4fc502368a
`string_view` is supported all the way back to C++03 as an extension in `libc++`, and so many of the tests run in all standards modes for all vendors. This is unlikely desired by other standard library vendors using our test suite. So, disable the tests for vendors other than `libc++` in these older standards modes. Differential Revision: https://reviews.llvm.org/D126850
82 lines
1.8 KiB
C++
82 lines
1.8 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: !stdlib=libc++ && (c++03 || c++11 || c++14)
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// <string_view>
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// void remove_prefix(size_type _n)
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#include <string_view>
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#include <cassert>
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#include "test_macros.h"
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template<typename CharT>
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void test ( const CharT *s, size_t len ) {
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typedef std::basic_string_view<CharT> SV;
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{
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SV sv1 ( s );
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assert ( sv1.size() == len );
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assert ( sv1.data() == s );
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if ( len > 0 ) {
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sv1.remove_prefix ( 1 );
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assert ( sv1.size() == (len - 1));
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assert ( sv1.data() == (s + 1));
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sv1.remove_prefix ( len - 1 );
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}
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assert ( sv1.size() == 0 );
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sv1.remove_prefix ( 0 );
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assert ( sv1.size() == 0 );
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}
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}
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#if TEST_STD_VER > 11
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constexpr size_t test_ce ( size_t n, size_t k ) {
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typedef std::basic_string_view<char> SV;
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SV sv1{ "ABCDEFGHIJKL", n };
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sv1.remove_prefix ( k );
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return sv1.size();
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}
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#endif
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int main(int, char**) {
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test ( "ABCDE", 5 );
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test ( "a", 1 );
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test ( "", 0 );
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#ifndef TEST_HAS_NO_WIDE_CHARACTERS
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test ( L"ABCDE", 5 );
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test ( L"a", 1 );
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test ( L"", 0 );
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#endif
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#if TEST_STD_VER >= 11
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test ( u"ABCDE", 5 );
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test ( u"a", 1 );
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test ( u"", 0 );
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test ( U"ABCDE", 5 );
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test ( U"a", 1 );
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test ( U"", 0 );
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#endif
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#if TEST_STD_VER > 11
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{
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static_assert ( test_ce ( 5, 0 ) == 5, "" );
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static_assert ( test_ce ( 5, 1 ) == 4, "" );
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static_assert ( test_ce ( 5, 5 ) == 0, "" );
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static_assert ( test_ce ( 9, 3 ) == 6, "" );
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}
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#endif
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return 0;
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}
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