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eae7e51a7d
test/std/strings/string.view/string.view.ops/compare.pointer_size.pass.cpp Passing -1 to size_t triggers signed/unsigned mismatch warnings because it's a value-modifying conversion. Add static_cast<size_t> to soothe the compiler. (This file refers to size_t unqualified.) test/std/strings/string.view/string.view.ops/substr.pass.cpp Add <algorithm> for std::min() and <stdexcept> for std::out_of_range. N4618 21.4.2.4 [string.view.access]/1: "Requires: pos < size()." /4: "[ Note: Unlike basic_string::operator[], basic_string_view::operator[](size()) has undefined behavior instead of returning charT(). -end note ]" Fixes D27633. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@289283 91177308-0d34-0410-b5e6-96231b3b80d8
122 lines
3.3 KiB
C++
122 lines
3.3 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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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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