Mercurial > hg > CbC > CbC_gcc
view gcc/testsuite/g++.dg/torture/pr91606.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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/* { dg-do run } */ /* { dg-additional-options "-fstrict-aliasing" } */ #include <cstdlib> #include <array> #include <type_traits> template <typename T1, typename T2> struct variant { constexpr variant(T1 arg) : f1(arg), index(0) {} constexpr variant(T2 arg) : f2(arg), index(1) {} union { T1 f1; T2 f2; }; std::size_t index = 0; }; template <typename T1, typename T2> constexpr const T1* get_if(const variant<T1, T2>* v) { if (v->index != 0) { return nullptr; } return &v->f1; } template <typename T2, typename T1> constexpr const T2* get_if(const variant<T1, T2>* v) { if (v->index != 1) { return nullptr; } return &v->f2; } template <typename T, size_t N> struct my_array { constexpr const T* begin() const { return data; } constexpr const T* end() const { return data + N; } T data[N]; }; template <typename ...Ts> constexpr auto get_array_of_variants(Ts ...ptrs) { return std::array<variant<std::decay_t<Ts>...>, sizeof...(Ts)>{ ptrs... }; } template <typename T> constexpr auto get_member_functions(); template <typename Member, typename Class> constexpr int getFuncId(Member (Class::*memFuncPtr)) { int idx = 0u; for (auto &anyFunc : get_member_functions<Class>()) { if (auto *specificFunc = get_if<Member (Class::*)>(&anyFunc)) { if (*specificFunc == memFuncPtr) { return idx; } } ++idx; } std::abort(); } struct MyStruct { void fun1(int /*a*/) {} int fun2(char /*b*/, short /*c*/, bool /*d*/) { return 0; } }; template <> constexpr auto get_member_functions<MyStruct>() { return get_array_of_variants(&MyStruct::fun1, &MyStruct::fun2); } int main() { return getFuncId(&MyStruct::fun1); }