libstdc++-v3/testsuite/21_strings/char_traits/requirements/char/1.cc

   1 // 1999-06-03 bkoz
   2
   3 // Copyright (C) 1999-2020 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20 // 21.1.1 Characher traits requirements
  21
  22 #include <string>
  23 #include <testsuite_hooks.h>
  24
  25 void test01(void)
  26 {
  27   const std::string str_01("zuma beach");
  28   const std::string str_02("montara and ocean beach");
  29
  30   // 21.1.1 character traits requirements
  31
  32   // Key for decoding what function signatures really mean:
  33   // X        == char_traits<_CharT>
  34   // [c,d]    == _CharT
  35   // [p,q]    == const _CharT*
  36   // s        == _CharT*
  37   // [n,i,j]  == size_t
  38   // f        == X::int_type
  39   // pos      == X::pos_type
  40   // state    == X::state_type
  41
  42   // void X::assign(char c, char d)
  43   // assigns c = d;
  44   char c1 = 'z';
  45   char c2 = 'u';
  46   VERIFY( c1 != c2 );
  47   std::char_traits<char>::assign(c1,c2);
  48   VERIFY( c1 == 'u' );
  49
  50   // char* X::move(char* s, const char* p, size_t n)
  51   // for each i in [0,n) performs X::assign(s[i], p[i]). Copies
  52   // correctly even where p is in [s, s + n), and yields s.
  53   char array1[] = {'z', 'u', 'm', 'a', ' ', 'b', 'e', 'a', 'c', 'h',  0};
  54   const char str_lit1[] = "montara and ocean beach";
  55   const char str_lit2[] = "boracay, philippines";
  56   const int len1 = sizeof(str_lit1)/sizeof(char);
  57   const int len2 = sizeof(str_lit2)/sizeof(char);
  58   char array2[len1 + len2 - 1]; // two terminating chars
  59   std::char_traits<char>::copy(array2, str_lit2, len2);
  60
  61   VERIFY( str_lit1[0] == 'm' );
  62   c1 = array2[0];
  63   c2 = str_lit1[0];
  64   char c3 = array2[1];
  65   char c4 = str_lit1[1];
  66   std::char_traits<char>::move(array2, str_lit1, 0);
  67   VERIFY( array2[0] == c1 );
  68   VERIFY( str_lit1[0] == c2 );
  69   std::char_traits<char>::move(array2, str_lit1, 1);
  70   VERIFY( array2[0] == c2 );
  71   VERIFY( str_lit1[0] == c2 );
  72   VERIFY( array2[1] == c3 );
  73   VERIFY( str_lit1[1] == c4 );
  74   std::char_traits<char>::move(array2, str_lit1, 2);
  75   VERIFY( array2[0] == c2 );
  76   VERIFY( str_lit1[0] == c2 );
  77   VERIFY( array2[1] == c4 );
  78   VERIFY( str_lit1[1] == c4 );
  79
  80   char* pc1 = array1 + 1;
  81   c1 = pc1[0];
  82   c2 = array1[0];
  83   VERIFY( c1 != c2 );
  84   char* pc2 = std::char_traits<char>::move(array1, pc1, 0);
  85   c3 = pc1[0];
  86   c4 = array1[0];
  87   VERIFY( c1 == c3 );
  88   VERIFY( c2 == c4 );
  89   VERIFY( pc2 == array1 );
  90
  91   c1 = pc1[0];
  92   c2 = array1[0];
  93   char* pc3 = pc1;
  94   pc2 = std::char_traits<char>::move(array1, pc1, 10);
  95   c3 = pc1[0];
  96   c4 = array1[0];
  97   VERIFY( c1 != c3 ); // underlying char array changed.
  98   VERIFY( c4 != c3 );
  99   VERIFY( pc2 == array1 );
 100   VERIFY( pc3 == pc1 ); // but pointers o-tay
 101   c1 = *(str_01.data());
 102   c2 = array1[0];
 103   VERIFY( c1 != c2 );
 104 }
 105
 106 int main()
 107 {
 108   test01();
 109   return 0;
 110 }