boost::property_tree 编译错误（错误 C2061：语法错误：标识符“p”）

Question

我正在努力编译一些利用 boost 属性树的代码。我正在使用 Visual Studio 2010。

如果我尽可能简化代码以重现错误，代码如下所示...

#include "AppleiTunesLibraryImporter.h"
#include <boost/property_tree/xml_parser.hpp>
#include <boost/property_tree/ptree.hpp>
using namespace boost::property_tree;

AppleiTunesLibraryImporter::AppleiTunesLibraryImporter(){}
AppleiTunesLibraryImporter::~AppleiTunesLibraryImporter(){}

bool AppleiTunesLibraryImporter::ImportData( std::string itunes_library_xml_path )
{
    ptree pt;
    xml_parser::read_xml( itunes_library_xml_path.c_str(), pt, xml_parser::no_comments | xml_parser::trim_whitespace);
    return true;
}

...完整的错误如下...

1>  AppleiTunesLibraryImporter.cpp
1>c:\<path to my file>\thirdparty\boost\boost-1.47.0\boost/detail/allocator_utilities.hpp(178): error C2061: syntax error : identifier 'p'
1>          c:\<path to my file>\thirdparty\boost\boost-1.47.0\boost/multi_index/detail/index_base.hpp(88) : see reference to function template instantiation 'void boost::detail::allocator::construct<T>(void *,const Type &)' being compiled
1>          with
1>          [
1>              T=std::pair<const std::string,boost::property_tree::basic_ptree<std::string,std::string>>,
1>              Type=std::pair<const std::string,boost::property_tree::basic_ptree<std::string,std::string>>
1>          ]
1>          c:\<path to my file>\thirdparty\boost\boost-1.47.0\boost/multi_index/detail/index_base.hpp(87) : while compiling class template member function 'boost::multi_index::detail::index_node_base<Value,Allocator> *boost::multi_index::detail::index_base<Value,IndexSpecifierList,Allocator>::insert_(const std::pair<_Ty1,_Ty2> &,boost::multi_index::detail::index_node_base<Value,Allocator> *)'
1>          with
1>          [
1>              Value=std::pair<const std::string,boost::property_tree::basic_ptree<std::string,std::string>>,
1>              Allocator=std::allocator<std::pair<const std::string,boost::property_tree::basic_ptree<std::string,std::string>>>,
1>              IndexSpecifierList=boost::multi_index::indexed_by<boost::multi_index::sequenced<>,boost::multi_index::ordered_non_unique<boost::multi_index::tag<boost::property_tree::basic_ptree<std::string,std::string>::subs::by_name>,boost::multi_index::member_offset<std::pair<const std::string,boost::property_tree::basic_ptree<std::string,std::string>>,const std::basic_string<char,std::char_traits<char>,std::allocator<char>>,0>,std::less<std::string>>>,
1>              _Ty1=const std::string,
1>              _Ty2=boost::property_tree::basic_ptree<std::string,std::string>
1>          ]
1>          c:\<path to my file>\thirdparty\boost\boost-1.47.0\boost/multi_index/ordered_index.hpp(119) : see reference to class template instantiation 'boost::multi_index::detail::index_base<Value,IndexSpecifierList,Allocator>' being compiled
1>          with
1>          [
1>              Value=std::pair<const std::string,boost::property_tree::basic_ptree<std::string,std::string>>,
1>              IndexSpecifierList=boost::multi_index::indexed_by<boost::multi_index::sequenced<>,boost::multi_index::ordered_non_unique<boost::multi_index::tag<boost::property_tree::basic_ptree<std::string,std::string>::subs::by_name>,boost::multi_index::member_offset<std::pair<const std::string,boost::property_tree::basic_ptree<std::string,std::string>>,const std::basic_string<char,std::char_traits<char>,std::allocator<char>>,0>,std::less<std::string>>>,
1>              Allocator=std::allocator<std::pair<const std::string,boost::property_tree::basic_ptree<std::string,std::string>>>
1>          ]
1>          c:\<path to my file>\thirdparty\boost\boost-1.47.0\boost/multi_index/sequenced_index.hpp(77) : see reference to class template instantiation 'boost::multi_index::detail::ordered_index<KeyFromValue,Compare,SuperMeta,TagList,Category>' being compiled
1>          with
1>          [
1>              KeyFromValue=boost::multi_index::member_offset<std::pair<const std::string,boost::property_tree::basic_ptree<std::string,std::string>>,const std::basic_string<char,std::char_traits<char>,std::allocator<char>>,0>,
1>              Compare=std::less<std::string>,
1>              SuperMeta=boost::multi_index::detail::nth_layer<2,std::pair<const std::string,boost::property_tree::basic_ptree<std::string,std::string>>,boost::multi_index::indexed_by<boost::multi_index::sequenced<>,boost::multi_index::ordered_non_unique<boost::multi_index::tag<boost::property_tree::basic_ptree<std::string,std::string>::subs::by_name>,boost::multi_index::member_offset<std::pair<const std::string,boost::property_tree::basic_ptree<std::string,std::string>>,const std::basic_string<char,std::char_traits<char>,std::allocator<char>>,0>,std::less<std::string>>>,std::allocator<std::pair<const std::string,boost::property_tree::basic_ptree<std::string,std::string>>>>,
1>              TagList=boost::mpl::vector1<boost::property_tree::basic_ptree<std::string,std::string>::subs::by_name>,
1>              Category=boost::multi_index::detail::ordered_non_unique_tag
1>          ]
1>          c:\<path to my file>\thirdparty\boost\boost-1.47.0\boost/multi_index_container.hpp(89) : see reference to class template instantiation 'boost::multi_index::detail::sequenced_index<SuperMeta,TagList>' being compiled
1>          with
1>          [
1>              SuperMeta=boost::multi_index::detail::nth_layer<1,std::pair<const std::string,boost::property_tree::basic_ptree<std::string,std::string>>,boost::multi_index::indexed_by<boost::multi_index::sequenced<>,boost::multi_index::ordered_non_unique<boost::multi_index::tag<boost::property_tree::basic_ptree<std::string,std::string>::subs::by_name>,boost::multi_index::member_offset<std::pair<const std::string,boost::property_tree::basic_ptree<std::string,std::string>>,const std::basic_string<char,std::char_traits<char>,std::allocator<char>>,0>,std::less<std::string>>>,std::allocator<std::pair<const std::string,boost::property_tree::basic_ptree<std::string,std::string>>>>,
1>              TagList=boost::mpl::vector0<boost::mpl::na>
1>          ]
1>          c:\<path to my file>\thirdparty\boost\boost-1.47.0\boost/property_tree/detail/ptree_implementation.hpp(59) : see reference to class template instantiation 'boost::multi_index::multi_index_container<Value,IndexSpecifierList>' being compiled
1>          with
1>          [
1>              Value=std::pair<const std::string,boost::property_tree::basic_ptree<std::string,std::string>>,
1>              IndexSpecifierList=boost::multi_index::indexed_by<boost::multi_index::sequenced<>,boost::multi_index::ordered_non_unique<boost::multi_index::tag<boost::property_tree::basic_ptree<std::string,std::string>::subs::by_name>,boost::multi_index::member_offset<std::pair<const std::string,boost::property_tree::basic_ptree<std::string,std::string>>,const std::basic_string<char,std::char_traits<char>,std::allocator<char>>,0>,std::less<std::string>>>
1>          ]
1>          c:\<path to my file>\thirdparty\boost\boost-1.47.0\boost/property_tree/detail/ptree_implementation.hpp(182) : see reference to class template instantiation 'boost::property_tree::basic_ptree<Key,Data>::subs' being compiled
1>          with
1>          [
1>              Key=std::string,
1>              Data=std::string
1>          ]
1>          c:\<path to my file>\thirdparty\boost\boost-1.47.0\boost/property_tree/detail/ptree_implementation.hpp(182) : while compiling class template member function 'boost::property_tree::basic_ptree<Key,Data>::basic_ptree(void)'
1>          with
1>          [
1>              Key=std::string,
1>              Data=std::string
1>          ]
1>          ..\..\..\common\Source\AppleiTunesImporter\AppleiTunesLibraryImporter.cpp(24) : see reference to class template instantiation 'boost::property_tree::basic_ptree<Key,Data>' being compiled
1>          with
1>          [
1>              Key=std::string,
1>              Data=std::string
1>          ]

对我来说，我的 ApplieiTunesLibraryImporter.cpp 文件的第 24 行只是

ptree pt;

所以，编译器不喜欢我使用它。当我使用类似的东西时，我会遇到类似的错误

ptree::const_assoc_iterator assoc_iter;

但上面的代码是最简单的，我可以让错误发生。

导致编译错误的 boost 文件 (allocator_utilities.hpp) 中的代码如下所示，但对我来说很神秘。

/* allocator-independent versions of construct and destroy */

template<typename Type>
void construct(void* p,const Type& t)
{
  new (p) Type(t);
}

如果有人想尝试重现，这里是 .h 代码。

class AppleiTunesLibraryImporter
{
public:

    AppleiTunesLibraryImporter();
    virtual ~AppleiTunesLibraryImporter();

    bool ImportData( std::string itunes_library_xml_path );

};

这一切都变成了一些大脑融化，所以如果有人能对此有所了解，将不胜感激。

干杯。

Answer 1

我发现了问题。我正在处理的项目使用预编译的头文件，对于使用 boost 库的 .cpp 文件，我必须防止这种情况发生。换句话说，我必须右键单击 .cpp 文件才能开始...

属性 > 配置属性 > C/C++ > 预编译头文件

并将“预编译头”设置为“不使用预编译头” 另外，去...

属性 > 配置属性 > C/C++ > 高级

并将“强制包含文件”设置为空。

Answer 2

我有类似的问题，因为上述解决方案不适用于我。我必须找到根本原因。当我发现它让我烦恼时，我意识到这不是我第一次进行这项调查:)。所以这次没有错误并在这里记录根本原因:)。 我怀疑这与作者的根本原因相同。 所以在我的情况下，问题是在作为预编译的一部分包含的标头中的某个地方有

#define new .... // Debugging memory leaks in debug

这个来自预编译头文件的定义搞砸了新的布局。

因为抛弃这个定义是有问题的（“政治”原因）。在我的情况下我能找到的最好方法

#pragma push_macro("new")
#undef new
#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/info_parser.hpp>
#pragma pop_macro("new")