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// Test nested types and default template args:
12
13// template<class charT, class traits = char_traits<charT>,
14// class Allocator = allocator<charT> >
15// {
16// public:
17// // types:
18// typedef traits traits_type;
19// typedef typename traits::char_type value_type;
20// typedef Allocator allocator_type;
21// typedef typename Allocator::size_type size_type;
22// typedef typename Allocator::difference_type difference_type;
23// typedef typename Allocator::reference reference;
24// typedef typename Allocator::const_reference const_reference;
25// typedef typename Allocator::pointer pointer;
26// typedef typename Allocator::const_pointer const_pointer;
27// typedef implementation-defined iterator; // See 23.1
28// typedef implementation-defined const_iterator; // See 23.1
29// typedef std::reverse_iterator<iterator> reverse_iterator;
30// typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
31// static const size_type npos = -1;
32// };
33
34#include <string>
35#include <iterator>
36#include <type_traits>
37
38#include "test_macros.h"
39#include "test_traits.h"
40#include "test_allocator.h"
41#include "min_allocator.h"
42
43template <class Traits, class Allocator>
44void test() {
45 typedef std::basic_string<typename Traits::char_type, Traits, Allocator> S;
46
47 static_assert((std::is_same<typename S::traits_type, Traits>::value), "");
48 static_assert((std::is_same<typename S::value_type, typename Traits::char_type>::value), "");
49 static_assert((std::is_same<typename S::value_type, typename Allocator::value_type>::value), "");
50 static_assert((std::is_same<typename S::allocator_type, Allocator>::value), "");
51 static_assert((std::is_same<typename S::size_type, typename std::allocator_traits<Allocator>::size_type>::value), "");
52 static_assert(
53 (std::is_same<typename S::difference_type, typename std::allocator_traits<Allocator>::difference_type>::value),
54 "");
55 static_assert((std::is_same<typename S::reference, typename S::value_type&>::value), "");
56 static_assert((std::is_same<typename S::const_reference, const typename S::value_type&>::value), "");
57 static_assert((std::is_same<typename S::pointer, typename std::allocator_traits<Allocator>::pointer>::value), "");
58 static_assert(
59 (std::is_same<typename S::const_pointer, typename std::allocator_traits<Allocator>::const_pointer>::value), "");
60 static_assert((std::is_same< typename std::iterator_traits<typename S::iterator>::iterator_category,
61 std::random_access_iterator_tag>::value),
62 "");
63 static_assert((std::is_same< typename std::iterator_traits<typename S::const_iterator>::iterator_category,
64 std::random_access_iterator_tag>::value),
65 "");
66 static_assert((std::is_same< typename S::reverse_iterator, std::reverse_iterator<typename S::iterator> >::value), "");
67 static_assert(
68 (std::is_same< typename S::const_reverse_iterator, std::reverse_iterator<typename S::const_iterator> >::value),
69 "");
70 static_assert(S::npos == -1, "");
71}
72
73int main(int, char**) {
74 test<test_traits<char>, test_allocator<char> >();
75#ifndef TEST_HAS_NO_WIDE_CHARACTERS
76 test<std::char_traits<wchar_t>, std::allocator<wchar_t> >();
77#endif
78 static_assert((std::is_same<std::basic_string<char>::traits_type, std::char_traits<char> >::value), "");
79 static_assert((std::is_same<std::basic_string<char>::allocator_type, std::allocator<char> >::value), "");
80#if TEST_STD_VER >= 11
81 test<std::char_traits<char>, min_allocator<char> >();
82#endif
83
84 return 0;
85}
86

source code of libcxx/test/std/strings/basic.string/types.pass.cpp