2 {{unsequenced modification and access to 'num'}} |
| |
| foo(num++, num++); |
| // cxx11-warning@-1 {{multiple unsequenced modifications to 'num'}} |
| // cxx17-warning@-2 {{multiple unsequenced modifications to 'num'}} |
| return 1; |
| } |
| |
| int x = Foo<int>().Run(); |
| // cxx11-note@-1 {{in instantiation of member function 'templates::Foo<int>::Run'}} |
| // cxx17-note@-2 {{in instantiation of member function 'templates::Foo<int>::Run'}} |
| |
| |
| template <typename T> |
| int Run2() { |
| T t = static_cast<T>(0); |
| return (t = static_cast<T>(1)) && t; |
| // cxx11-warning@-1 {{unsequenced modification and access to 't'}} |
| // cxx17-warning@-2 {{unsequenced modification and access to 't'}} |
| } |
| |
| int y = Run2<bool>(); |
| int z = Run2<E>(); |
| // cxx11-note@-1{{in instantiation of function template specialization 'templates::Run2<templates::E>' requested here}} |
| // cxx17-note@-2{{in instantiation of function template specialization 'templates::Run2<templates::E>' requested here}} |
| |
| template <typename T> int var = sizeof(T); |
| void test_var() { |
| var<int>++ + var<int>++; // cxx11-warning {{multiple unsequenced modifications to 'var<int>'}} |
| // cxx17-warning@-1 {{multiple unsequenced modifications to 'var<int>'}} |
| var<int>++ + var<int>; // cxx11-warning {{unsequenced modification and access to 'var<int>'}} |
| // cxx17-warning@-1 {{unsequenced modification and access to 'var<int>'}} |
| int &r = var<int>; |
| r++ + var<int>++; // no-warning TODO {{multiple unsequenced modifications to 'var<int>'}} |
| r++ + var<long>++; // no-warning |
| } |
| |
| } // namespace templates |