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 "asan_testing.h"
  17 #include <deque>
  18 #include <cstddef>
  19 #include <cassert>
  20
  21 #include "test_macros.h"
  22 #include "../../../Emplaceable.h"
  23 #include "min_allocator.h"
  24 #include "test_allocator.h"
  25
  26 template <class C>
  27 C
  28 make(int size, int start = 0 )
  29 {
  30     const int b = 4096 / sizeof(int);
  31     int init = 0;
  32     if (start > 0)
  33     {
  34         init = (start+1) / b + ((start+1) % b != 0);
  35         init *= b;
  36         --init;
  37     }
  38     C c(init);
  39     for (int i = 0; i < init-start; ++i)
  40         c.pop_back();
  41     for (int i = 0; i < size; ++i)
  42         c.push_back(Emplaceable());
  43     for (int i = 0; i < start; ++i)
  44         c.pop_front();
  45     return c;
  46 }
  47
  48 template <class C>
  49 void
  50 test(C& c1)
  51 {
  52     typedef typename C::iterator I;
  53     std::size_t c1_osize = c1.size();
  54 #if TEST_STD_VER > 14
  55     typedef typename C::reference Ref;
  56     Ref res_ref = c1.emplace_front(Emplaceable(1, 2.5));
  57 #else
  58                   c1.emplace_front(Emplaceable(1, 2.5));
  59 #endif
  60     assert(c1.size() == c1_osize + 1);
  61     assert(std::distance(c1.begin(), c1.end())
  62                == static_cast<std::ptrdiff_t>(c1.size()));
  63     I i = c1.begin();
  64     assert(*i == Emplaceable(1, 2.5));
  65     LIBCPP_ASSERT(is_double_ended_contiguous_container_asan_correct(c1));
  66 #if TEST_STD_VER > 14
  67     assert(&res_ref == &(*i));
  68 #endif
  69 }
  70
  71 template <class C>
  72 void
  73 testN(int start, int N)
  74 {
  75     C c1 = make<C>(N, start);
  76     test(c1);
  77 }
  78
  79
  80 int main(int, char**)
  81 {
  82     {
  83     int rng[] = {0, 1, 2, 3, 1023, 1024, 1025, 2047, 2048, 2049};
  84     const int N = sizeof(rng)/sizeof(rng[0]);
  85     for (int i = 0; i < N; ++i)
  86         for (int j = 0; j < N; ++j)
  87             testN<std::deque<Emplaceable> >(rng[i], rng[j]);
  88     }
  89     {
  90     int rng[] = {0, 1, 2, 3, 1023, 1024, 1025, 2047, 2048, 2049};
  91     const int N = sizeof(rng)/sizeof(rng[0]);
  92     for (int i = 0; i < N; ++i)
  93         for (int j = 0; j < N; ++j)
  94             testN<std::deque<Emplaceable, min_allocator<Emplaceable>> >(rng[i], rng[j]);
  95     }
  96     {
  97         std::deque<Tag_X, TaggingAllocator<Tag_X>> c;
  98         c.emplace_front();
  99         assert(c.size() == 1);
 100         LIBCPP_ASSERT(is_double_ended_contiguous_container_asan_correct(c));
 101         c.emplace_front(1, 2, 3);
 102         assert(c.size() == 2);
 103         LIBCPP_ASSERT(is_double_ended_contiguous_container_asan_correct(c));
 104         c.emplace_front();
 105         assert(c.size() == 3);
 106         LIBCPP_ASSERT(is_double_ended_contiguous_container_asan_correct(c));
 107         c.emplace_front(1, 2, 3);
 108         assert(c.size() == 4);
 109         LIBCPP_ASSERT(is_double_ended_contiguous_container_asan_correct(c));
 110     }
 111
 112   return 0;
 113 }