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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 // <string_view>
     11 
     12 // size_type copy(charT* s, size_type n, size_type pos = 0) const;
     13 
     14 // Throws: out_of_range if pos > size().
     15 // Remarks: Let rlen be the smaller of n and size() - pos.
     16 // Requires: [s, s+rlen) is a valid range.
     17 // Effects: Equivalent to std::copy_n(begin() + pos, rlen, s).
     18 // Returns: rlen.
     19 
     20 
     21 #include <experimental/string_view>
     22 #include <cassert>
     23 
     24 #include "test_macros.h"
     25 
     26 template<typename CharT>
     27 void test1 ( std::experimental::basic_string_view<CharT> sv, size_t n, size_t pos ) {
     28     const size_t rlen = std::min ( n, sv.size() - pos );
     29 
     30     CharT *dest1 = new CharT [rlen + 1];    dest1[rlen] = 0;
     31     CharT *dest2 = new CharT [rlen + 1];    dest2[rlen] = 0;
     32 
     33     if (pos > sv.size()) {
     34 #ifndef TEST_HAS_NO_EXCEPTIONS
     35         try {
     36             sv.copy(dest1, n, pos);
     37             assert(false);
     38         } catch (const std::out_of_range&) {
     39         } catch (...) {
     40             assert(false);
     41         }
     42 #endif
     43     } else {
     44         sv.copy(dest1, n, pos);
     45         std::copy_n(sv.begin() + pos, rlen, dest2);
     46         for ( size_t i = 0; i <= rlen; ++i )
     47             assert ( dest1[i] == dest2[i] );
     48     }
     49     delete [] dest1;
     50     delete [] dest2;
     51 }
     52 
     53 
     54 template<typename CharT>
     55 void test ( const CharT *s ) {
     56     typedef std::experimental::basic_string_view<CharT> string_view_t;
     57 
     58     string_view_t sv1 ( s );
     59 
     60     test1(sv1,  0, 0);
     61     test1(sv1,  1, 0);
     62     test1(sv1, 20, 0);
     63     test1(sv1, sv1.size(), 0);
     64     test1(sv1, 20, string_view_t::npos);
     65 
     66     test1(sv1,   0, 3);
     67     test1(sv1,   2, 3);
     68     test1(sv1, 100, 3);
     69     test1(sv1, 100, string_view_t::npos);
     70 
     71     test1(sv1, sv1.size(), string_view_t::npos);
     72 
     73     test1(sv1, sv1.size() + 1, 0);
     74     test1(sv1, sv1.size() + 1, 1);
     75     test1(sv1, sv1.size() + 1, string_view_t::npos);
     76 
     77 }
     78 
     79 int main () {
     80     test ( "ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE" );
     81     test ( "ABCDE");
     82     test ( "a" );
     83     test ( "" );
     84 
     85     test ( L"ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE" );
     86     test ( L"ABCDE" );
     87     test ( L"a" );
     88     test ( L"" );
     89 
     90 #if TEST_STD_VER >= 11
     91     test ( u"ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE" );
     92     test ( u"ABCDE" );
     93     test ( u"a" );
     94     test ( u"" );
     95 
     96     test ( U"ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE" );
     97     test ( U"ABCDE" );
     98     test ( U"a" );
     99     test ( U"" );
    100 #endif
    101 }
    102