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7c3769df62
to reflect the new license. These used slightly different spellings that defeated my regular expressions. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@351648 91177308-0d34-0410-b5e6-96231b3b80d8
121 lines
3.3 KiB
C++
121 lines
3.3 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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// <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 () {
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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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}
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