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// <string>
11
12// template<> struct char_traits<char16_t>
13
14// static int compare(const char_type* s1, const char_type* s2, size_t n);
15
16#include <string>
17#include <cassert>
18
19int main()
20{
21#ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
22#if __cplusplus >= 201103L
23    assert(std::char_traits<char16_t>::compare(u"", u"", 0) == 0);
24    assert(std::char_traits<char16_t>::compare(NULL, NULL, 0) == 0);
25
26    assert(std::char_traits<char16_t>::compare(u"1", u"1", 1) == 0);
27    assert(std::char_traits<char16_t>::compare(u"1", u"2", 1) < 0);
28    assert(std::char_traits<char16_t>::compare(u"2", u"1", 1) > 0);
29
30    assert(std::char_traits<char16_t>::compare(u"12", u"12", 2) == 0);
31    assert(std::char_traits<char16_t>::compare(u"12", u"13", 2) < 0);
32    assert(std::char_traits<char16_t>::compare(u"12", u"22", 2) < 0);
33    assert(std::char_traits<char16_t>::compare(u"13", u"12", 2) > 0);
34    assert(std::char_traits<char16_t>::compare(u"22", u"12", 2) > 0);
35
36    assert(std::char_traits<char16_t>::compare(u"123", u"123", 3) == 0);
37    assert(std::char_traits<char16_t>::compare(u"123", u"223", 3) < 0);
38    assert(std::char_traits<char16_t>::compare(u"123", u"133", 3) < 0);
39    assert(std::char_traits<char16_t>::compare(u"123", u"124", 3) < 0);
40    assert(std::char_traits<char16_t>::compare(u"223", u"123", 3) > 0);
41    assert(std::char_traits<char16_t>::compare(u"133", u"123", 3) > 0);
42    assert(std::char_traits<char16_t>::compare(u"124", u"123", 3) > 0);
43#endif
44#endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
45}
46