1 // PR c++/51312 2 // { dg-do compile { target c++11 } } 3 4 struct X0 5 { 6 constexpr operator int() const { return 1; } 7 }; 8 9 struct X1 10 { 11 enum RE1 { re1 = 1 }; RE1X112 constexpr operator RE1() const { return re1; } 13 }; 14 15 struct X2 16 { 17 constexpr operator int() const { return __INT_MAX__; } 18 }; 19 20 struct X3 21 { 22 enum RE3 { re3 = __INT_MAX__ }; RE3X323 constexpr operator RE3() const { return re3; } 24 }; 25 26 struct X4 27 { 28 constexpr operator double() const { return 1.0; } 29 }; 30 31 struct X5 32 { 33 constexpr operator int() const { return __INT_MAX__; } 34 constexpr operator unsigned() const { return __INT_MAX__ * 2U + 1; } 35 }; 36 37 enum E0 { e0 = X0() }; 38 enum E1 { e1 = X1() }; 39 enum E2 { e2 = X2() }; 40 enum E3 { e3 = X3() }; 41 enum E4 { e4 = X4() }; // { dg-error "16:enumerator value for .e4. must have integral" } 42 enum E5 { e5 = X5() }; // { dg-error "ambiguous" } 43 44 enum F0 : int { f0 = X0() }; 45 enum F1 : int { f1 = X1() }; 46 enum F2 : int { f2 = X2() }; 47 enum F3 : int { f3 = X3() }; 48 enum F4 : int { f4 = X4() }; // { dg-error "narrowing" } 49 enum F5 : int { f5 = X5() }; 50 51 enum G0 : signed char { g0 = X0() }; 52 enum G1 : signed char { g1 = X1() }; 53 enum G2 : signed char { g2 = X2() }; // { dg-error "narrowing" } 54 enum G3 : signed char { g3 = X3() }; // { dg-error "narrowing" } 55 enum G4 : signed char { g4 = X4() }; // { dg-error "narrowing" } 56 enum G5 : signed char { g5 = X5() }; // { dg-error "ambiguous" } 57