1 //  boost/filesystem/exception.hpp  -----------------------------------------------------//
2 
3 //  Copyright Beman Dawes 2003
4 //  Copyright Andrey Semashev 2019
5 
6 //  Distributed under the Boost Software License, Version 1.0.
7 //  See http://www.boost.org/LICENSE_1_0.txt
8 
9 //  Library home page: http://www.boost.org/libs/filesystem
10 
11 #ifndef BOOST_FILESYSTEM3_EXCEPTION_HPP
12 #define BOOST_FILESYSTEM3_EXCEPTION_HPP
13 
14 #include <boost/config.hpp>
15 
16 # if defined( BOOST_NO_STD_WSTRING )
17 #   error Configuration not supported: Boost.Filesystem V3 and later requires std::wstring support
18 # endif
19 
20 #include <boost/filesystem/config.hpp>
21 #include <boost/filesystem/path.hpp>
22 
23 #include <string>
24 #include <boost/system/error_code.hpp>
25 #include <boost/system/system_error.hpp>
26 #include <boost/smart_ptr/intrusive_ptr.hpp>
27 #include <boost/smart_ptr/intrusive_ref_counter.hpp>
28 
29 #include <boost/config/abi_prefix.hpp> // must be the last #include
30 
31 #if defined(BOOST_MSVC)
32 #pragma warning(push)
33 // 'm_A' : class 'A' needs to have dll-interface to be used by clients of class 'B'
34 #pragma warning(disable: 4251)
35 // non dll-interface class 'A' used as base for dll-interface class 'B'
36 #pragma warning(disable: 4275)
37 #endif
38 
39 namespace boost {
40 namespace filesystem {
41 
42 //--------------------------------------------------------------------------------------//
43 //                                                                                      //
44 //                            class filesystem_error                                    //
45 //                                                                                      //
46 //--------------------------------------------------------------------------------------//
47 
48 class BOOST_SYMBOL_VISIBLE filesystem_error :
49   public system::system_error
50 {
51   // see http://www.boost.org/more/error_handling.html for design rationale
52 
53 public:
54   BOOST_FILESYSTEM_DECL filesystem_error(const std::string& what_arg, system::error_code ec);
55   BOOST_FILESYSTEM_DECL filesystem_error(const std::string& what_arg, const path& path1_arg, system::error_code ec);
56   BOOST_FILESYSTEM_DECL filesystem_error(const std::string& what_arg, const path& path1_arg, const path& path2_arg, system::error_code ec);
57 
58   BOOST_FILESYSTEM_DECL filesystem_error(filesystem_error const& that);
59   BOOST_FILESYSTEM_DECL filesystem_error& operator= (filesystem_error const& that);
60 
61   BOOST_FILESYSTEM_DECL ~filesystem_error() BOOST_NOEXCEPT_OR_NOTHROW;
62 
path1() const63   const path& path1() const BOOST_NOEXCEPT
64   {
65     return m_imp_ptr.get() ? m_imp_ptr->m_path1 : get_empty_path();
66   }
path2() const67   const path& path2() const BOOST_NOEXCEPT
68   {
69     return m_imp_ptr.get() ? m_imp_ptr->m_path2 : get_empty_path();
70   }
71 
72   BOOST_FILESYSTEM_DECL const char* what() const BOOST_NOEXCEPT_OR_NOTHROW BOOST_OVERRIDE;
73 
74 private:
75   BOOST_FILESYSTEM_DECL static const path& get_empty_path() BOOST_NOEXCEPT;
76 
77 private:
78   struct impl :
79     public boost::intrusive_ref_counter< impl >
80   {
81     path         m_path1; // may be empty()
82     path         m_path2; // may be empty()
83     std::string  m_what;  // not built until needed
84 
implboost::filesystem::filesystem_error::impl85     BOOST_DEFAULTED_FUNCTION(impl(), {})
86     explicit impl(path const& path1) : m_path1(path1) {}
implboost::filesystem::filesystem_error::impl87     impl(path const& path1, path const& path2) : m_path1(path1), m_path2(path2) {}
88   };
89   boost::intrusive_ptr< impl > m_imp_ptr;
90 };
91 
92 } // namespace filesystem
93 } // namespace boost
94 
95 #if defined(BOOST_MSVC)
96 #pragma warning(pop)
97 #endif
98 
99 #include <boost/config/abi_suffix.hpp> // pops abi_prefix.hpp pragmas
100 #endif // BOOST_FILESYSTEM3_EXCEPTION_HPP
101