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      1 //===----------------------------------------------------------------------===//
      2 //
      3 //                     The LLVM Compiler Infrastructure
      4 //
      5 // This file is dual licensed under the MIT and the University of Illinois Open
      6 // Source Licenses. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 
     10 
     11 // <string_view>
     12 
     13 // [string.view.capacity], capacity
     14 // constexpr size_type size()     const noexcept;
     15 // constexpr size_type length()   const noexcept;
     16 // constexpr size_type max_size() const noexcept;
     17 // constexpr bool empty()         const noexcept;
     18 
     19 #include <experimental/string_view>
     20 #include <cassert>
     21 
     22 template<typename SV>
     23 void test1 () {
     24 #if _LIBCPP_STD_VER > 11
     25     {
     26     constexpr SV sv1;
     27     static_assert ( sv1.size() == 0, "" );
     28     static_assert ( sv1.empty(), "");
     29     static_assert ( sv1.size() == sv1.length(), "" );
     30     static_assert ( sv1.max_size() > sv1.size(), "");
     31     }
     32 #endif
     33 
     34     {
     35     SV sv1;
     36     assert ( sv1.size() == 0 );
     37     assert ( sv1.empty());
     38     assert ( sv1.size() == sv1.length());
     39     assert ( sv1.max_size() > sv1.size());
     40     }
     41 }
     42 
     43 template<typename CharT>
     44 void test2 ( const CharT *s, size_t len ) {
     45     {
     46     std::experimental::basic_string_view<CharT> sv1 ( s );
     47     assert ( sv1.size() == len );
     48     assert ( sv1.data() == s );
     49     assert ( sv1.empty() == (len == 0));
     50     assert ( sv1.size() == sv1.length());
     51     assert ( sv1.max_size() > sv1.size());
     52     }
     53 }
     54 
     55 int main () {
     56     typedef std::experimental::string_view    string_view;
     57     typedef std::experimental::u16string_view u16string_view;
     58     typedef std::experimental::u32string_view u32string_view;
     59     typedef std::experimental::wstring_view   wstring_view;
     60 
     61     test1<string_view> ();
     62     test1<u16string_view> ();
     63     test1<u32string_view> ();
     64     test1<wstring_view> ();
     65 
     66     test2 ( "ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE", 105 );
     67     test2 ( "ABCDE", 5 );
     68     test2 ( "a", 1 );
     69     test2 ( "", 0 );
     70 
     71     test2 ( L"ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE", 105 );
     72     test2 ( L"ABCDE", 5 );
     73     test2 ( L"a", 1 );
     74     test2 ( L"", 0 );
     75 
     76 #if __cplusplus >= 201103L
     77     test2 ( u"ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE", 105 );
     78     test2 ( u"ABCDE", 5 );
     79     test2 ( u"a", 1 );
     80     test2 ( u"", 0 );
     81 
     82     test2 ( U"ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE", 105 );
     83     test2 ( U"ABCDE", 5 );
     84     test2 ( U"a", 1 );
     85     test2 ( U"", 0 );
     86 #endif
     87 }
     88