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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 // <fstream>
     11 
     12 // template <class charT, class traits = char_traits<charT> >
     13 // class basic_fstream
     14 
     15 // void open(const string& s, ios_base::openmode mode = ios_base::in|ios_base::out);
     16 
     17 #include <fstream>
     18 #include <cassert>
     19 #include "platform_support.h"
     20 
     21 int main()
     22 {
     23     std::string temp = get_temp_file_name();
     24     {
     25         std::fstream fs;
     26         assert(!fs.is_open());
     27         fs.open(temp, std::ios_base::in | std::ios_base::out
     28                                                      | std::ios_base::trunc);
     29         assert(fs.is_open());
     30         double x = 0;
     31         fs << 3.25;
     32         fs.seekg(0);
     33         fs >> x;
     34         assert(x == 3.25);
     35     }
     36     std::remove(temp.c_str());
     37     {
     38         std::wfstream fs;
     39         assert(!fs.is_open());
     40         fs.open(temp, std::ios_base::in | std::ios_base::out
     41                                                      | std::ios_base::trunc);
     42         assert(fs.is_open());
     43         double x = 0;
     44         fs << 3.25;
     45         fs.seekg(0);
     46         fs >> x;
     47         assert(x == 3.25);
     48     }
     49     std::remove(temp.c_str());
     50 }
     51