forked from OSchip/llvm-project
108 lines
3.2 KiB
C++
108 lines
3.2 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 <experimental/string_view>
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#include <cassert>
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template<typename CharT>
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void test1 ( std::experimental::basic_string_view<CharT> sv, size_t n, size_t pos ) {
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try {
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std::experimental::basic_string_view<CharT> sv1 = sv.substr(pos, n);
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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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catch ( const std::out_of_range & ) { assert ( pos > sv.size()); }
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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::experimental::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 __cplusplus >= 201103L
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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 _LIBCPP_STD_VER > 11
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{
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constexpr std::experimental::string_view sv1 { "ABCDE", 5 };
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{
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constexpr std::experimental::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::experimental::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::experimental::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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