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      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 // <vector>
     11 
     12 // template <class... Args> void emplace_back(Args&&... args);
     13 
     14 #include <vector>
     15 #include <cassert>
     16 #include "../../../stack_allocator.h"
     17 #include "../../../min_allocator.h"
     18 
     19 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
     20 
     21 class A
     22 {
     23     int i_;
     24     double d_;
     25 
     26     A(const A&);
     27     A& operator=(const A&);
     28 public:
     29     A(int i, double d)
     30         : i_(i), d_(d) {}
     31 
     32     A(A&& a)
     33         : i_(a.i_),
     34           d_(a.d_)
     35     {
     36         a.i_ = 0;
     37         a.d_ = 0;
     38     }
     39 
     40     A& operator=(A&& a)
     41     {
     42         i_ = a.i_;
     43         d_ = a.d_;
     44         a.i_ = 0;
     45         a.d_ = 0;
     46         return *this;
     47     }
     48 
     49     int geti() const {return i_;}
     50     double getd() const {return d_;}
     51 };
     52 
     53 #endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
     54 
     55 int main()
     56 {
     57 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
     58     {
     59         std::vector<A> c;
     60         c.emplace_back(2, 3.5);
     61         assert(c.size() == 1);
     62         assert(c.front().geti() == 2);
     63         assert(c.front().getd() == 3.5);
     64         c.emplace_back(3, 4.5);
     65         assert(c.size() == 2);
     66         assert(c.front().geti() == 2);
     67         assert(c.front().getd() == 3.5);
     68         assert(c.back().geti() == 3);
     69         assert(c.back().getd() == 4.5);
     70     }
     71     {
     72         std::vector<A, stack_allocator<A, 4> > c;
     73         c.emplace_back(2, 3.5);
     74         assert(c.size() == 1);
     75         assert(c.front().geti() == 2);
     76         assert(c.front().getd() == 3.5);
     77         c.emplace_back(3, 4.5);
     78         assert(c.size() == 2);
     79         assert(c.front().geti() == 2);
     80         assert(c.front().getd() == 3.5);
     81         assert(c.back().geti() == 3);
     82         assert(c.back().getd() == 4.5);
     83     }
     84 #if __cplusplus >= 201103L
     85     {
     86         std::vector<A, min_allocator<A>> c;
     87         c.emplace_back(2, 3.5);
     88         assert(c.size() == 1);
     89         assert(c.front().geti() == 2);
     90         assert(c.front().getd() == 3.5);
     91         c.emplace_back(3, 4.5);
     92         assert(c.size() == 2);
     93         assert(c.front().geti() == 2);
     94         assert(c.front().getd() == 3.5);
     95         assert(c.back().geti() == 3);
     96         assert(c.back().getd() == 4.5);
     97     }
     98 #endif
     99 #endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
    100 }
    101