libcxx/test/std/containers/sequences/deque/deque.modifiers/emplace_front.pass.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 // UNSUPPORTED: c++03
  10
  11 // <deque>
  12
  13 // template <class... Args> reference emplace_front(Args&&... args);
  14 // return type is 'reference' in C++17; 'void' before
  15
  16 #include <deque>
  17 #include <cstddef>
  18 #include <cassert>
  19
  20 #include "test_macros.h"
  21 #include "../../../Emplaceable.h"
  22 #include "min_allocator.h"
  23 #include "test_allocator.h"
  24
  25 template <class C>
  26 C
  27 make(int size, int start = 0 )
  28 {
  29     const int b = 4096 / sizeof(int);
  30     int init = 0;
  31     if (start > 0)
  32     {
  33         init = (start+1) / b + ((start+1) % b != 0);
  34         init *= b;
  35         --init;
  36     }
  37     C c(init);
  38     for (int i = 0; i < init-start; ++i)
  39         c.pop_back();
  40     for (int i = 0; i < size; ++i)
  41         c.push_back(Emplaceable());
  42     for (int i = 0; i < start; ++i)
  43         c.pop_front();
  44     return c;
  45 }
  46
  47 template <class C>
  48 void
  49 test(C& c1)
  50 {
  51     typedef typename C::iterator I;
  52     std::size_t c1_osize = c1.size();
  53 #if TEST_STD_VER > 14
  54     typedef typename C::reference Ref;
  55     Ref res_ref = c1.emplace_front(Emplaceable(1, 2.5));
  56 #else
  57                   c1.emplace_front(Emplaceable(1, 2.5));
  58 #endif
  59     assert(c1.size() == c1_osize + 1);
  60     assert(distance(c1.begin(), c1.end())
  61                == static_cast<std::ptrdiff_t>(c1.size()));
  62     I i = c1.begin();
  63     assert(*i == Emplaceable(1, 2.5));
  64 #if TEST_STD_VER > 14
  65     assert(&res_ref == &(*i));
  66 #endif
  67 }
  68
  69 template <class C>
  70 void
  71 testN(int start, int N)
  72 {
  73     C c1 = make<C>(N, start);
  74     test(c1);
  75 }
  76
  77
  78 int main(int, char**)
  79 {
  80     {
  81     int rng[] = {0, 1, 2, 3, 1023, 1024, 1025, 2047, 2048, 2049};
  82     const int N = sizeof(rng)/sizeof(rng[0]);
  83     for (int i = 0; i < N; ++i)
  84         for (int j = 0; j < N; ++j)
  85             testN<std::deque<Emplaceable> >(rng[i], rng[j]);
  86     }
  87     {
  88     int rng[] = {0, 1, 2, 3, 1023, 1024, 1025, 2047, 2048, 2049};
  89     const int N = sizeof(rng)/sizeof(rng[0]);
  90     for (int i = 0; i < N; ++i)
  91         for (int j = 0; j < N; ++j)
  92             testN<std::deque<Emplaceable, min_allocator<Emplaceable>> >(rng[i], rng[j]);
  93     }
  94     {
  95         std::deque<Tag_X, TaggingAllocator<Tag_X>> c;
  96         c.emplace_front();
  97         assert(c.size() == 1);
  98         c.emplace_front(1, 2, 3);
  99         assert(c.size() == 2);
 100         c.emplace_front();
 101         assert(c.size() == 3);
 102         c.emplace_front(1, 2, 3);
 103         assert(c.size() == 4);
 104     }
 105
 106   return 0;
 107 }