libstdc++-v3/testsuite/21_strings/basic_string/capacity/char/1.cc

   1 // 1999-05-11 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 // 21.3.3 string capacity
  21
  22 #include <string>
  23 #include <testsuite_hooks.h>
  24
  25 void test01()
  26 {
  27   // POD types : resize, capacity, reserve
  28   std::string str01;
  29   typedef std::string::size_type size_type_s;
  30
  31   size_type_s sz01 = str01.capacity();
  32   str01.reserve(100);
  33   size_type_s sz02 = str01.capacity();
  34   VERIFY( sz02 >= sz01 );
  35   VERIFY( sz02 >= 100 );
  36   str01.reserve();
  37   sz01 = str01.capacity();
  38 #if _GLIBCXX_USE_CXX11_ABI
  39   VERIFY( sz01 < 100);
  40 #else
  41   VERIFY( sz01 == 0 );
  42 #endif
  43
  44   sz01 = str01.size() + 5;
  45   str01.resize(sz01);
  46   sz02 = str01.size();
  47   VERIFY( sz01 == sz02 );
  48
  49   sz01 = str01.size() - 5;
  50   str01.resize(sz01);
  51   sz02 = str01.size();
  52   VERIFY( sz01 == sz02 );
  53
  54   std::string str05(30, 'q');
  55   std::string str06 = str05;
  56   str05 = str06 + str05;
  57   VERIFY( str05.capacity() >= str05.size() );
  58   VERIFY( str06.capacity() >= str06.size() );
  59
  60   // POD types: size, length, max_size, clear(), empty()
  61   bool b01;
  62   std::string str011;
  63   b01 = str01.empty();
  64   VERIFY( b01 == true );
  65   sz01 = str01.size();
  66   sz02 = str01.length();
  67   VERIFY( sz01 == sz02 );
  68   str01.c_str();
  69   sz01 = str01.size();
  70   sz02 = str01.length();
  71   VERIFY( sz01 == sz02 );
  72
  73   sz01 = str01.length();
  74   str01.c_str();
  75   str011 = str01 +  "_addendum_";
  76   str01.c_str();
  77   sz02 = str01.length();
  78   VERIFY( sz01 == sz02 );
  79   sz02 = str011.length();
  80   VERIFY( sz02 > sz01 );
  81
  82   // trickster allocator issues involved with these:
  83   std::string str3 = "8-chars_8-chars_";
  84   std::string str4 = str3 + "7-chars";
  85
  86   sz01 = str01.size();
  87   sz02 = str01.max_size();
  88   VERIFY( sz02 >= sz01 );
  89
  90   sz01 = str01.size();
  91   str01.clear();
  92   b01 = str01.empty();
  93   VERIFY( b01 == true );
  94   sz02 = str01.size();
  95   VERIFY( sz01 >= sz02 );
  96 }
  97
  98 int main()
  99 {
 100   test01();
 101   return 0;
 102 }