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Added helper headers to dynamically select std::filesystem or ghc::filesystem into the namespace fs.
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Steffen Schuemann
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README.md
43
README.md
@ -143,6 +143,12 @@ without that switch ([see](https://blogs.msdn.microsoft.com/vcblog/2018/04/09/ms
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Be aware too, as a header-only library, it is not hiding the fact, that it
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uses system includes, so they "pollute" your global namespace.
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There is an additional header named `ghc/fs_std.hpp` that implements this
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dynamic selection of a filesystem implementation, that you can include
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instead of `ghc/filesystem.hpp` when you want std::filesystem where
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available and ghc::filesystem where not.
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### Using it as Forwarding-/Implementation-Header
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Alternatively, starting from v1.1.0 `ghc::filesystem` can also be used by
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@ -157,6 +163,43 @@ into a Windows-DLL, as a DLL interface with C++ standard templates in interfaces
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is a different beast. If someone is willing to give it a try, I might integrate
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a PR but currently working on that myself is not a priority.
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If you use the forwarding/implementation approach, you can still use the dynamic
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switching like this:
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```cpp
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#if defined(__cplusplus) && __cplusplus >= 201703L && defined(__has_include) && __has_include(<filesystem>)
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#include <filesystem>
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namespace fs {
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using namespace std::filesystem;
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using ifstream = std::ifstream;
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using ofstream = std::ofstream;
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using fstream = std::fstream;
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}
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#else
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#include <ghc/fs-fwd.hpp>
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namespace fs {
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using namespace ghc::filesystem;
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using ifstream = ghc::filesystem::ifstream;
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using ofstream = ghc::filesystem::ofstream;
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using fstream = ghc::filesystem::fstream;
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}
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#endif
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```
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and in the implementation hiding cpp, you might use (before any include that includes `ghc/fs_fwd.hpp`
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to take precedence:
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```cpp
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#if !(defined(__cplusplus) && __cplusplus >= 201703L && defined(__has_include) && __has_include(<filesystem>))
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#include <ghc/fs_impl.hpp>
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#endif
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```
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There are additional helper headers, named `ghc/fs_std_fwd.hpp` and `ghc/fs_std_impl.hpp`
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that use this technique, so you can simply include them if you want to dynamically select
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the filesystem implementation.
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### Git Submodule
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Starting from v1.1.0, it is possible to add `ghc::filesystem`
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59
include/ghc/fs_std.hpp
Normal file
59
include/ghc/fs_std.hpp
Normal file
@ -0,0 +1,59 @@
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//---------------------------------------------------------------------------------------
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//
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// ghc::filesystem - A C++17-like filesystem implementation for C++11/C++14
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//
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//---------------------------------------------------------------------------------------
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//
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// Copyright (c) 2018, Steffen Schümann <s.schuemann@pobox.com>
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without modification,
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// are permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice, this
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// list of conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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//
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// 3. Neither the name of the copyright holder nor the names of its contributors
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// may be used to endorse or promote products derived from this software without
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// specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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//---------------------------------------------------------------------------------------
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// fs_std.hpp - The dynamic switching header for that includes std::filesystem if detected
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// or ghc::filesystem if not, and makes the resulting API available in the
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// namespace fs.
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//---------------------------------------------------------------------------------------
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#ifndef GHC_FILESYSTEM_STD_H
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#if defined(__cplusplus) && __cplusplus >= 201703L && defined(__has_include) && __has_include(<filesystem>)
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#include <filesystem>
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namespace fs {
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using namespace std::filesystem;
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using ifstream = std::ifstream;
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using ofstream = std::ofstream;
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using fstream = std::fstream;
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}
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#else
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#include <ghc/filesystem.hpp>
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namespace fs {
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using namespace ghc::filesystem;
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using ifstream = ghc::filesystem::ifstream;
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using ofstream = ghc::filesystem::ofstream;
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using fstream = ghc::filesystem::fstream;
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}
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#endif
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#endif // GHC_FILESYSTEM_STD_H
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63
include/ghc/fs_std_fwd.hpp
Normal file
63
include/ghc/fs_std_fwd.hpp
Normal file
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//---------------------------------------------------------------------------------------
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//
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// ghc::filesystem - A C++17-like filesystem implementation for C++11/C++14
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//
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//---------------------------------------------------------------------------------------
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//
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// Copyright (c) 2018, Steffen Schümann <s.schuemann@pobox.com>
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without modification,
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// are permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice, this
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// list of conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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//
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// 3. Neither the name of the copyright holder nor the names of its contributors
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// may be used to endorse or promote products derived from this software without
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// specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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//---------------------------------------------------------------------------------------
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// fs_std_fwd.hpp - The forwarding header for the header/implementation seperated usage of
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// ghc::filesystem that uses std::filesystem if it detects it.
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// This file can be include at any place, where fs::filesystem api is needed while
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// not bleeding implementation details (e.g. system includes) into the global namespace,
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// as long as one cpp includes fs_std_impl.hpp to deliver the matching implementations.
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//---------------------------------------------------------------------------------------
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#ifndef GHC_FILESYSTEM_STD_FWD_H
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#define GHC_FILESYSTEM_STD_FWD_H
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#if defined(__cplusplus) && __cplusplus >= 201703L && defined(__has_include) && __has_include(<filesystem>)
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#include <filesystem>
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namespace fs {
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using namespace std::filesystem;
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using ifstream = std::ifstream;
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using ofstream = std::ofstream;
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using fstream = std::fstream;
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}
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#else
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#define GHC_FILESYSTEM_FWD
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#include <ghc/filesystem.hpp>
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namespace fs {
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using namespace ghc::filesystem;
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using ifstream = ghc::filesystem::ifstream;
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using ofstream = ghc::filesystem::ofstream;
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using fstream = ghc::filesystem::fstream;
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}
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#endif
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#endif // GHC_FILESYSTEM_STD_FWD_H
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46
include/ghc/fs_std_impl.hpp
Normal file
46
include/ghc/fs_std_impl.hpp
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@ -0,0 +1,46 @@
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//---------------------------------------------------------------------------------------
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//
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// ghc::filesystem - A C++17-like filesystem implementation for C++11/C++14
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//
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//---------------------------------------------------------------------------------------
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//
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// Copyright (c) 2018, Steffen Schümann <s.schuemann@pobox.com>
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without modification,
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// are permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice, this
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// list of conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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//
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// 3. Neither the name of the copyright holder nor the names of its contributors
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// may be used to endorse or promote products derived from this software without
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// specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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//---------------------------------------------------------------------------------------
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// fs_std_impl.hpp - The implementation header for the header/implementation seperated usage of
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// ghc::filesystem that does nothing if std::filesystem is detected.
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// This file can be used to hide the implementation of ghc::filesystem into a single cpp.
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// The cpp has to include this before including fs_std_fwd.hpp directly or via a different
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// header to work.
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//---------------------------------------------------------------------------------------
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#if !(defined(__cplusplus) && __cplusplus >= 201703L && defined(__has_include) && __has_include(<filesystem>))
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#define GHC_FILESYSTEM_IMPLEMENTATION
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#include <ghc/filesystem.hpp>
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#endif
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