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& at(size_type _pos) const; 14 15 #include <experimental/string_view> 16 #include <cassert> 17 18 template <typename CharT> 19 void test ( const CharT *s, size_t len ) { 20 std::experimental::basic_string_view<CharT> sv ( s, len ); 21 assert ( sv.length() == len ); 22 for ( size_t i = 0; i < len; ++i ) { 23 assert ( sv.at(i) == s[i] ); 24 assert ( &sv.at(i) == s + i ); 25 } 26 27 try { sv.at(len); } catch ( const std::out_of_range & ) { return ; } 28 assert ( false ); 29 } 30 31 int main () { 32 test ( "ABCDE", 5 ); 33 test ( "a", 1 ); 34 35 test ( L"ABCDE", 5 ); 36 test ( L"a", 1 ); 37 38 #if __cplusplus >= 201103L 39 test ( u"ABCDE", 5 ); 40 test ( u"a", 1 ); 41 42 test ( U"ABCDE", 5 ); 43 test ( U"a", 1 ); 44 #endif 45 46 #if __cplusplus >= 201103L 47 { 48 constexpr std::experimental::basic_string_view<char> sv ( "ABC", 2 ); 49 static_assert ( sv.length() == 2, "" ); 50 static_assert ( sv.at(0) == 'A', "" ); 51 static_assert ( sv.at(1) == 'B', "" ); 52 } 53 #endif 54 } 55