libcxx/test/std/strings/basic.string/string.cons/alloc.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 // <string>
  10
  11 // explicit basic_string(const Allocator& a = Allocator()); // constexpr since C++20
  12
  13 #include <string>
  14 #include <cassert>
  15
  16 #include "test_macros.h"
  17 #include "test_allocator.h"
  18 #include "min_allocator.h"
  19 #include "asan_testing.h"
  20
  21 template <class S>
  22 TEST_CONSTEXPR_CXX20 void test() {
  23   {
  24 #if TEST_STD_VER > 14
  25     static_assert((noexcept(S{})), "");
  26 #elif TEST_STD_VER >= 11
  27     static_assert((noexcept(S()) == noexcept(typename S::allocator_type())), "");
  28 #endif
  29     S s;
  30     LIBCPP_ASSERT(s.__invariants());
  31     assert(s.data());
  32     assert(s.size() == 0);
  33     assert(s.capacity() >= s.size());
  34     assert(s.get_allocator() == typename S::allocator_type());
  35     LIBCPP_ASSERT(is_string_asan_correct(s));
  36   }
  37   {
  38 #if TEST_STD_VER > 14
  39     static_assert((noexcept(S{typename S::allocator_type{}})), "");
  40 #elif TEST_STD_VER >= 11
  41     static_assert((noexcept(S(typename S::allocator_type())) ==
  42                    std::is_nothrow_copy_constructible<typename S::allocator_type>::value),
  43                   "");
  44 #endif
  45     S s(typename S::allocator_type(5));
  46     LIBCPP_ASSERT(s.__invariants());
  47     assert(s.data());
  48     assert(s.size() == 0);
  49     assert(s.capacity() >= s.size());
  50     assert(s.get_allocator() == typename S::allocator_type(5));
  51     LIBCPP_ASSERT(is_string_asan_correct(s));
  52   }
  53 }
  54
  55 #if TEST_STD_VER >= 11
  56
  57 template <class S>
  58 TEST_CONSTEXPR_CXX20 void test2() {
  59   {
  60 #  if TEST_STD_VER > 14
  61     static_assert((noexcept(S{})), "");
  62 #  elif TEST_STD_VER >= 11
  63     static_assert((noexcept(S()) == noexcept(typename S::allocator_type())), "");
  64 #  endif
  65     S s;
  66     LIBCPP_ASSERT(s.__invariants());
  67     assert(s.data());
  68     assert(s.size() == 0);
  69     assert(s.capacity() >= s.size());
  70     assert(s.get_allocator() == typename S::allocator_type());
  71     LIBCPP_ASSERT(is_string_asan_correct(s));
  72   }
  73   {
  74 #  if TEST_STD_VER > 14
  75     static_assert((noexcept(S{typename S::allocator_type{}})), "");
  76 #  elif TEST_STD_VER >= 11
  77     static_assert((noexcept(S(typename S::allocator_type())) ==
  78                    std::is_nothrow_copy_constructible<typename S::allocator_type>::value),
  79                   "");
  80 #  endif
  81     S s(typename S::allocator_type{});
  82     LIBCPP_ASSERT(s.__invariants());
  83     assert(s.data());
  84     assert(s.size() == 0);
  85     assert(s.capacity() >= s.size());
  86     assert(s.get_allocator() == typename S::allocator_type());
  87     LIBCPP_ASSERT(is_string_asan_correct(s));
  88   }
  89 }
  90
  91 #endif
  92
  93 TEST_CONSTEXPR_CXX20 bool test() {
  94   test<std::basic_string<char, std::char_traits<char>, test_allocator<char> > >();
  95 #if TEST_STD_VER >= 11
  96   test2<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
  97   test2<std::basic_string<char, std::char_traits<char>, safe_allocator<char> > >();
  98   test2<std::basic_string<char, std::char_traits<char>, explicit_allocator<char> > >();
  99 #endif
 100
 101   return true;
 102 }
 103
 104 int main(int, char**) {
 105   test();
 106 #if TEST_STD_VER > 17
 107   static_assert(test());
 108 #endif
 109
 110   return 0;
 111 }