的boost ::變種，在分配

Question

共享PTR錯誤，我有以下要素：

#define TEMPLATE_PARAM boost::variant<int, const std::string&, const std::vector<std::string>&, const std::vector<int>&, const ITemplateLoop*, const std::vector<ITemplateLoop*>&> 

class PostParam 
{ 
... 
const std::string &getParam() const; 
}; 

class ParamContainer 
{ 
    std::map<std::string, TEMPLATE_PARAM> map_; 

    template <typename T> 
    void  insert(std::string key, const T & value) 
    { 
    map_[key] = value; 
    } 

public: 
    template<typename ... Args> 
    void  add(std::map<std::string, std::shared_ptr<PostParam>>& param, Args ... args) 
    { 
    for (const auto & key : param) 
     insert(key.first, key.second->getParam()); 
    if (sizeof ...(Args) > 0) 
     add(args...); 
    } 

我得到了很多編譯錯誤的，我不知道該怎麼粘貼在這裏

/usr/local/include/boost/detail/reference_content.hpp: In member function 'void boost::detail::variant::move_storage::internal_visit(T&, int) const [with T = boost::de tail::reference_content<const std::basic_string<char>&>]': 
/usr/local/include/boost/variant/detail/visitation_impl.hpp:130:9: instantiated from 'typename Visitor::result_type boost::detail::variant::visitation_impl_invoke_impl(int, Visitor&, VoidPtrCV, T*, mpl_::true_) [with Visitor = boost::detail::variant::move_storage, VoidPtrCV = void*, T = boost::detail::reference_content<const std::basic_string<char>&>, typename Visitor::result_type = void, mpl_::true_ = mpl_::bool_<true>]' 
/usr/local/include/boost/variant/detail/visitation_impl.hpp:173:9: instantiated from 'typename Visitor::result_type boost::detail::variant::visitation_impl_invoke(int, Visitor&, VoidPtrCV, T*, NoBackupFlag, int) [with Visitor=boost::detail::variant::move_storage, VoidPtrCV = void*, T = boost::detail::reference_content<const std::basic_string<char>&>, NoBackupFlag = boost::variant<int, const std::basic_string<char>&, const std::vector<std::basic_string<char> >&, const std::vector<int>&, const TemplateEngine::ITemplateLoop*, const std::vector<TemplateEngine::ITemplateLoop*>&, const PostParam&>::has_fallback_type_, typename Visitor::result_type = void]' 
/usr/local/include/boost/variant/detail/visitation_impl.hpp:260:1: instantiated from 'typename Visitor::result_type boost::detail::variant::visitation_impl(int, int, Visitor&, VoidPtrCV, mpl_::false_, NoBackupFlag, Which*, step0*) [with Which = mpl_::int_<0>, step0 = boost::detail::variant::visitation_impl_step<boost::mpl::l_iter< boost::mpl::l_item<mpl_::long_<7l>, int, boost::mpl::l_item<mpl_::long_<6l>, boost::detail::reference_content<const std::basic_string<char>&>, boost::mpl::l_item<mpl_: :long_<5l>, boost::detail::reference_content<const std::vector<std::basic_string<char> >&>, boost::mpl::l_item<mpl_::long_<4l>, boost::detail::reference_content<const std::vector<int>&>, boost::mpl::l_item<mpl_::long_<3l>, const TemplateEngine::ITemplateLoop*, boost::mpl::l_item<mpl_::long_<2l>, boost::detail::reference_content<const std::vector<TemplateEngine::ITemplateLoop*>&>, boost::mpl::l_item<mpl_::long_<1l>, boost::detail::reference_content<const PostParam&>, boost::mpl::l_end> > > > > > > >, boost::mpl::l_iter<boost::mpl::l_end> >, Visitor = boost::detail::variant::move_storage, VoidPtrCV = void*, NoBackupFlag = boost::variant<int, const std::basic_string<char>&, const std::vector<std::basic_string<char> >&, const std::vector<int>&, const TemplateEngine::ITemplateLoop*, const std::vector<TemplateEngine::ITemplateLoop*>&, const PostParam&>::has_fallback_type_, typename Visitor::result_type = void, mpl_::false_ = mpl_::bool_<false>]' 

我認爲這是我開始使用key.second-> getParam（）不只參數，但我無法找到一個解決方案

編輯

我已經改變了＃定義typedef的 所以錯誤消息

/home/django/cloaked-ninja/includes/TemplateEngine.hpp:67:7: instantiated from 'void TemplateEngine::ParamContainer::insert(std::string, const T&) [with T = std::basic_string<char>, std::string = std::basic_string<char>]' 
/home/django/cloaked-ninja/includes/TemplateEngine.hpp:94:2: instantiated from 'void TemplateEngine::ParamContainer::add(std::map<std::basic_string<char>, std::shared_ptr<PostParam> >&, Args ...) [with Args = {}]' 
/home/django/cloaked-ninja/src/Controller/ControllerPost.cpp:22:14: instantiated from here 
/usr/local/include/boost/detail/reference_content.hpp:62:24: error: 'boost::detail::reference_content<RefT>& boost::detail::reference_content<RefT>::operator=(const boost::detail::reference_content<RefT>&) [with RefT = const std::basic_string<char>&, boost::detail::reference_content<RefT> = boost::detail::reference_content<const std::basic_string<char>&>]' is private 
/usr/local/include/boost/variant/variant.hpp:583:9: error: within this context 
/usr/local/include/boost/detail/reference_content.hpp: In member function 'void boost::detail::variant::move_storage::internal_visit(T&, int) const [with T = boost::de tail::reference_content<const std::vector<std::basic_string<char> >&>]': 
/usr/local/include/boost/variant/detail/visitation_impl.hpp:130:9: instantiated from 'typename Visitor::result_type boost::detail::variant::visitation_impl_invoke_impl(int, Visitor&, VoidPtrCV, T*, mpl_::true_) [with Visitor = boost::detail::variant::move_storage, VoidPtrCV = void*, T = boost::detail::reference_content<const std::vector<std::basic_string<char> >&>, typename Visitor::result_type = void, mpl_::true_ = mpl_::bool_<true>]' 
/usr/local/include/boost/detail/reference_content.hpp: In member function 'void boost::detail::variant::move_storage::internal_visit(T&, int) const [with T = boost::detail::reference_content<const std::vector<std::basic_string<char> >&>]': 
/usr/local/include/boost/variant/detail/visitation_impl.hpp:130:9: instantiated from 'typename Visitor::result_type boost::detail::variant::visitation_impl_invoke_impl(int, Visitor&, VoidPtrCV, T*, mpl_::true_) [with Visitor = boost::detail::variant::move_storage, VoidPtrCV = void*, T = boost::detail::reference_content<const 
std::vector<std::basic_string<char> >&>, typename Visitor::result_type = void, mpl_::true_ = mpl_::bool_<true>]' 
/usr/local/include/boost/variant/detail/visitation_impl.hpp:173:9: instantiated from 'typename Visitor::result_type boost::detail::variant::visitation_impl_invoke(int, Visitor&, VoidPtrCV, T*, NoBackupFlag, int) [with Visitor = boost::detail::variant::move_storage, VoidPtrCV = void*, T = boost::detail::reference_content<const std::vector<std::basic_string<char> >&>, NoBackupFlag = boost::variant<int, const std::basic_string<char>&, const std::vector<std::basic_string<char> >&, const std::vector<int>&, const TemplateEngine::ITemplateLoop*, const std::vector<TemplateEngine::ITemplateLoop*>&>::has_fallback_type_, typename Visitor::result_type = void]' 
/usr/local/include/boost/variant/detail/visitation_impl.hpp:260:1: instantiated from 'typename Visitor::result_type boost::detail::variant::visitation_impl(int, int, Visitor&, VoidPtrCV, mpl_::false_, NoBackupFlag, Which*, step0*) [with Which = mpl_::int_<0>, step0 = boost::detail::variant::visitation_impl_step<boost::mpl::l_iter<boost::mpl::l_item<mpl_::long_<6l>, int, boost::mpl::l_item<mpl_::long_<5l>, boost::detail::reference_content<const std::basic_string<char>&>, boost::mpl::l_item<mpl_::long_<4l>, boost::detail::reference_content<const std::vector<std::basic_string<char> >&>, boost::mpl::l_item<mpl_::long_<3l>, boost::detail::reference_content<const std::vector<int>&>, boost::mpl::l_item<mpl_::long_<2l>, const TemplateEngine::ITemplateLoop*, boost::mpl::l_item<mpl_::long_<1l>, boost::detail::reference_content<const std::vector<TemplateEngine::ITemplateLoop*>&>, boost::mpl::l_end> > > > > > >, boost::mpl::l_iter<boost::mpl::l_end> >, Visitor = boost::detail::variant::move_storage, VoidPtrCV = void*, NoBackupFlag = boost::variant<int, const std::basic_string<char>&, const std::vector<std::basic_string<char> >&, const std::vector<int>&, const TemplateEngine::ITemplateLoop*, const std::vector<TemplateEngine::ITemplateLoop*>&>::has_fallback_type_, typename Visitor::result_type = void, mpl_::false_ = mpl_::bool_<false>]' 

EDIT2

我剛纔已經改變了的#define以下的typedef和它現在的工作：

typedef boost::variant<int, const std::string*, const std::vector<std::string>*, const std::vector<int>*, const ITemplateLoop*, const std::vector<ITemplateLoop*>*> TEMPLATE_PARAM; 

Answer 1

如果我是不完全錯誤，問題在於您的變體聲明。 boost::variant不能取值爲const &，因爲數據的副本是必需的。

這裏是一個最小的工作例如：

#include <boost/variant.hpp> 
#include <string> 
#include <map> 

struct foo 
{ 
    typedef boost::variant<int, std::string> variant; 
    std::map<std::string, variant> map; 

    template <typename T> 
    void insert(std::string const & key, T const & value) 
    { 
     map[key] = value; 
    } 
}; 

int main() 
{ 
    foo f; 
    f.insert("test", "foo"); 
    return 0; 
}