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 11 12 // <list> 13 14 // template <class... Args> reference emplace_front(Args&&... args); 15 // return type is 'reference' in C++17; 'void' before 16 17 #include <list> 18 #include <cassert> 19 20 #include "min_allocator.h" 21 22 class A 23 { 24 int i_; 25 double d_; 26 27 A(const A&); 28 A& operator=(const A&); 29 public: 30 A(int i, double d) 31 : i_(i), d_(d) {} 32 33 int geti() const {return i_;} 34 double getd() const {return d_;} 35 }; 36 37 int main() 38 { 39 { 40 std::list<A> c; 41 #if TEST_STD_VER > 14 42 A& r1 = c.emplace_front(2, 3.5); 43 assert(c.size() == 1); 44 assert(&r1 == &c.front()); 45 assert(c.front().geti() == 2); 46 assert(c.front().getd() == 3.5); 47 A& r2 = c.emplace_front(3, 4.5); 48 assert(c.size() == 2); 49 assert(&r2 == &c.front()); 50 #else 51 c.emplace_front(2, 3.5); 52 assert(c.size() == 1); 53 assert(c.front().geti() == 2); 54 assert(c.front().getd() == 3.5); 55 c.emplace_front(3, 4.5); 56 assert(c.size() == 2); 57 #endif 58 assert(c.front().geti() == 3); 59 assert(c.front().getd() == 4.5); 60 assert(c.back().geti() == 2); 61 assert(c.back().getd() == 3.5); 62 } 63 64 { 65 std::list<A, min_allocator<A>> c; 66 #if TEST_STD_VER > 14 67 A& r1 = c.emplace_front(2, 3.5); 68 assert(c.size() == 1); 69 assert(&r1 == &c.front()); 70 assert(c.front().geti() == 2); 71 assert(c.front().getd() == 3.5); 72 A& r2 = c.emplace_front(3, 4.5); 73 assert(c.size() == 2); 74 assert(&r2 == &c.front()); 75 #else 76 c.emplace_front(2, 3.5); 77 assert(c.size() == 1); 78 assert(c.front().geti() == 2); 79 assert(c.front().getd() == 3.5); 80 c.emplace_front(3, 4.5); 81 assert(c.size() == 2); 82 #endif 83 assert(c.front().geti() == 3); 84 assert(c.front().getd() == 4.5); 85 assert(c.back().geti() == 2); 86 assert(c.back().getd() == 3.5); 87 } 88 } 89
