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
125 lines
3.4 KiB
C++
125 lines
3.4 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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// constexpr basic_string_view substr(size_type pos = 0, size_type n = npos) const;
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// Throws: out_of_range if pos > size().
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// Effects: Determines the effective length rlen of the string to reference as the smaller of n and size() - pos.
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// Returns: basic_string_view(data()+pos, rlen).
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#include <string_view>
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#include <algorithm>
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#include <stdexcept>
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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 test1(std::basic_string_view<CharT> sv, size_t n, size_t pos) {
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std::basic_string_view<CharT> sv1;
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#ifdef TEST_HAS_NO_EXCEPTIONS
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if (pos > sv.size())
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return ; // would throw if exceptions were enabled
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sv1 = sv.substr(pos, n);
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#else
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try {
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sv1 = sv.substr(pos, n);
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assert(pos <= sv.size());
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}
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catch (const std::out_of_range&) {
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assert(pos > sv.size());
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return ;
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}
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#endif
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const size_t rlen = std::min(n, sv.size() - pos);
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assert (sv1.size() == rlen);
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for (size_t i = 0; i < rlen; ++i)
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assert(sv[pos+i] == sv1[i]);
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}
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template<typename CharT>
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void test ( const CharT *s ) {
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typedef std::basic_string_view<CharT> string_view_t;
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string_view_t sv1 ( s );
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test1(sv1, 0, 0);
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test1(sv1, 1, 0);
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test1(sv1, 20, 0);
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test1(sv1, sv1.size(), 0);
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test1(sv1, 0, 3);
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test1(sv1, 2, 3);
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test1(sv1, 100, 3);
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test1(sv1, 0, string_view_t::npos);
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test1(sv1, 2, string_view_t::npos);
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test1(sv1, sv1.size(), string_view_t::npos);
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test1(sv1, sv1.size() + 1, 0);
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test1(sv1, sv1.size() + 1, 1);
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test1(sv1, sv1.size() + 1, string_view_t::npos);
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}
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int main(int, char**) {
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test ( "ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE" );
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test ( "ABCDE");
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test ( "a" );
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test ( "" );
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test ( L"ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE" );
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test ( L"ABCDE" );
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test ( L"a" );
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test ( L"" );
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#if TEST_STD_VER >= 11
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test ( u"ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE" );
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test ( u"ABCDE" );
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test ( u"a" );
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test ( u"" );
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test ( U"ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE" );
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test ( U"ABCDE" );
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test ( U"a" );
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test ( U"" );
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#endif
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#if TEST_STD_VER > 11
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{
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constexpr std::string_view sv1 { "ABCDE", 5 };
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{
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constexpr std::string_view sv2 = sv1.substr ( 0, 3 );
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static_assert ( sv2.size() == 3, "" );
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static_assert ( sv2[0] == 'A', "" );
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static_assert ( sv2[1] == 'B', "" );
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static_assert ( sv2[2] == 'C', "" );
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}
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{
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constexpr std::string_view sv2 = sv1.substr ( 3, 0 );
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static_assert ( sv2.size() == 0, "" );
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}
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{
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constexpr std::string_view sv2 = sv1.substr ( 3, 3 );
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static_assert ( sv2.size() == 2, "" );
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static_assert ( sv2[0] == 'D', "" );
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static_assert ( sv2[1] == 'E', "" );
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}
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}
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#endif
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return 0;
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}
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