1 // RUN: %clang_cc1 -std=c++11 -verify %s 2 3 struct A { AA4 constexpr A(const int&) : rval(false) {} AA5 constexpr A(const int&&) : rval(true) {} 6 bool rval; 7 }; 8 struct B : A { 9 using A::A; 10 }; 11 12 constexpr int k = 0; 13 constexpr A a0{0}; 14 constexpr A a1{k}; 15 constexpr B b0{0}; 16 // This performs static_cast<(const int&)&&>(k), so calls the A(const int&) 17 // constructor. 18 constexpr B b1{k}; 19 20 static_assert(a0.rval && !a1.rval && b0.rval && !b1.rval, ""); 21 22 struct C { CC23 template<typename T> constexpr C(T t) : v(t) {} 24 int v; 25 }; 26 struct D : C { 27 using C::C; 28 }; 29 static_assert(D(123).v == 123, ""); 30 31 // FIXME: This diagnostic sucks. D(T t)32template<typename T> constexpr D::D(T t) : C(t) {} // expected-error {{definition of implicitly declared function}} 33