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 // void clear() noexcept 14 15 #include <string_view> 16 #include <cassert> 17 18 #include "test_macros.h" 19 20 template<typename CharT> 21 void test ( const CharT *s, size_t len ) { 22 typedef std::basic_string_view<CharT> SV; 23 { 24 SV sv1 ( s ); 25 assert ( sv1.size() == len ); 26 assert ( sv1.data() == s ); 27 28 sv1.clear (); 29 assert ( sv1.data() == nullptr ); 30 assert ( sv1.size() == 0 ); 31 assert ( sv1 == SV()); 32 } 33 } 34 35 #if TEST_STD_VER > 11 36 constexpr size_t test_ce ( size_t n ) { 37 typedef std::basic_string_view<char> SV; 38 SV sv1{ "ABCDEFGHIJKL", n }; 39 sv1.clear(); 40 return sv1.size(); 41 } 42 #endif 43 44 int main () { 45 test ( "ABCDE", 5 ); 46 test ( "a", 1 ); 47 test ( "", 0 ); 48 49 test ( L"ABCDE", 5 ); 50 test ( L"a", 1 ); 51 test ( L"", 0 ); 52 53 #if TEST_STD_VER >= 11 54 test ( u"ABCDE", 5 ); 55 test ( u"a", 1 ); 56 test ( u"", 0 ); 57 58 test ( U"ABCDE", 5 ); 59 test ( U"a", 1 ); 60 test ( U"", 0 ); 61 #endif 62 63 #if TEST_STD_VER > 11 64 static_assert ( test_ce (5) == 0, "" ); 65 #endif 66 67 } 68
