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 remove_prefix(size_type _n) 14 15 #include <experimental/string_view> 16 #include <cassert> 17 #include <iostream> 18 19 template<typename CharT> 20 void test ( const CharT *s, size_t len ) { 21 typedef std::experimental::basic_string_view<CharT> SV; 22 { 23 SV sv1 ( s ); 24 assert ( sv1.size() == len ); 25 assert ( sv1.data() == s ); 26 27 if ( len > 0 ) { 28 sv1.remove_prefix ( 1 ); 29 assert ( sv1.size() == (len - 1)); 30 assert ( sv1.data() == (s + 1)); 31 sv1.remove_prefix ( len - 1 ); 32 } 33 34 assert ( sv1.size() == 0 ); 35 sv1.remove_prefix ( 0 ); 36 assert ( sv1.size() == 0 ); 37 } 38 } 39 40 #if _LIBCPP_STD_VER > 11 41 constexpr size_t test_ce ( size_t n, size_t k ) { 42 typedef std::experimental::basic_string_view<char> SV; 43 SV sv1{ "ABCDEFGHIJKL", n }; 44 sv1.remove_prefix ( k ); 45 return sv1.size(); 46 } 47 #endif 48 49 int main () { 50 test ( "ABCDE", 5 ); 51 test ( "a", 1 ); 52 test ( "", 0 ); 53 54 test ( L"ABCDE", 5 ); 55 test ( L"a", 1 ); 56 test ( L"", 0 ); 57 58 #if __cplusplus >= 201103L 59 test ( u"ABCDE", 5 ); 60 test ( u"a", 1 ); 61 test ( u"", 0 ); 62 63 test ( U"ABCDE", 5 ); 64 test ( U"a", 1 ); 65 test ( U"", 0 ); 66 #endif 67 68 #if _LIBCPP_STD_VER > 11 69 { 70 static_assert ( test_ce ( 5, 0 ) == 5, "" ); 71 static_assert ( test_ce ( 5, 1 ) == 4, "" ); 72 static_assert ( test_ce ( 5, 5 ) == 0, "" ); 73 static_assert ( test_ce ( 9, 3 ) == 6, "" ); 74 } 75 #endif 76 } 77
