Mercurial > hg > CbC > CbC_gcc
view gcc/testsuite/g++.dg/cpp2a/constexpr-typeid2.C @ 145:1830386684a0
gcc-9.2.0
author | anatofuz |
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date | Thu, 13 Feb 2020 11:34:05 +0900 |
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// PR c++/88337 - Implement P1327R1: Allow dynamic_cast/typeid in constexpr. // { dg-do compile { target c++2a } } // Test polymorphic type. #include <typeinfo> struct B { virtual void foo (); const std::type_info &ti_base = typeid (*this); }; struct D : B { const std::type_info &ti = typeid (*this); }; constexpr B b; constexpr D d; static_assert (&b.ti_base == &typeid (B)); static_assert (&B{}.ti_base == &typeid (B)); static_assert (&B().ti_base == &typeid (B)); static_assert (&typeid ((B())) == &typeid (B)); static_assert (&typeid ((B{})) == &typeid (B)); static_assert (&d.ti == &typeid (D)); static_assert (&D{}.ti == &typeid (D)); static_assert (&D().ti == &typeid (D)); static_assert (&typeid ((D())) == &typeid (D)); static_assert (&typeid ((D{})) == &typeid (D)); extern D ed; // ??? Should this succeed? static_assert (&typeid (ed) == &typeid (D)); constexpr const B &r = d; static_assert (&typeid (r) == &typeid (D)); constexpr bool test () { // If expression is a glvalue expression that identifies an object // of a polymorphic type, the typeid expression evaluates the expression. bool ok = true; // Not a glvalue. (void) typeid (ok = false, D()); (void) typeid (ok = false, B()); if (!ok) return false; // Polymorphic glvalue -- this needs to be evaluated. ok = false; (void) typeid (ok = true, b); if (!ok) return false; ok = false; (void) typeid (ok = true, d); return ok; } static_assert (test ());