| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // UNSUPPORTED: !stdlib=libc++ && (c++03 || c++11 || c++14) |
| |
| // <string_view> |
| |
| // void remove_prefix(size_type _n) |
| |
| #include <string_view> |
| #include <cassert> |
| |
| #include "test_macros.h" |
| |
| template<typename CharT> |
| void test ( const CharT *s, size_t len ) { |
| typedef std::basic_string_view<CharT> SV; |
| { |
| SV sv1 ( s ); |
| assert ( sv1.size() == len ); |
| assert ( sv1.data() == s ); |
| |
| if ( len > 0 ) { |
| sv1.remove_prefix ( 1 ); |
| assert ( sv1.size() == (len - 1)); |
| assert ( sv1.data() == (s + 1)); |
| sv1.remove_prefix ( len - 1 ); |
| } |
| |
| assert ( sv1.size() == 0 ); |
| sv1.remove_prefix ( 0 ); |
| assert ( sv1.size() == 0 ); |
| } |
| } |
| |
| #if TEST_STD_VER > 11 |
| constexpr size_t test_ce ( size_t n, size_t k ) { |
| typedef std::basic_string_view<char> SV; |
| SV sv1{ "ABCDEFGHIJKL", n }; |
| sv1.remove_prefix ( k ); |
| return sv1.size(); |
| } |
| #endif |
| |
| int main(int, char**) { |
| test ( "ABCDE", 5 ); |
| test ( "a", 1 ); |
| test ( "", 0 ); |
| |
| #ifndef TEST_HAS_NO_WIDE_CHARACTERS |
| test ( L"ABCDE", 5 ); |
| test ( L"a", 1 ); |
| test ( L"", 0 ); |
| #endif |
| |
| #if TEST_STD_VER >= 11 |
| test ( u"ABCDE", 5 ); |
| test ( u"a", 1 ); |
| test ( u"", 0 ); |
| |
| test ( U"ABCDE", 5 ); |
| test ( U"a", 1 ); |
| test ( U"", 0 ); |
| #endif |
| |
| #if TEST_STD_VER > 11 |
| { |
| static_assert ( test_ce ( 5, 0 ) == 5, "" ); |
| static_assert ( test_ce ( 5, 1 ) == 4, "" ); |
| static_assert ( test_ce ( 5, 5 ) == 0, "" ); |
| static_assert ( test_ce ( 9, 3 ) == 6, "" ); |
| } |
| #endif |
| |
| return 0; |
| } |