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 11 // <string_view> 12 13 // constexpr const _CharT& back(); 14 15 #include <string_view> 16 #include <cassert> 17 18 #include "test_macros.h" 19 20 template <typename CharT> 21 bool test ( const CharT *s, size_t len ) { 22 std::basic_string_view<CharT> sv ( s, len ); 23 assert ( sv.length() == len ); 24 assert ( sv.front() == s[0] ); 25 return &sv.front() == s; 26 } 27 28 int main () { 29 assert ( test ( "ABCDE", 5 )); 30 assert ( test ( "a", 1 )); 31 32 assert ( test ( L"ABCDE", 5 )); 33 assert ( test ( L"a", 1 )); 34 35 #if TEST_STD_VER >= 11 36 assert ( test ( u"ABCDE", 5 )); 37 assert ( test ( u"a", 1 )); 38 39 assert ( test ( U"ABCDE", 5 )); 40 assert ( test ( U"a", 1 )); 41 #endif 42 43 #if TEST_STD_VER >= 11 44 { 45 constexpr std::basic_string_view<char> sv ( "ABC", 2 ); 46 static_assert ( sv.length() == 2, "" ); 47 static_assert ( sv.front() == 'A', "" ); 48 } 49 #endif 50 } 51
