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      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<wchar_t>
     13 
     14 // static const char_type* find(const char_type* s, size_t n, const char_type& a);
     15 // constexpr in C++17
     16 
     17 #include <string>
     18 #include <cassert>
     19 
     20 #include "test_macros.h"
     21 
     22 #if TEST_STD_VER > 14
     23 constexpr bool test_constexpr()
     24 {
     25     constexpr const wchar_t *p = L"123";
     26     return std::char_traits<wchar_t>::find(p, 3, L'1') == p
     27         && std::char_traits<wchar_t>::find(p, 3, L'2') == p + 1
     28         && std::char_traits<wchar_t>::find(p, 3, L'3') == p + 2
     29         && std::char_traits<wchar_t>::find(p, 3, L'4') == nullptr;
     30 }
     31 #endif
     32 
     33 int main()
     34 {
     35     wchar_t s1[] = {1, 2, 3};
     36     assert(std::char_traits<wchar_t>::find(s1, 3, wchar_t(1)) == s1);
     37     assert(std::char_traits<wchar_t>::find(s1, 3, wchar_t(2)) == s1+1);
     38     assert(std::char_traits<wchar_t>::find(s1, 3, wchar_t(3)) == s1+2);
     39     assert(std::char_traits<wchar_t>::find(s1, 3, wchar_t(4)) == 0);
     40     assert(std::char_traits<wchar_t>::find(s1, 3, wchar_t(0)) == 0);
     41     assert(std::char_traits<wchar_t>::find(NULL, 0, wchar_t(0)) == 0);
     42 
     43 #if TEST_STD_VER > 14
     44     static_assert(test_constexpr(), "" );
     45 #endif
     46 }
     47