A toolkit for working with phylogenetic data.
v0.24.0
output_stream.hpp
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1 #ifndef GENESIS_UTILS_IO_OUTPUT_STREAM_H_
2 #define GENESIS_UTILS_IO_OUTPUT_STREAM_H_
3 
4 /*
5  Genesis - A toolkit for working with phylogenetic data.
6  Copyright (C) 2014-2020 Lucas Czech and HITS gGmbH
7 
8  This program is free software: you can redistribute it and/or modify
9  it under the terms of the GNU General Public License as published by
10  the Free Software Foundation, either version 3 of the License, or
11  (at your option) any later version.
12 
13  This program is distributed in the hope that it will be useful,
14  but WITHOUT ANY WARRANTY; without even the implied warranty of
15  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16  GNU General Public License for more details.
17 
18  You should have received a copy of the GNU General Public License
19  along with this program. If not, see <http://www.gnu.org/licenses/>.
20 
21  Contact:
22  Lucas Czech <lucas.czech@h-its.org>
23  Exelixis Lab, Heidelberg Institute for Theoretical Studies
24  Schloss-Wolfsbrunnenweg 35, D-69118 Heidelberg, Germany
25 */
26 
37 
38 #include <fstream>
39 #include <sstream>
40 #include <stdexcept>
41 #include <string>
42 
43 namespace genesis {
44 namespace utils {
45 
46 // =================================================================================================
47 // Output Stream
48 // =================================================================================================
49 
68 inline void file_output_stream(
69  std::string const& filename,
70  std::ofstream& out_stream,
71  std::ios_base::openmode mode = std::ios_base::out
72 ) {
73  if( ! Options::get().allow_file_overwriting() && utils::file_exists( filename ) ) {
75  "File '" + filename + "' already exists. If you want to allow overwriting of existing "
76  "files, activate genesis::utils::Options::get().allow_file_overwriting() first.",
77  filename
78  );
79  }
80 
81  out_stream.open( filename, mode );
82  if( out_stream.fail() ) {
83  throw std::runtime_error( "Cannot write to file '" + filename + "'." );
84  }
85 }
86 
87 } // namespace utils
88 } // namespace genesis
89 
90 #endif // include guard
Exception class that is thrown if trying to write to an existing file.
Definition: exception.hpp:105
void file_output_stream(std::string const &filename, std::ofstream &out_stream, std::ios_base::openmode mode=std::ios_base::out)
Helper function to obtain an output stream to a file.
Container namespace for all symbols of genesis in order to keep them separate when used as a library...
bool file_exists(std::string const &filename)
Return true iff the file exists.
Definition: fs.cpp:78
Provides functions for accessing the file system.
static Options & get()
Returns a single instance of this class.
Definition: options.hpp:60