在旧版本的 boost 中使用 recursive_directory_iterator？

【问题标题】：Using recursive_directory_iterator in an old version of boost?在旧版本的 boost 中使用 recursive_directory_iterator？
【发布时间】：2018-02-09 12:52:17
【问题描述】：

我需要递归遍历一个目录；我从 SO 上的另一个线程获得了一个非常好的功能；为我的目的稍微调整了一下，它在带有 boost 1.62 和 clang 的 Mac 上完美运行。

但是，我们使用的是 SemaphoreCI（基于 ubuntu 14.04 LTS 和 boost 1.54），我无法在这些条件下编译它。

#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.");
        }
    }
}

这是我遇到的错误，

海合会：

/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

叮当声：

/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

【问题讨论】：

  • 调试正在检查运行时行为。修复编译器错误是故障排除。

标签： c++ ubuntu boost iterator filesystems


【解决方案1】：

当时，迭代器没有对范围概念进行建模。因此，只需创建自己的范围：

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

看Live On GCC 4.8 and Boost 1.54

【讨论】：

  • 我在发布它一段时间后发现了它。尽管如此，这就是答案。我还必须将 .path() 更改为 ->path() 才能正常工作。最终在预处理器宏下实现这些更改，检查正在使用哪个版本的 boost。
  • 首先是ok to post your own answers（节省别人的时间）！其次，您不必必须更改为使用原始迭代器，正如我的现场示例清楚地表明的那样。当然，如果您的编译器没有（启用）c++11，那么您将不得不：c++03 与 c++11
  • 最后，不要在预处理宏下切换？代码的 boost 1.54/c++03 版本在以后的编译器下运行良好。避免不必要的复杂性并避免它带来的错误。
  • 还不错；我认为我们很可能迟早会离开这个特定的构建环境。感谢您的帮助！
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