emplace_back.pass.cpp (2157B)
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_back(Args&&... args); 15 // return type is 'reference' in C++17; 'void' before 16 17 #include <list> 18 #include <cassert> 19 20 #include "test_macros.h" 21 #include "min_allocator.h" 22 23 class A 24 { 25 int i_; 26 double d_; 27 28 A(const A&); 29 A& operator=(const A&); 30 public: 31 A(int i, double d) 32 : i_(i), d_(d) {} 33 34 int geti() const {return i_;} 35 double getd() const {return d_;} 36 }; 37 38 int main() 39 { 40 { 41 std::list<A> c; 42 #if TEST_STD_VER > 14 43 A& r1 = c.emplace_back(2, 3.5); 44 assert(c.size() == 1); 45 assert(&r1 == &c.back()); 46 assert(c.front().geti() == 2); 47 assert(c.front().getd() == 3.5); 48 A& r2 = c.emplace_back(3, 4.5); 49 assert(c.size() == 2); 50 assert(&r2 == &c.back()); 51 #else 52 c.emplace_back(2, 3.5); 53 assert(c.size() == 1); 54 assert(c.front().geti() == 2); 55 assert(c.front().getd() == 3.5); 56 c.emplace_back(3, 4.5); 57 assert(c.size() == 2); 58 #endif 59 assert(c.front().geti() == 2); 60 assert(c.front().getd() == 3.5); 61 assert(c.back().geti() == 3); 62 assert(c.back().getd() == 4.5); 63 } 64 { 65 std::list<A, min_allocator<A>> c; 66 #if TEST_STD_VER > 14 67 A& r1 = c.emplace_back(2, 3.5); 68 assert(c.size() == 1); 69 assert(&r1 == &c.back()); 70 assert(c.front().geti() == 2); 71 assert(c.front().getd() == 3.5); 72 A& r2 = c.emplace_back(3, 4.5); 73 assert(c.size() == 2); 74 assert(&r2 == &c.back()); 75 #else 76 c.emplace_back(2, 3.5); 77 assert(c.size() == 1); 78 assert(c.front().geti() == 2); 79 assert(c.front().getd() == 3.5); 80 c.emplace_back(3, 4.5); 81 assert(c.size() == 2); 82 #endif 83 assert(c.front().geti() == 2); 84 assert(c.front().getd() == 3.5); 85 assert(c.back().geti() == 3); 86 assert(c.back().getd() == 4.5); 87 } 88 }