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在舊版本的boost中使用recursive_directory_iterator？

2017-08-31 149 views
1

我需要遞歸遍歷一個目錄;我從另一個線程得到了一個非常好的函數，它適合我的目的只是一點點，它可以完美地在Mac上以boost 1.62和clang工作。然而，我們正在使用SemaphoreCI（基於Ubuntu 14.04 LTS和boost 1.54），並且我不能在這些條件下編譯它。在舊版本的boost中使用recursive_directory_iterator？

#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."); 
     } 
    } 
}

這裏是我得到的錯誤，

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

鏘：

/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

來源

2017-08-31 Gregorio Litenstein

+0

調試檢查運行時行爲。修復編譯器錯誤是故障排除。 – sehe

回答

1

那時候，迭代器沒有範圍概念模型。所以，只要讓自己的範圍：

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

看到它Live On GCC 4.8 and Boost 1.54

來源

2017-08-31 16:27:27 sehe

+0

我發佈了一段時間後我發現它。不過，這是答案。我還必須將.path（）更改爲 - > path（）才能正常工作。在預處理器宏下檢查升級的哪個版本正在使用中結束實施這些更改。 –

+0

首先，這是[確定發佈自己的答案]（https://stackoverflow.com/help/self-answer）（節省時間）！其次，你不需要改變使用原始迭代器，就像我現場的例子清楚地表明的那樣。當然，如果你的編譯器沒有（啓用）C++ 11，那麼你必須：[C++ 03]（https://wandbox.org/permlink/twrV5POAv5bSCoHF）與[C++ 11 ]（https://wandbox.org/permlink/6Jl2a1MWuBe5GKPW） – sehe

+0

最後，不要在預處理宏下切換？ boost 1.54/C++ 03版本的代碼在稍後的編譯器中工作正常。避免不必要的複雜性並避免它帶來的錯誤。 – sehe

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