1 //===----------------------------------------------------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is dual licensed under the MIT and the University of Illinois Open 6 // Source Licenses. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 // UNSUPPORTED: c++98, c++03, c++11, c++14 11 12 // <memory> 13 14 // template <class _Tp> 15 // void destroy_at(_Tp*); 16 17 #include <memory> 18 #include <cstdlib> 19 #include <cassert> 20 21 struct Counted { 22 static int count; 23 static void reset() { count = 0; } 24 Counted() { ++count; } 25 Counted(Counted const&) { ++count; } 26 ~Counted() { --count; } 27 friend void operator&(Counted) = delete; 28 }; 29 int Counted::count = 0; 30 31 struct VCounted { 32 static int count; 33 static void reset() { count = 0; } 34 VCounted() { ++count; } 35 VCounted(VCounted const&) { ++count; } 36 virtual ~VCounted() { --count; } 37 friend void operator&(VCounted) = delete; 38 }; 39 int VCounted::count = 0; 40 41 struct DCounted : VCounted { 42 friend void operator&(DCounted) = delete; 43 }; 44 45 int main() 46 { 47 { 48 void* mem1 = std::malloc(sizeof(Counted)); 49 void* mem2 = std::malloc(sizeof(Counted)); 50 assert(mem1 && mem2); 51 assert(Counted::count == 0); 52 Counted* ptr1 = ::new(mem1) Counted(); 53 Counted* ptr2 = ::new(mem2) Counted(); 54 assert(Counted::count == 2); 55 std::destroy_at(ptr1); 56 assert(Counted::count == 1); 57 std::destroy_at(ptr2); 58 assert(Counted::count == 0); 59 std::free(mem1); 60 std::free(mem2); 61 } 62 { 63 void* mem1 = std::malloc(sizeof(DCounted)); 64 void* mem2 = std::malloc(sizeof(DCounted)); 65 assert(mem1 && mem2); 66 assert(DCounted::count == 0); 67 DCounted* ptr1 = ::new(mem1) DCounted(); 68 DCounted* ptr2 = ::new(mem2) DCounted(); 69 assert(DCounted::count == 2); 70 assert(VCounted::count == 2); 71 std::destroy_at(ptr1); 72 assert(VCounted::count == 1); 73 std::destroy_at(ptr2); 74 assert(VCounted::count == 0); 75 std::free(mem1); 76 std::free(mem2); 77 } 78 } 79
