Verwenden rekursive_directory_iterator in einer alten Version von Boost?

Question

Ich muss rekursiv durch ein Verzeichnis iterieren; Ich habe eine ziemlich gute Funktion dafür von einem anderen Thread hier auf SO bekommen; habe es nur ein kleines bisschen für meine Zwecke angepasst und es funktioniert perfekt auf Mac mit Boost 1.62 und clang.

Allerdings verwenden wir SemaphoreCI (basierend auf Ubuntu 14.04 LTS und Boost 1.54) und ich kann es einfach nicht unter diesen Bedingungen kompilieren.

#include <boost/algorithm/string/replace.hpp> 
#include <boost/filesystem.hpp> 
#include <boost/range.hpp> 
void copyDirectoryRecursively(const fs::path& sourceDir, const fs::path& destinationDir) 
{ 
    if (!fs::exists(sourceDir) || !fs::is_directory(sourceDir)) 
    { 
     throw std::runtime_error("Source directory " + sourceDir.string() + " does not exist or is not a directory"); 
    } 
    if (!fs::create_directory(destinationDir) && !fs::exists(destinationDir)) 
    { 
     throw std::runtime_error("Cannot create destination directory " + destinationDir.string()); 
    } 

    for (const auto& dirEnt : fs::recursive_directory_iterator{sourceDir}) 
    { 
     const auto& path = dirEnt.path(); 
     auto relativePathStr = path.string(); 
     boost::algorithm::replace_first(relativePathStr, sourceDir.string(), ""); 
     try { 
     if (!fs::is_directory(path)) { fs::copy_file(path, destinationDir/relativePathStr); } 
     else { fs::copy_directory(path, destinationDir/relativePathStr); } 
     } 
     catch (...) { 
     throw std::runtime_error("Cannot copy file " + path.string() + ", because it already exists in the destination folder."); 
     } 
    } 
} 

Hier ist der Fehler Ich erhalte,

GCC:

/home/runner/performous/game/fs.cc: In function ‘void copyDirectoryRecursively(const boost::filesystem::path&, const boost::filesystem::path&)’: 
/home/runner/performous/game/fs.cc:74:73: error: no matching function for call to ‘begin(boost::filesystem::recursive_directory_iterator&)’ 
    for (const auto& dirEnt : fs::recursive_directory_iterator{sourceDir}) 
                     ^
/home/runner/performous/game/fs.cc:74:73: note: candidates are: 
In file included from /usr/include/c++/4.8/string:51:0, 
       from /usr/include/c++/4.8/bits/locale_classes.h:40, 
       from /usr/include/boost/variant/variant.hpp:31, 
       from /home/runner/performous/game/configuration.hh:3, 
       from /home/runner/performous/game/fs.cc:2: 
/usr/include/c++/4.8/bits/range_access.h:87:5: note: template<class _Tp, long unsigned int _Nm> _Tp* std::begin(_Tp (&)[_Nm]) 
    ^
/usr/include/c++/4.8/bits/range_access.h:87:5: note: template argument deduction/substitution failed: 
       from /usr/include/c++/4.8/ostream:38, 
       from /usr/include/c++/4.8/bits/ios_base.h:41, 
    for (const auto& dirEnt : fs::recursive_directory_iterator{sourceDir}) 
       from /usr/include/c++/4.8/ios:42, 
       from /usr/include/boost/variant/detail/move.hpp:22, 
       from /usr/include/c++/4.8/iterator:64, 
       from /usr/include/boost/variant/detail/initializer.hpp:23, 
       from /usr/include/c++/4.8/iterator:64, 
       from /usr/include/c++/4.8/ostream:38, 
       from /usr/include/boost/variant.hpp:17, 
    begin(_Tp (&__arr)[_Nm]) 
       from /usr/include/boost/variant/detail/move.hpp:22, 
       from /usr/include/boost/variant/detail/initializer.hpp:23, 
       from /usr/include/boost/variant/variant.hpp:31, 
/home/runner/performous/game/fs.cc:74:73: note: mismatched types ‘_Tp [_Nm]’ and ‘boost::filesystem::recursive_directory_iterator’ 
       from /usr/include/boost/variant.hpp:17, 
                     ^
In file included from /usr/include/c++/4.8/string:51:0, 
       from /home/runner/performous/game/configuration.hh:3, 
       from /home/runner/performous/game/fs.cc:2: 
       from /usr/include/c++/4.8/bits/locale_classes.h:40, 
    begin(const _Container& __cont) -> decltype(__cont.begin()) 
/usr/include/c++/4.8/bits/range_access.h:58:5: note: template<class _Container> decltype (__cont.begin()) std::begin(const _Container&) 
/usr/include/c++/4.8/bits/range_access.h: In substitution of ‘template<class _Container> decltype (__cont.begin()) std::begin(const _Container&) [with _Container = boost::filesystem::recursive_directory_iterator]’: 
/usr/include/c++/4.8/bits/range_access.h:58:5: note: template argument deduction/substitution failed: 
       from /usr/include/c++/4.8/bits/ios_base.h:41, 
/home/runner/performous/game/fs.cc:74:73: required from here 
/usr/include/c++/4.8/bits/range_access.h:58:5: error: ‘const class boost::filesystem::recursive_directory_iterator’ has no member named ‘begin’ 
       from /usr/include/c++/4.8/ios:42, 
/usr/include/c++/4.8/bits/range_access.h:48:5: note: template<class _Container> decltype (__cont.begin()) std::begin(_Container&) 
    begin(_Container& __cont) -> decltype(__cont.begin()) 
    ^
/usr/include/c++/4.8/bits/range_access.h: In substitution of ‘template<class _Container> decltype (__cont.begin()) std::begin(_Container&) [with _Container = boost::filesystem::recursive_directory_iterator]’: 
/usr/include/c++/4.8/bits/range_access.h:48:5: error: ‘class boost::filesystem::recursive_directory_iterator’ has no member named ‘begin’ 
/home/runner/performous/game/fs.cc:74:73: required from here 
       from /usr/include/boost/config/no_tr1/utility.hpp:21, 
In file included from /usr/include/c++/4.8/utility:74:0, 
       from /usr/include/boost/config/select_stdlib_config.hpp:37, 
       from /usr/include/boost/config.hpp:40, 
    ^
       from /usr/include/boost/variant/detail/config.hpp:16, 
       from /usr/include/boost/variant/variant.hpp:23, 
       from /usr/include/boost/variant.hpp:17, 
       from /home/runner/performous/game/configuration.hh:3, 
/usr/include/c++/4.8/initializer_list:89:5: note: template<class _Tp> constexpr const _Tp* std::begin(std::initializer_list<_Tp>) 
       from /home/runner/performous/game/fs.cc:2: 
    begin(initializer_list<_Tp> __ils) noexcept 
    ^
/usr/include/c++/4.8/bits/range_access.h:48:5: note: template argument deduction/substitution failed: 
/usr/include/c++/4.8/initializer_list:89:5: note: template argument deduction/substitution failed: 
/home/runner/performous/game/fs.cc:74:73: note: ‘boost::filesystem::recursive_directory_iterator’ is not derived from ‘std::initializer_list<_Tp>’ 
    for (const auto& dirEnt : fs::recursive_directory_iterator{sourceDir}) 
/home/runner/performous/game/fs.cc:74:73: error: no matching function for call to ‘end(boost::filesystem::recursive_directory_iterator&)’ 
       from /usr/include/c++/4.8/bits/locale_classes.h:40, 
In file included from /usr/include/c++/4.8/string:51:0, 
/home/runner/performous/game/fs.cc:74:73: note: candidates are: 
       from /usr/include/c++/4.8/iterator:64, 
       from /usr/include/c++/4.8/bits/ios_base.h:41, 
                     ^
       from /usr/include/boost/variant/detail/move.hpp:22, 
       from /usr/include/c++/4.8/ostream:38, 
       from /usr/include/c++/4.8/ios:42, 
       from /usr/include/boost/variant/detail/initializer.hpp:23, 
       from /usr/include/boost/variant.hpp:17, 
       from /home/runner/performous/game/configuration.hh:3, 
       from /usr/include/boost/variant/variant.hpp:31, 
/usr/include/c++/4.8/bits/range_access.h:97:5: note: template<class _Tp, long unsigned int _Nm> _Tp* std::end(_Tp (&)[_Nm]) 
       from /home/runner/performous/game/fs.cc:2: 
/usr/include/c++/4.8/bits/range_access.h:97:5: note: template argument deduction/substitution failed: 
    ^
    end(_Tp (&__arr)[_Nm]) 
/home/runner/performous/game/fs.cc:74:73: note: mismatched types ‘_Tp [_Nm]’ and ‘boost::filesystem::recursive_directory_iterator’ 
    for (const auto& dirEnt : fs::recursive_directory_iterator{sourceDir}) 
                     ^
In file included from /usr/include/c++/4.8/string:51:0, 
       from /usr/include/c++/4.8/bits/locale_classes.h:40, 
       from /usr/include/c++/4.8/bits/ios_base.h:41, 
       from /usr/include/c++/4.8/ios:42, 
       from /usr/include/c++/4.8/ostream:38, 
       from /usr/include/c++/4.8/iterator:64, 
       from /usr/include/boost/variant/detail/move.hpp:22, 
       from /usr/include/boost/variant.hpp:17, 
       from /usr/include/boost/variant/variant.hpp:31, 
       from /usr/include/boost/variant/detail/initializer.hpp:23, 
       from /home/runner/performous/game/configuration.hh:3, 
       from /home/runner/performous/game/fs.cc:2: 
    ^
    end(const _Container& __cont) -> decltype(__cont.end()) 
/usr/include/c++/4.8/bits/range_access.h:78:5: note: template<class _Container> decltype (__cont.end()) std::end(const _Container&) 
/usr/include/c++/4.8/bits/range_access.h: In substitution of ‘template<class _Container> decltype (__cont.end()) std::end(const _Container&) [with _Container = boost::filesystem::recursive_directory_iterator]’: 
/usr/include/c++/4.8/bits/range_access.h:78:5: note: template argument deduction/substitution failed: 
/home/runner/performous/game/fs.cc:74:73: required from here 
/usr/include/c++/4.8/bits/range_access.h:78:5: error: ‘const class boost::filesystem::recursive_directory_iterator’ has no member named ‘end’ 
    end(_Container& __cont) -> decltype(__cont.end()) 
/usr/include/c++/4.8/bits/range_access.h:68:5: note: template<class _Container> decltype (__cont.end()) std::end(_Container&) 
/usr/include/c++/4.8/bits/range_access.h:68:5: note: template argument deduction/substitution failed: 

    ^/usr/include/c++/4.8/bits/range_access.h: In substitution of ‘template<class _Container> decltype (__cont.end()) std::end(_Container&) [with _Container = boost::filesystem::recursive_directory_iterator]’: 
/home/runner/performous/game/fs.cc:74:73: required from here 
/usr/include/c++/4.8/bits/range_access.h:68:5: error: ‘class boost::filesystem::recursive_directory_iterator’ has no member named ‘end’ 
In file included from /usr/include/c++/4.8/utility:74:0, 
       from /usr/include/boost/config/no_tr1/utility.hpp:21, 
       from /usr/include/boost/config/select_stdlib_config.hpp:37, 
       from /usr/include/boost/config.hpp:40, 
       from /usr/include/boost/variant/detail/config.hpp:16, 
       from /usr/include/boost/variant/variant.hpp:23, 
       from /usr/include/boost/variant.hpp:17, 
       from /home/runner/performous/game/configuration.hh:3, 
       from /home/runner/performous/game/fs.cc:2: 
/usr/include/c++/4.8/initializer_list:99:5: note: template<class _Tp> constexpr const _Tp* std::end(std::initializer_list<_Tp>) 
    end(initializer_list<_Tp> __ils) noexcept 
    ^
/usr/include/c++/4.8/initializer_list:99:5: note: template argument deduction/substitution failed: 
/home/runner/performous/game/fs.cc:74:73: note: ‘boost::filesystem::recursive_directory_iterator’ is not derived from ‘std::initializer_list<_Tp>’ 
    for (const auto& dirEnt : fs::recursive_directory_iterator{sourceDir}) 
                     ^
make[2]: *** [game/CMakeFiles/performous.dir/fs.cc.o] Error 1 
make[1]: *** [game/CMakeFiles/performous.dir/all] Error 2 
make: *** [all] Error 2 

Clang:

/home/runner/performous/game/fs.cc:74:29: error: invalid range expression of 
     type 'boost::filesystem::recursive_directory_iterator'; no viable 'begin' 
     function available 
    for (const auto& dirEnt : fs::recursive_directory_iterator{sourceDir}) 
          ^~~ 
1 error generated. 
make[2]: *** [game/CMakeFiles/performous.dir/fs.cc.o] Error 1 
make[1]: *** [game/CMakeFiles/performous.dir/all] Error 2 
make: *** [all] Error 2 

Answer 1

Damals der Iterator nicht den Bereich Konzept modellieren. Also, nur Ihre eigenen Bereich machen:

for (const auto& dirEnt : boost::make_iterator_range(fs::recursive_directory_iterator{sourceDir}, {})) { 

anzeigen Live On GCC 4.8 and Boost 1.54