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Add WG21 filesystem namespace path view working example.
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/* Demonstration that path_view overloads work as expected for WG21 | ||
(C) 2024 Niall Douglas <http://www.nedproductions.biz/> (2 commits) | ||
File Created: Nov 2024 | ||
Licensed under the Apache License, Version 2.0 (the "License"); | ||
you may not use this file except in compliance with the License. | ||
You may obtain a copy of the License in the accompanying file | ||
Licence.txt or at | ||
http://www.apache.org/licenses/LICENSE-2.0 | ||
Unless required by applicable law or agreed to in writing, software | ||
distributed under the License is distributed on an "AS IS" BASIS, | ||
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
See the License for the specific language governing permissions and | ||
limitations under the License. | ||
Distributed under the Boost Software License, Version 1.0. | ||
(See accompanying file Licence.txt or copy at | ||
http://www.boost.org/LICENSE_1_0.txt) | ||
*/ | ||
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#include "../include/llfio.hpp" | ||
#include "llfio/v2.0/path_view.hpp" | ||
#include "quickcpplib/string_view.hpp" | ||
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#if __cplusplus >= 202000L || _HAS_CXX20 | ||
#include <filesystem> | ||
#include <iostream> | ||
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namespace llfio = LLFIO_V2_NAMESPACE; | ||
namespace fs = llfio::filesystem; | ||
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namespace std_filesystem | ||
{ | ||
using llfio::path_view; | ||
template <class T> using basic_string_view = llfio::basic_string_view<T>; | ||
template <class T> using span = llfio::span<T>; | ||
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// Exposition type path-view-like, except made concrete here | ||
struct path_view_like : public path_view | ||
{ | ||
path_view_like(path_view_component p, | ||
format fmt = path_view::auto_format) noexcept | ||
: path_view(p, fmt) | ||
{ | ||
} | ||
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template <class CharT> | ||
constexpr path_view_like(const CharT *b, size_type l, enum termination zt, | ||
format fmt = path_view::auto_format) noexcept | ||
: path_view(b, l, zt, fmt) | ||
{ | ||
} | ||
constexpr path_view_like(const byte *b, size_type l, | ||
enum termination zt) noexcept | ||
: path_view(b, l, zt) | ||
{ | ||
} | ||
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template <class CharT> | ||
constexpr path_view_like(basic_string_view<CharT> b, enum termination zt, | ||
format fmt = path_view::auto_format) noexcept | ||
: path_view(b, zt, fmt) | ||
{ | ||
} | ||
constexpr path_view_like(span<const byte> b, enum termination zt) noexcept | ||
: path_view(b, zt) | ||
{ | ||
} | ||
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template <class It, class End> | ||
constexpr path_view_like(It b, End e, enum termination zt, | ||
format fmt = path_view::auto_format) noexcept | ||
: path_view(b, e, zt, fmt) | ||
{ | ||
} | ||
template <class It, class End> | ||
constexpr path_view_like(It b, End e, enum termination zt) noexcept | ||
: path_view(b, e, zt) | ||
{ | ||
} | ||
}; | ||
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// Emulate future std::path | ||
class path : public fs::path | ||
{ | ||
using _base = fs::path; | ||
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public: | ||
using _base::_base; | ||
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explicit path(path_view_like pv) | ||
: _base(pv.path()) | ||
{ | ||
} | ||
}; | ||
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bool equivalent(const path &p1, const path &p2); | ||
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bool equivalent(path_view_like p1, path_view_like p2); | ||
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bool equivalent(path_view_like p1, const path &p2) | ||
{ | ||
return equivalent(p1, path_view(p2)); | ||
} | ||
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bool equivalent(const path &p1, path_view_like p2) | ||
{ | ||
return equivalent(path_view(p1), p2); | ||
} | ||
} // namespace std_filesystem | ||
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static size_t path_overload, path_view_overload; | ||
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/************************ implementation ***************************/ | ||
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bool std_filesystem::equivalent(const path &p1, const path &p2) | ||
{ | ||
std::cout << "Calls path overload" << std::endl; | ||
path_overload++; | ||
return fs::equivalent(p1, p2); | ||
} | ||
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bool std_filesystem::equivalent(path_view_like p1, path_view_like p2) | ||
{ | ||
std::cout << "Calls path_view overload" << std::endl; | ||
path_view_overload++; | ||
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llfio::file_handle h1 = | ||
llfio::file_handle::file( | ||
{}, // base for lookup | ||
p1, // path fragment | ||
llfio::file_handle::mode::attr_read // open for attributes read | ||
) | ||
.value(); // throw exception if it fails | ||
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llfio::file_handle h2 = | ||
llfio::file_handle::file( | ||
{}, // base for lookup | ||
p2, // path fragment | ||
llfio::file_handle::mode::attr_read // open for attributes read | ||
) | ||
.value(); // throw exception if it fails | ||
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// If unique ids are identical, they are the same inode | ||
return h1.unique_id() == h2.unique_id(); | ||
} | ||
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/************************ test ***************************/ | ||
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int main() | ||
{ | ||
auto temp_file = llfio::file_handle::temp_file().value(); | ||
std_filesystem::path temp_file_path(temp_file.current_path().value()); | ||
auto temp_file_path_view = llfio::path_view(temp_file_path); | ||
std::basic_string_view<fs::path::value_type> temp_file_string_view( | ||
temp_file_path.native()); | ||
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std::cout << "equivalent(path, path): "; | ||
if(!std_filesystem::equivalent(temp_file_path, temp_file_path)) | ||
{ | ||
abort(); | ||
} | ||
if(path_overload != 1 || path_view_overload != 0) | ||
{ | ||
abort(); | ||
} | ||
std::cout << "equivalent(path_view, path_view): "; | ||
if(!std_filesystem::equivalent(temp_file_path_view, temp_file_path_view)) | ||
{ | ||
abort(); | ||
} | ||
if(path_overload != 1 || path_view_overload != 1) | ||
{ | ||
abort(); | ||
} | ||
std::cout << "equivalent(path, path_view): "; | ||
if(!std_filesystem::equivalent(temp_file_path, temp_file_path_view)) | ||
{ | ||
abort(); | ||
} | ||
if(path_overload != 1 || path_view_overload != 2) | ||
{ | ||
abort(); | ||
} | ||
std::cout << "equivalent(c_str, path): "; | ||
if(!std_filesystem::equivalent(temp_file_path.c_str(), temp_file_path)) | ||
{ | ||
abort(); | ||
} | ||
if(path_overload != 2 || path_view_overload != 2) | ||
{ | ||
abort(); | ||
} | ||
std::cout << "equivalent(c_str, path_view): "; | ||
if(!std_filesystem::equivalent(temp_file_path.c_str(), temp_file_path_view)) | ||
{ | ||
abort(); | ||
} | ||
if(path_overload != 2 || path_view_overload != 3) | ||
{ | ||
abort(); | ||
} | ||
std::cout << "equivalent(c_str, c_str): "; | ||
if(!std_filesystem::equivalent(temp_file_path.c_str(), | ||
temp_file_path.c_str())) | ||
{ | ||
abort(); | ||
} | ||
if(path_overload != 3 || path_view_overload != 3) | ||
{ | ||
abort(); | ||
} | ||
std::cout << "equivalent(string_view, path): "; | ||
if(!std_filesystem::equivalent(temp_file_string_view, temp_file_path)) | ||
{ | ||
abort(); | ||
} | ||
if(path_overload != 4 || path_view_overload != 3) | ||
{ | ||
abort(); | ||
} | ||
std::cout << "equivalent({string_view, termination}, path): "; | ||
if(!std_filesystem::equivalent( | ||
{temp_file_string_view, std_filesystem::path_view::zero_terminated}, | ||
temp_file_path)) | ||
{ | ||
abort(); | ||
} | ||
if(path_overload != 4 || path_view_overload != 4) | ||
{ | ||
abort(); | ||
} | ||
std::cout << "equivalent({c_str, length, termination}, path): "; | ||
if(!std_filesystem::equivalent({temp_file_string_view.data(), | ||
temp_file_string_view.size(), | ||
std_filesystem::path_view::zero_terminated}, | ||
temp_file_path)) | ||
{ | ||
abort(); | ||
} | ||
if(path_overload != 4 || path_view_overload != 5) | ||
{ | ||
abort(); | ||
} | ||
return 0; | ||
} | ||
#else | ||
int main() | ||
{ | ||
return 0; | ||
} | ||
#endif |
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// Note the second line of this file must ALWAYS be the git SHA, third line ALWAYS the git SHA update time | ||
#define LLFIO_PREVIOUS_COMMIT_REF c123eb0e802bb8223356e9940db86179f8ee74b7 | ||
#define LLFIO_PREVIOUS_COMMIT_DATE "2024-11-06 00:30:56 +00:00" | ||
#define LLFIO_PREVIOUS_COMMIT_UNIQUE c123eb0e | ||
#define LLFIO_PREVIOUS_COMMIT_REF 4872b85f61ca15454f852cc8f40092daa483ee5e | ||
#define LLFIO_PREVIOUS_COMMIT_DATE "2024-11-06 09:04:25 +00:00" | ||
#define LLFIO_PREVIOUS_COMMIT_UNIQUE 4872b85f |
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