rbegin.pass.cpp (2817B)
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_view> 11 12 // const_iterator rbegin() const; 13 14 #include <string_view> 15 #include <cassert> 16 17 #include "test_macros.h" 18 19 template <class S> 20 void 21 test(S s) 22 { 23 const S& cs = s; 24 typename S::reverse_iterator b = s.rbegin(); 25 typename S::const_reverse_iterator cb1 = cs.rbegin(); 26 typename S::const_reverse_iterator cb2 = s.crbegin(); 27 if (!s.empty()) 28 { 29 const size_t last = s.size() - 1; 30 assert( *b == s[last]); 31 assert( &*b == &s[last]); 32 assert( *cb1 == s[last]); 33 assert(&*cb1 == &s[last]); 34 assert( *cb2 == s[last]); 35 assert(&*cb2 == &s[last]); 36 37 } 38 assert( b == cb1); 39 assert( b == cb2); 40 assert(cb1 == cb2); 41 } 42 43 44 int main() 45 { 46 typedef std::string_view string_view; 47 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L 48 typedef std::u8string_view u8string_view; 49 #endif 50 typedef std::u16string_view u16string_view; 51 typedef std::u32string_view u32string_view; 52 typedef std::wstring_view wstring_view; 53 54 test(string_view ()); 55 test(u16string_view()); 56 test(u32string_view()); 57 test(wstring_view ()); 58 test(string_view ( "123")); 59 test(wstring_view (L"123")); 60 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L 61 test(u8string_view{u8"123"}); 62 #endif 63 #if TEST_STD_VER >= 11 64 test(u16string_view{u"123"}); 65 test(u32string_view{U"123"}); 66 #endif 67 68 #if TEST_STD_VER > 14 69 { 70 constexpr string_view sv { "123", 3 }; 71 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L 72 constexpr u8string_view u8sv {u8"123", 3 }; 73 #endif 74 constexpr u16string_view u16sv {u"123", 3 }; 75 constexpr u32string_view u32sv {U"123", 3 }; 76 constexpr wstring_view wsv {L"123", 3 }; 77 78 static_assert ( *sv.rbegin() == sv[2], "" ); 79 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L 80 static_assert ( *u8sv.rbegin() == u8sv[2], "" ); 81 #endif 82 static_assert ( *u16sv.rbegin() == u16sv[2], "" ); 83 static_assert ( *u32sv.rbegin() == u32sv[2], "" ); 84 static_assert ( *wsv.rbegin() == wsv[2], "" ); 85 86 static_assert ( *sv.crbegin() == sv[2], "" ); 87 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L 88 static_assert ( *u8sv.crbegin() == u8sv[2], "" ); 89 #endif 90 static_assert ( *u16sv.crbegin() == u16sv[2], "" ); 91 static_assert ( *u32sv.crbegin() == u32sv[2], "" ); 92 static_assert ( *wsv.crbegin() == wsv[2], "" ); 93 } 94 #endif 95 }